K20 Engine Control Module: Scan Tool Information
The engine control module scan tool data list contains all engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists and in some cases may appear more than once or in more than one data list in order to group certain related parameters together.
Use the engine scan tool data list only after the following is determined:
- The Diagnostic System Check - Vehicle is completed.
- No diagnostic trouble codes (DTCs)
- On-board diagnostics are functioning properly
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The engine scan tool data list represents values that may be seen on a normally running engine.
NOTE:
A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Engine Controls for engine diagnosis.
Engine Control Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off/Brake Pedal Released | |||
| 5 V Reference 1, 2, 3 or 4 | Ignition ON | 5 V | This parameter displays the voltage sensed on the 5 V reference circuits at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage. |
| 5 V Reference 1, 2, 3 or 4 Circuit Status | Ignition ON | OK | This parameter displays OK if there is no 5 V reference circuit condition. If the circuit is shorted to ground or shorted to B+, Fault is displayed. |
| A/C High Side Pressure Sensor | A/C OFF | 0.75 - 1.5 V* | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. *Varies with temperature and relative humidity. |
| A/C ON | 1.3 - 2.5 V* | ||
| A/C High Side Pressure Sensor | A/C OFF | 450 - 650 kPa* (65 - 95 (PSI)* | This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module. *Varies with temperature and relative humidity. |
| Engine Speed at 2 000 RPM | 994 - 2 350 kPa* (144 - 341 PSI)* | ||
| A/C Off for WOT | A/C ON | No | This parameter displays whether the control module is commanding the A/C compressor clutch relay OFF for WOT. |
| A/C Disable - A/C Pressure Out of Range | A/C ON | No | This parameter displays whether the A/C pressure is out of range for normal operation as determined by the control module. |
| A/C Compressor Clutch Relay Command | A/C ON | On | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
| A/C Request Signal | A/C ON | Yes | This parameter displays the state of the A/C request input to the control module from the heating, ventilation and air conditioning (HVAC) controls. |
| Accelerator Pedal Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP as calculated by the control module using the signals from the APP sensors. |
| Accelerator pedal fully actuated | 100% | ||
| Accelerator Pedal Position | - | % Varies | This parameter displays the angle of the APP as calculated by the control module if overspeed detected. |
| Air/Fuel Equivalence Ratio Command | - | Varies | This parameter displays the ratio of air to fuel as calculated by the control module based on various sensor inputs. The scan tool will display a lower air fuel ratio when a richer air to fuel mixture is commanded. The scan tool will display a higher air fuel ratio when a leaner air to fuel mixture is commanded. In closed loop operation the air fuel ratio should normally be approximately 14.7:1. |
| Ambient Air Temperature | - | °C (°F) Varies |
This parameter displays the surrounding air temperature, at any given altitude. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.88 - 1.08 V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 1 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 4.17 - 4.37 V | ||
| APP Sensor 1 Circuit Status | Ignition ON | OK Fault | APP Sensor 1 Out of Range indicates that the sensed accelerator pedal position 1 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 1 Learned Released Position | Ignition ON | Varies | This Parameter indicates the accelerator pedal sensor 1 signal at its minimum learned position (pedal released) as a percentage of its reference voltage. (The minimum learned position is automatically updated periodically as determined by the calibration. |
| APP Sensor 2 | Accelerator pedal not actuated | 0.39 - 0.59 V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 2 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 2.02 - 2.22 V | ||
| APP Sensor 2 Circuit Status | Ignition ON | OK Fault | APP Sensor 2 Out of Range indicates that the sensed accelerator pedal position 2 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 2 Learned Released Position | Ignition ON | Varies | This Parameter indicates the accelerator pedal sensor 2 signal at its minimum learned position (pedal released) as a percentage of its reference voltage. (The minimum learned position is automatically updated periodically as determined by the calibration. |
| APP Sensor 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the APP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond to different accelerator pedal positions. |
| APP Sensors | - | 0% | This parameter displays the average of the APP sensors as calculated by the throttle actuator control (TAC) module. The APP average is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| APP Sensor 1 Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP sensor 1 as calculated by the control module using the signal from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 100% | ||
| APP Sensor 2 Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP sensor 2 as calculated by the control module using the signal from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 100% | ||
| BARO | - | 65 - 104 kPa (8 - 16 PSI) - Varies with altitude | This parameter displays the barometric pressure (BARO). The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences. |
| Boost Pressure Sensor | - | 1.9 V | This parameter shows the turbocharger boost sensor voltage. |
| Boost Pressure Sensor | - | 82 - 110 kPa (12 - 16 PSI) | This parameter displays the turbocharger boost pressure inside the engine as calculated by the control module based on the signal from the Boost pressure sensor. |
| Calculated Air Flow | - | g/s Varies | This parameter displays the air flow of the engine as calculated by the control module. |
| Calculated BARO | - | 65 - 104 kPa (8 - 16 PSI) - Varies with altitude | This parameter shows the calculated barometric pressure as calculated by the control module. |
| Calculated Catalyst Temperature | - | °C (°F) Varies |
This parameter displays the catalyst converter temperature as calculated by the control module. |
| Calculated Engine Oil Temperature | - | °C (°F) Varies |
This parameter displays the temperature of the engine oil as calculated by the control module using various sensor inputs. The engine oil temperature calculated has a range of values indicating a low value when the oil temperature is low to a high value when the oil temperature is high. |
| Camshaft Position Active Counter | - | 0 - 255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the camshaft position sensors. |
| Camshaft Position Sensor | - | Engine Speed | This parameter displays the speed of the engine as calculated by the signal from the camshaft position sensor, shown in RPM. |
| Catalyst Monitor Not At Idle Test Conditions Met | - | Yes or No | This parameter displays the status of the catalyst monitor diagnostic. Off Idle Conditions Met indicates if the off idle conditions for the catalyst monitor diagnostic have been met. Once the Off Idle Conditions are met the vehicle can return to idle and allow the catalyst monitor diagnostic test to run. |
| Catalyst Monitor Test Counter | - | Counts | This parameter displays the number of iterations of the catalyst monitor diagnostic test that have been performed since a code clear (used to determine if a sufficient number of tests have run to report a passing condition). |
| Catalyst Monitor Test Result | - | Varies | This parameter displays the status of the catalyst monitor diagnostic. |
| Catalyst Monitor Test State | - | Varies | This parameter displays when the catalyst monitor diagnostic is actively running a test. This condition will only be true when the vehicle is at idle. |
| Cold Start Up | - | Varies | This parameter displays whether the engine meets the conditions for a cold startup during the present ignition cycle. The scan tool displays Yes when the conditions for a cold startup are met during this ignition cycle. The scan tool displays No when the conditions for a cold startup are not met during the present ignition cycle. Conditions for a cold startup require the coolant temperature and the intake air temperature to be below a predetermined temperature and within a certain range of each other. These conditions must occur after the engine was warmed up to a specific temperature during the previous ignition cycle. |
| Cooling Fan Relay 1 Command | - | Varies | This parameter displays the commanded state of the cooling fan relay 1 control circuit. The cooling fan relay 1 should be ON when the scan tool indicates the fan control relay 1 command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the fan control Relay 1 Command is OFF. |
| Cooling Fan Relay 2 Command | - | Varies | This parameter displays the commanded state of the cooling fan relay 2 control circuit. The cooling fan relay 2 should be ON when the scan tool indicates the fan control Relay 2 command is ON. The cooling fan relay 2 should be OFF when the scan tool indicates the fan control Relay 2 command is OFF. |
| CPP Learned Apply Position | - | V | This parameter displays the position learned for the clutch pedal position (CPP) sensor when the clutch pedal is fully applied during the associated learn procedure. |
| CPP Learned Release Position | - | Varies | This parameter displays the position learned for the clutch pedal position sensor when the clutch pedal is released. |
| CPP Sensor | - | % | This parameter displays the displacement of the clutch pedal (corrected and normalized based upon its learned released and fully applied positions), where 0% corresponds to the clutch pedal being released and 100% corresponds to the clutch pedal being fully applied. |
| CPP Sensor | - | Varies | This parameter displays the clutch pedal position sensor analog input as a percentage of its reference voltage. |
| Crankshaft Position Active Counter | - | 0 - 255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position sensor. |
| Crankshaft Position Resynchronization Counter | - | 0 Counts | This parameter displays the number of counts the control module resynchronizes with the crankshaft position sensor. |
| Crankshaft Position Sensor | - | Engine Speed | This parameter displays the engine speed as calculated by the control module using the signal from the crankshaft position sensor. |
| Crank Request Signal | Ignition switch not in the crank position | No | This parameter displays whether the ignition switch has been cycled to the crank position requesting the control module to activate the starter relay. |
| Ignition switch in the crank position | Yes | ||
| Cruise Control | Cruise Control ON | ON/OFF | This parameter displays the status of the cruise control system as determined by the control module. |
| Cruise Control Accelerate Switch | Cruise Control ON | Active/ Inactive/ Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the accelerate switch is pressed, the ECM detects a predetermined voltage value for this switch. |
| Cruise Control Cancel Switch | Cruise Control ON | Active/ Inactive/ Invalid | This parameter displays the status of the cruise control cancel switch. |
| Cruise Control Coast Switch | Cruise Control ON | Active/ Inactive/ Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the ECM detects a predetermined voltage value for the coast switch. |
| Cruise Control On/Off Switch | Cruise Control ON | ON/OFF | The engine control module (ECM) monitors the signal circuit of the cruise control switch. A closed switch is displayed as ON. |
| Cruise Control Resume Switch | Cruise Control ON | Active/ Inactive/ Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the resume switch is pressed, the ECM detects a predetermined voltage value for the resume switch. |
| Cruise Control Set Switch | Cruise Control ON | Active/ Inactive/ Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the ECM detects a predetermined voltage value for the set switch. |
| Current Gear | Transmission in P (Park)/ N (Neutral) | P/N | This parameter displays the transmission gear commanded by the transmission control module. |
| Transmission not in P (Park)/ N (Neutral) | Reverse/ 1st-5th | ||
| Current Gear When Engine Overspeed Detected | - | Varies | This parameter displays the current gear during an engine overspeed condition is detected. |
| Cycles of Misfire Data | - | Incrementing 0 - 100 Counts | This parameter displays the number of cylinder firing events recorded by the control module. |
| Cylinder 1 - 4 Current Misfire Counter | - | 0 Counts | The scan tool displays 0 - 255 Counts. This parameter displays the number of misfires that have been detected during the last 200 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all of the cylinders and in low numbers. |
| Cylinder 1 - 4 History Misfire Counter | - | 0 Counts | The scan tool displays 0 - 255 Counts. The misfire history counters display the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire DTC P0300 00 has become active. The misfire history counters will update every 200 cylinder firing events. |
| Cylinder 1 - 4 Injector Disabled - Misfire Detected | - | No | This parameter displays the status of the fuel injector driver by the control module. The scan tool will display YES if the fuel injector is being disabled due to a misfire detection. The scan tool will display NO if the fuel injector is not being disabled by the control module due to a misfire. |
| Cylinder 1 - 4 Knock Detected | - | NO | This parameter displays the status of each cylinder for knock detection by the control module. The scan tool will display YES if a knock condition has been detected related to that cylinder combustion event. The scan tool will display NO if there is no knock condition detected related to that cylinder combustion event. |
| Deceleration Fuel Cut-Off | - | Inactive | This parameter displays the status of the operating mode used to turn off the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned off the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally. |
| Desired Boost Pressure | - | 48 kPa (682 PSI) | This parameter displays the desired turbocharger boost pressure as determined by the control module. |
| Desired ECT | - | °C (°F) Varies |
This parameter displays the desired engine coolant temperature (ECT) in °C (°F). |
| Desired Exhaust Camshaft Position | - | 8 - 27° | This parameter displays the desired exhaust camshaft angle as commanded by the control module. The scan tool will display a higher value for more advanced exhaust valve timing, such as high engine load or speed conditions. The scan tool will display a lower value for less advance exhaust valve timing, such as at idle. |
| Desired Idle Speed | - | 600 - 950 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
| Desired Intake Camshaft Position | - | 8 - 15° | This parameter displays the desired intake camshaft angle as commanded by the control module. The scan tool will display a higher value for more advanced intake valve timing, such as high engine load or speed conditions. The scan tool will display a lower value for less advance intake valve timing, such as at idle. |
| Desired Intake Manifold Runner Control Valve Position | - | Closed | This parameter displays the desired intake manifold runner control valve position as commanded by the control module. |
| Desired Throttle Position | - | 5 - 15% | This parameter displays the desired throttle position angle as commanded by the control module. |
| Distance Since DTC Cleared | - | Varies | This parameter displays the distance accumulated since an emission diagnostic trouble code was cleared. The scan tool will display increasing distance as the vehicle is driven. |
| ECM Authentication Status | Ignition ON | Unknown / Incorrect / Negative Response / Valid | ECM Authentication Status indicates the result of the comparison between the last received immobilizer response and the expected response calculated into the ECM. |
| ECM Challenge Status | - | Invalid | This parameter displays the status of the ECM challenge |
| ECM Response Source | Ignition ON | Ignition Switch Start/Remote Vehicle Start/Exterior Power Take Off (PTO) Vehicle Start | ECM Response Source indicates the source used to calculate the ECM response. |
| ECT Sensor | - | -39 to +140°C (-38 to +284°F) Varies |
This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
| Engine Controls Ignition Relay Command | - | ON | This parameter displays the commanded state of the engine control ignition relay control circuit. The scan tool will display ON or OFF. ON indicates the engine control ignition relay control circuit is being grounded by the control module, allowing voltage to other control module circuits and systems. OFF indicates the engine control ignition relay is not being commanded ON by the control module. |
| Engine Controls Ignition Relay Feedback Signal | - | B+ | This parameter displays the voltage available at the engine control ignition relay pin of the control module. |
| Engine Coolant Thermostat Heater Command | - | OFF | This parameter displays the commanded state of the engine coolant thermostat heater. The scan tool will display ON or OFF |
| Engine Load | Engine Idling | 11 - 30% Varies |
This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors. |
| Engine speed at 2 500 RPM | 25 - 40% | ||
| Engine Off Time | Ignition Switch in the OFF Position | Varies | This parameter displays the amount of time that has elapsed since the engine was last cycled OFF. The scan tool displays the time in hours, minutes and seconds. The engine OFF time will reset to zero when the engine starts. |
| Engine Oil Life Remaining | Ignition ON | 0 - 100% | This parameter displays the percent of engine oil life remaining. The controller calculates the engine oil life by monitoring engine load, coolant temperature and engine speed. |
| Engine Oil Pressure Switch | - | OK | This parameter displays the state of the engine oil pressure as determined by the control module. The control module monitors the engine oil pressure switch to determine if the engine oil pressure is sufficient. The scan tool displays Low when the engine oil pressure is below a predetermined value. |
| Engine Oil Temperature When Engine Overspeed Detected | - | Varies | This parameter displays the temperature of the engine oil if overspeed detected. |
| Engine Overspeed | - | Not Present | This parameter displays the status if overspeed detected. |
| Engine Overspeed Counter | - | Varies | This parameter displays the status if overspeed detected. |
| Engine Run Time | Engine Operating | Varies | This parameter displays the time elapsed since the engine was started. The scan tool will display the time in hours, minutes and seconds. The engine run time will reset to zero when the engine stops running. |
| Engine Speed | Engine Cranking | Greater than 60 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position sensor. |
| Engine Idling | Approximately 650 - 950 RPM | ||
| Engine Speed When Engine Overspeed Detected | - | Varies | This parameter displays the speed of the engine crankshaft rotation stored if an engine overspeed is detected. |
| EVAP Purge Solenoid Valve Command | - | 10 - 20% | This parameter displays the on-time or duty cycle of the EVAP canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge. |
| Exhaust Camshaft Position Active Counter | - | Varies in Counts | This parameter displays an incrementing counter when the control module receives a signal from the exhaust camshaft position sensor. |
| Exhaust Camshaft Position | - | 2 - 8° | This parameter displays the retard position of the camshaft in degrees of camshaft rotation from the parked position. Zero indicates the camshaft is in the parked position. |
| Exhaust Camshaft Position Command | - | 45 - 75% | This parameter displays the commanded duty cycle for the exhaust camshaft as commanded by the control module. |
| Exhaust Camshaft Position Variance | - | 0° | This parameter indicates the difference between the actual camshaft angle and the desired camshaft angle. |
| Fuel Control Loop Status | - | Closed Loop | This parameter displays the state of the fuel control system as commanded by the control module. Closed loop operation indicates that the control module is controlling the fuel delivery based off the oxygen sensors input signal. In open loop operation the control module ignores the oxygen sensor input signal and bases the amount of fuel to be delivered on other sensor inputs. |
| Fuel Economy | Engine Idling | Liters per Hour | This Parameter displays the instant fuel consumption rate of the engine in liters per hour. |
| Fuel Enrichment - Hot Catalyst | - | No | This parameter displays if the control module is commanding catalyst converter protection. |
| Fuel Enrichment - Hot Coolant | - | Inactive | This parameter displays the status of the fuel delivery system. The scan tool will display Active if the fuel system is running in open loop due to a temperature condition. The scan tool will display Inactive if the fuel system is operating normally. |
| Fuel Level Sensor | - | Varies | This parameter displays the approximate fuel level in the fuel tank as a voltage. The control module calculates this level using the signal from the sensor used to monitor the fuel in the tank. The scan tool will display a low reading when the fuel level in the tank is near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full. |
| Fuel Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2 s | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
| Engine idling | On | ||
| Fuel Tank Rated Capacity | - | 70 L | This parameter displays the rated maximum quantity of fuel the fuel tank will hold. This is calibrated in the control module to match the vehicle. |
| Fuel Trim Memory Cell | - | Varies | This parameter displays the fuel trim cell number as calculated by the control module based on engine speed and load inputs. The scan tool will display a lower number as conditions are closer to idle and a higher number as conditions approach maximum engine speed and maximum load. |
| Fuel Trim Learn | - | Enabled | This parameter displays Enabled when conditions are appropriate for enabling long term fuel trim corrections. This indicates that the long term fuel trim is adapting continuing amounts of short term fuel trim. If the scan tool displays Disabled, then long term fuel trim will not respond to changes in short term fuel trim. |
| Fuel Trim System Test State | - | Monitoring | This parameter indicates the status of the Fuel Trim System Test. The scan tool will display Disabled, Enabled, Monitoring, Complete or Run Purge Test. |
| Generator F-Terminal Signal | - | 30 - 70% | This parameter indicates the generator field duty cycle as commanded by the voltage regulator or control module. The scan tool will display a higher value for a higher commanded generator output and a lower value for a lower commanded generator output. |
| Generator L-Terminal Signal Command | - | ON | This parameter displays the commanded state of the generator L-terminal output. |
| HO2S 1 or HO2S 2 | Ignition ON, Engine OFF | 50 - 900 mV | This parameter indicates the heated oxygen sensor (HO2S) sensor 1 or 2, output voltage as measured by the control module. The scan tool will display a higher value during a rich condition and a lower value during a lean condition. |
| Engine Operating | Varies | ||
| HO2S 1 or HO2S 2 Heater | - | 0.42 - 0.62 A | This parameter displays the amperage of the HO2S heater commanded by the control module. |
| HO2S 1 or HO2S 2 Heater Command | - | ON | This parameter displays the commanded state of the HO2S 1 or HO2S 2 heater circuit by the control module. The scan tool will display ON when the heater is commanded ON. The scan tool will display OFF when the heater is commanded OFF. |
| HO2S 1 or HO2S 2 Heater Command | - | 0 - 99% | This parameter displays the commanded state of the HO2S 1 or HO2S 2 heater by the control module. The scan tool will display a higher value as the heater command is increased and a lower value if the heater is not commanded ON. |
| IAT Sensor 1 | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
| IAT Sensor 2 | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the air after the turbocharger and the charge air cooler, before it enters the intake manifold. Intake air temp is used by the ECM to adjust fuel delivery and spark timing according to incoming air density. |
| Ignition 1 Signal | - | B+ | This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal. |
| Ignition Accessory Signal | - | ON | This parameter displays the state of the ignition accessory position input to the control module from the ignition switch. |
| Ignition Timing | - | -4 to +15° | This parameter displays the amount of spark advance the control module is commanding. The control module determines the desired advance. |
| Immobilizer Password Learn | Ignition ON | Enabled/Disabled | Learning Enabled indicates that learning of immobilizer code information is enabled. |
| Immobilizer Security Code Lockout Active Timer | Ignition ON | ms | This Parameter displays the time elapsed since the immobilizer security code lockout has been activated either due to a battery disconnect or an incorrect immobilizer security code being entered. |
| Immobilizer Security Code Programming Counter | Ignition ON | Counts | This Parameter displays the number of times a new immobilizer security code has been programmed through secure access. This counter can only be incremented. |
| Immobilizer Security Code Reset Counter | Ignition ON | Counts | This Parameter displays the number of times the immobilizer security code has been reset to the default value through secure access. This counter can only be incremented. |
| Immobilizer Security Information Programmed | Ignition ON | Yes/No | This Parameter displays the status of the immobilizer system. |
| Immobilizer System Status | Ignition ON | Standby / Immobilized at Startup / Immobilized No Response / Immobilized Negative Response / Immobilized Incorrect Response / Post-Release State / Pre-Release State / Release State | This Parameter displays the status of the immobilizer system. |
| Injector Duty Cycle | - | 1 - 3 ms | This parameter displays the average pulse width of the fuel injectors as determined by the control module. |
| Intake Camshaft Position Active Counter | - | Varies in Counts | This parameter displays an incrementing counter when the control module receives a signal from the intake camshaft position sensor. |
| Intake Camshaft Position | - | 8 - 18° | This parameter displays the advance position of the camshaft in degrees of camshaft rotation from the parked position. Zero indicates the camshaft is in the parked position. |
| Intake Camshaft Position Command | - | 45 - 75% | This parameter displays the commanded duty cycle for the intake camshaft as commanded by the control module. |
| Intake Camshaft Position Variance | - | 0° | This parameter indicates the difference between the actual camshaft angle and the desired camshaft angle. |
| Intake Manifold Pressure | - | 32 - 62 kPa (4.6 - 9 PSI) | This parameter displays the pressure difference between the Manifold Absolute Pressure (MAP) and the barometric pressure (BARO) as calculated by the control module. |
| Knock Retard | - | 0° | This parameter displays the amount of spark advance the control module removes from the ignition control spark advance in response to the signal from the knock sensors. |
| Long Term Fuel Trim | - | -10 to +10% | The scan tool range is -99 to +99%. This parameter indicates the Long Term fuel trim correction as commanded by the ECM. A change made to the fuel delivery will be indicated by the Long and Short Term values. The Short Term values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term values change in response to the changes in the Short Term. The Long Term makes coarse adjustments to the fueling in order to recenter and restore control to the Short Term. The Short Term and the Long Term can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition. |
| Long Term Fuel Trim Test Average | - | 0.98% Varies |
This parameter is the average long term fuel trim for this bank as calculated by the control module. The scan tool will display a value more than 0% indicating that time is being added to the injector pulse width, increasing the amount of fuel to this bank of the engine. The scan tool will display a value of less than 0, indicating time is being subtracted from the injector pulse width, reducing the amount of fuel to this bank of the engine. A value of 0% indicates no compensation is required to operate the engine at the desired air/fuel ratio. |
| Long Term Fuel Trim Test Average without Purge | - | 1.02% Varies |
This parameter is calculated by the control module based on the Short Term Fuel Trim value. The Long Term Fuel Trim is used for the long term correction of the fuel delivery. The scan tool will display a high value for a large amount of long term fuel correction and 0% for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event. |
| MAF Performance Test | - | OK | This parameter displays the status of the mass air flow (MAF) performance test by the control module. The scan tool will display OK if no condition is detected. The scan tool will display Fault if the control module detects a condition during the test. |
| MAF Sensor | Engine Idling | 1.7 - 3.7 g/s | This parameter indicates the quantity calculated by the control module based on a signal from the MAF sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds. |
| Engine speed at 2 500 RPM | 5.5 - 9.5 g/s | ||
| MAF Sensor | - | 1 700 - 2 100 Hz | This parameter indicates the frequency signal received from the MAF sensor by the control module. The scan tool will display a high value at high engine speeds and a low value at low engine speeds. |
| MAF When Engine Overspeed Detected | - | Varies | This parameter displays the air flow of the engine as calculated by the control module based on the signal from the Mass Air Flow Sensor if a engine overspeed condition is detected. |
| MAP Performance Test 1 | - | OK | This parameter displays the status of the MAP performance test 1 by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| MAP Performance Test 2 | - | OK | This parameter displays the status of the MAP performance test 2 by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| MAP Sensor | - | 26 - 52 kPa (3.7 - 7.6 PSI) | This parameter displays the pressure from the MAP sensor to the control module. |
| MAP Sensor | - | 0.98 - 1.42 V | This parameter displays the signal voltage from the MAP sensor to the control module. |
| Maximum Engine Speed When Engine Overspeed Detected | - | Varies | This parameter displays the maximum engine speed stored if an engine overspeed condition is detected. |
| MIL Command | Ignition ON | ON/OFF | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the engine control module (ECM). |
| MIL Requested by DTC | Ignition ON | Yes/No | This parameter indicates the reason the engine control module illuminated the MIL. The scan tool will display YES when the MIL is requested as a result of an A or B type DTC. The scan tool will display NO if the MIL is illuminated for another reason, such as transmission DTCs. |
| Odometer When Engine Overspeed Detected | - | Varies | This parameter displays the vehicle speed stored if an engine overspeed condition is detected. |
| Output Shaft Speed Sensor | Vehicle needs to be moving | RPM | This Parameter displays the transmission output speed (the speed at the output of the gear box) determined from the speed measured by the transmission output speed sensor. |
| Power Enrichment | - | Inactive | This parameter displays the status of the operating mode of the control module used to increase fuel delivery during certain acceleration conditions. |
| Power Mode | Ignition ON | OFF / Accessory / Run/Crank Request | This Parameter displays the state of the System Power Mode. This signal is based upon the state of the system power mode received over serial communication from the vehicle electronics. If the serial data signal not received, the Parameter will display OFF. |
| Radiator Coolant Temperature Sensor | - | -39 to +140°C (-38 to +284°F) | This parameter displays the status of the radiator coolant temperature Sensor. |
| Reduced Engine Power | - | Inactive | This parameter displays the status of the operating mode of the control module used to reduce engine power to prevent catalyst converter or engine damage or due to a Throttle Actuator Control (TAC) system condition. |
| Remaining Fuel in Tank | - | Liters (Gallons) Varies |
This parameter displays the amount of fuel remaining in the fuel tank as measured in liters (gallons). The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensor. The scan tool will display a higher value with a full fuel tank and a lower value with an empty fuel tank. |
| Remaining Fuel in Tank | - | 0 - 100% Varies |
This parameter displays the amount of fuel remaining in the fuel tank as measured in percentage. The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensors. The scan tool will display a higher value with a full fuel tank and a lower value with an empty fuel tank. |
| Reverse Position Switch | - | OFF | Manual Transmission Reverse Switch ON indicates that the reverse switch hard wire input to the ECM is active. |
| Short Term Fuel Trim | - | -10 to +10% | The Short Term values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term values change in response to the changes in the Short Term. The Long Term makes coarse adjustments to the fueling in order to recenter and restore control to the Short Term. The Short Term and the Long Term can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition. |
| Short Term Fuel Trim Test Average | - | -3 to +99% Varies |
This parameter displays the short term closed loop fuel correction. This value is compared to predetermined thresholds to determine if the fuel trim diagnostic is passing or failing. |
| Start Up ECT | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the engine coolant on start up based on input to the control module from the ECT sensor 1. |
| Start Up IAT | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the intake air at start in the air induction system based on input to the control module from the IAT sensor. |
| Starter Relay Command | - | OFF | The scan tool displays ON or OFF. The scan tool displays OFF until the ignition is placed into the CRANK position. |
| SVS Indicator Command | Ignition ON | OFF | This parameter displays the state of the SVS indicator as commanded by the control module. |
| TAC Forced Engine Shutdown | - | NO | This parameter indicates the status of TAC control by the control module. The scan tool will display YES if the engine has been shut down due to a throttle control fault. The scan tool will display NO if the engine has not been shut down by a throttle control fault. |
| TAC Motor | - | Disabled | This parameter indicates the status of the TAC motor driver by the ECM. The scan tool will display Enabled if TAC motor operation is allowed. The scan tool will display disabled if the TAC motor is disabled. |
| TAC Motor Command | - | 0 - 100% Varies |
This parameter displays the percentage of the commanded state of the TAC motor by the control module. |
| TCC/Cruise Control Brake Pedal Switch | - | Released | This parameter displays that the state of the redundant discrete brake switch input to the controller indicates that the brake is applied. |
| Throttle Body Idle Air Flow Compensation | - | 0 - 100% Varies |
This parameter displays the amount of airflow compensation in response to engine intake air flow restrictions. For example, throttle plate coking. |
| Throttle Position | - | 5 - 15% | This parameter displays the actual throttle position angle indicated by the control module using information from the two Throttle Body sensors. |
| Throttle Position Performance Test | - | OK | This parameter displays the status of the throttle position performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| Throttle Position Sensor 1 | Accelerator pedal not actuated | 3.49 - 3.79 V | This parameter displays the voltage signal sent to the control module from throttle position sensor 1 of the throttle assembly. The throttle position sensor 1 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate is fully open. |
| Accelerator pedal fully actuated | 2.29 - 2.49 V | ||
| Throttle Position Sensor 1 Position | - | 4 - 10% | This parameter displays the angle of the throttle position sensor 1 as calculated by the control module using the signal from the throttle position sensor 1. The throttle position sensor 1 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open. |
| Throttle Position Sensor 1 Learned Minimum | - | 0.5 - 0.71 V | This parameter displays the learned minimum voltage for throttle position sensor 1 as determined by the control module this ignition cycle. |
| Throttle Position Sensor 2 | Accelerator pedal not actuated | 1.29 - 1.49 V | This parameter displays the voltage signal sent to the control module from throttle position sensor 2 of the throttle assembly. The throttle position sensor 2 is a range of values indicating a low voltage when the throttle is closed to a high voltage when the throttle plate is fully open. |
| Accelerator pedal fully actuated | 2.45 - 2.65 V | ||
| Throttle Position Sensor 2 Position | - | 4 - 10% | This parameter displays the angle of the throttle position sensor 2 as calculated by the control module using the signal from the throttle position sensor 2. The throttle position sensor 2 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open. |
| Throttle Position Sensor 2 Learned Minimum | - | 0.55 - 0.75 V | This parameter displays the learned minimum voltage for throttle position sensor 2 as determined by the control module this ignition cycle. |
| Throttle Position Sensors 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the Throttle Body sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that throttle position sensor 1 and throttle position sensor 2 voltages correspond to the same throttle position. Disagree indicates that throttle position sensor 1 and throttle position sensor 2 voltages correspond to different throttle positions. |
| Torque Management Ignition Timing Retard | - | 15 - 30° | This parameter displays how much the ignition spark timing is being retarded to control torque by the control module. The scan tool will display a higher value under extreme torque control conditions such as spinning wheels. The scan tool will display a lower value under low torque control conditions such as light driving. |
| Total Engine Overspeed Time | - | Varies | This parameter displays the time, how long an engine overspeed condition was detected. |
| Total Knock Retard | - | 0° | This parameter displays how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions. |
| Total Misfire | - | 0 Counts | This parameter displays the total number of cylinder firing events that the control module detected as misfires for the last 200 crankshaft revolution sample period. |
| Turbocharger Bypass Solenoid Valve Command | - | Inactive | This parameter shows the state of the turbocharger bypass solenoid as commended by the control unit. The scan tool shows either commanded active or inactive. |
| Turbocharger Wastegate Solenoid Valve Command | - | % | This parameter shows the percent of the pulse width modulated (PWM) duty cycle that the wastegate solenoid is commanded. |
| Vehicle Speed Sensor | - | 0 km/h (0 MPH) | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor. |
| Vehicle Speed Sensor When Engine Overspeed Detected | - | 0 km/h (0 MPH) | This parameter displays the speed of the vehicle stored if an engine overspeed is detected. |
| VIN Programming Counter | Ignition ON | Counts | This Parameter displays the number of times the VIN has been programmed. This counter can only be incremented. |
| Warm-ups Since DTC Cleared | - | Varies | This parameter displays the number of warm-ups since the DTC was cleared in counts. |
| Warm-Ups without Emission Malfunctions | - | Varies | This parameter displays the number of warm up cycles that have occurred without an emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without an emission fault. |
| Warm-Ups without Non Emission Malfunctions | - | Varies | This parameter displays the number of warm up cycles that have occurred without a non emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without a non emission fault. |
| Wide Open Throttle | - | NO | This parameter displays the throttle status commanded by the control module. The scan tool will display YES is the vehicle throttle is commanded to wide open. The scan tool will display NO if the vehicle throttle is commanded to an amount less than 100%. |
Engine Control Module (ECM) Scan Tool Output Controls
| Output Control | Description |
|---|---|
| A/C Compressor Clutch Relay | This function activates the A/C compressor relay. The normal commanded state of the A/C relay is None. The A/C compressor will turn ON or OFF when commanded ON or OFF. The system remains in the commanded state until cancelled by the scan tool. The scan tool initiates the test when the following conditions are met:
|
| Clutch Pedal Position Learn | This device control is used to trigger the procedure to learn the clutch pedal fully applied position. |
| Compression Test | This device control is used to set up the internal combustion engine for a compression test. The fuel pump, fuel injectors and spark are all disabled. The throttle is opened to a WOT position. For conventional engine vehicles, the extended crank feature is not active. Engine cranking is completely controlled by the technician either through the ignition key or through a remote starter switch as applicable. The device control limits and rejects will apply normally upon entry to the device control. Once the device control is active, the limits will be monitored (to prevent unwanted starter operation, for example), but in the case of a limit exceeded or a tester disconnect, device control of the fuel and spark will not be released until the Power Mode switches to Accessory or OFF. This will prevent unexpected fuel and spark operation in the case of a device control abort. |
| Cooling Fan Relay 1 | This function controls the cooling fan relay 1. The normal commanded state of the fan relay is None. The scan tool initiates the test when the following conditions are met:
|
| Cooling Fan Relay 2 | This function controls the cooling fan relay 2. The normal commanded state of the fan relay is OFF. The scan tool initiates the test when the following conditions are met:
|
| Crankshaft Position Variation Learn | This device control is used to activate the crankshaft position variation learn algorithm which calculates the reference pulse correction factors for the misfire diagnostic. |
| Cylinder Power Balance | This function disables the selected fuel injector. The normal commanded state is None. The scan tool initiates the test when the following conditions are met:
If the fuel injector is disabled after 30 s, fuel injector control is not allowed again on the same fuel injector for 60 s. |
| Engine Controls Ignition Relay | This function controls the engine control ignition relay or main relay. The normal commanded state is None. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool. The scan tool initiates the test when the following conditions are met:
|
| Engine Coolant Thermostat Heater | This function controls the engine coolant thermostat heater. The normal commanded state is None. The system will increase or decrease the amount of thermostat opening by changing the duty cycle in 10% increments within a range of 0 - 100%. |
| Engine Oil Life Reset | This function is used to reset the engine oil life. The engine oil remaining life is determined from engine revolutions and the distance driven since the last oil change. |
| Engine Speed | This function controls the idle speed override in 25 RPM, 100 RPM and 500 RPM increments, from the base idle speed to 2 045 RPM. The scan tool initiates the test when the following conditions are met:
|
| EVAP Purge Solenoid Valve | This function controls the EVAP purge solenoid valve. The normal commanded state is None. The system will increase or decrease the amount of purge by changing the duty cycle of the purge valve in 10% increments within a range of 0 - 100%. The scan tool initiates the test when the following conditions are met:
|
| Exhaust Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5° increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 s, the actuator control is not allowed again on the same actuator for 60 s. |
| Exhaust Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5° increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 s, the actuator control is not allowed again on the same actuator for 60 s. |
| Fuel Injector Balance | This function enables the fuel injector in order to verify proper fuel injector flow. The ECM will pulse the selected injector when the following conditions are met:
The selected fuel injector can only be flowed or pulsed once per ignition cycle. |
| Fuel Pump Relay | This function controls the fuel pump relay. The normal commanded state is None. When commanded ON or OFF, the ECM turns the fuel pump ON or OFF. The scan tool initiates the test when the following conditions are met:
|
| Fuel Trim Enable | This function enables or disables the ECM fuel trim learning. The normal commanded state is None. |
| Fuel Trim Reset | This function is used to reset the learned fuel trim values to their initial values. |
| Generator L-Terminal | This function is used to override the state of the generator L-terminal output. The commanded states are ON and OFF. Selecting OFF commands the ECM to turn OFF the generator and stop generating an output voltage. The scan tool initiates the test when the following conditions are met:
|
| HO2S Heater Learn | This function is used to trigger the reset of the learned resistances for the oxygen sensor heaters following a replacement. The learned resistances are reset to a calibration used to prevent overheating of the sensors until more accurate resistances may be learned following an extended engine OFF time. |
| Idle Learn | This function is used to reset the learned airflow adaptive values to the initial values. The scan tool initiates the test when the following conditions are met:
|
| Idle Speed Adjustment | This device control allows a service technician to add an offset to the engine idle speed within a restricted range to address customer complaints for vehicle vibration. |
| Intake Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5° increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 s, the actuator control is not allowed again on the same actuator for 60 s. |
| Intake Camshaft Position Actuator Solenoid Valve | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5° increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 s, the actuator control is not allowed again on the same actuator for 60 s. |
| Intake Manifold Runner Control Valve | This device control is used to override the state of the intake manifold tuning valve output. A output test is used to select whether commanding the intake manifold tuning valve output on or off results in the valve being commanded closed or open. |
| Misfire Graphic | This function is used to graph the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph. |
| Starter Relay | This function is used to override the state of the Starter Relay output. Fuel and spark are disabled to prevent the engine from starting if the starter relay output is commanded ON. The scan tool initiates the test when the following conditions are met:
|
| Throttle Position | This function controls the throttle valve in 10% increments. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. |
| Turbocharger Bypass Solenoid Valve | Turbocharger bypass solenoid command ON/OFF |
| Turbocharger Learn | This turbocharger learn is used to reset the ECM adaption parameter when the turbocharger is replaced. |
| Turbocharger Wastegate Solenoid Valve | Turbocharger wastegate solenoid command 0 - 100% |