K71 Transmission Control Module: Scan Tool Information
The Transmission Control Module Scan Tool Data List contains all transmission related parameters that are available on the scan tool. 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.
The values below represent a typical display recorded from a properly functioning system.
Only the parameters listed below are used/referenced in this service information for diagnosis. If a scan tool displays other parameters, those values are not recommended by General Motors for use in diagnosis.
The scan tool values from a properly functioning transmission may be used for comparison with the transmission you are diagnosing. The values below represent a typical display recorded from a properly functioning system.
Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| 9V Reference 1 Circuit Status | - | OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| 9V Reference 2 Circuit Status | - | OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Calculated Line Pressure | Ignition On - Engine Off | 362 kPa (53 PSI) | Indicates a calculated line pressure value based on various engine and transmission input data. |
| Ignition On - Engine Running | 650 kPa (92 PSI) | ||
| 48 km/h (30 MPH) | 424 kPa (61 PSI) | ||
| 80 km/h (50 MPH) | 706 kPa (102 PSI) | ||
| Calculated Throttle Position | 0 km/h (0 MPH) | 0% | Indicates a calculated value based on accelerator pedal position and throttle position. Zero percent indicates idle position and 100 percent indicates wide open throttle. |
| 48 km/h (30 MPH) | 8% | ||
| 80 km/h (50 MPH) | 16% | ||
| Control Module Voltage Signal | Ignition On - Engine Off | 12.40 V | Indicates the voltage value on the signal circuit to the Transmission Control Module. |
| Ignition On - Engine Running | 13.90 V | ||
| Current Gear | P | Park | Indicates the current gear range the transmission has obtained. |
| R | Reverse | ||
| N | Neutral | ||
| D | 1-9 | ||
| L/M | 1-9 | ||
| Driver Shift Control Mode | P, R, N, D | Inactive | Indicates the driver has taken control of shifting the transmission. |
| L, M | Active | ||
| Engine Coolant Temperature | Ignition On - Engine Off | 41°C (105°F) | Indicates to the transmission control module the temperature of the engine coolant temperature, sent from the engine control module. |
| Ignition On - Engine Running | 52°C (126°F) | ||
| 48 km/h (30 MPH) | 87°C (189°F) | ||
| 80 km/h (50 MPH) | 94°C (201°F) | ||
| Engine Speed | Ignition On - Engine Off | 0 RPM | Indicates the rotational speed of the engine crankshaft in revolutions per minute. |
| Ignition On - Engine Running | 999 RPM | ||
| 48 km/h (30 MPH) | 1635 RPM | ||
| 80 km/h (50 MPH) | 1385 RPM | ||
| Engine Torque | Ignition On - Engine Off | -10 Nm (-7 lb ft) | Indicates a calculated value based on various engine input and output data values. |
| Ignition On - Engine Running | -1 Nm (-1 lb ft) | ||
| 48 km/h (30 MPH) | 39 Nm (29 lb ft) | ||
| 80 km/h (50 MPH) | 115 Nm (85 lb ft) | ||
| Gear Command | P | Park | Indicates the current gear range the transmission control module has commanded. |
| R | Reverse | ||
| N | Neutral | ||
| D | 1-9 | ||
| L/M | 1-9 | ||
| Gear Ratio | 1 | 4.689:1 | Indicates a calculated value based on the RPM values of the ISS, Intermediate SS and OSS. |
| 2 | 3.306:1 | ||
| 3 | 3.012:1 | ||
| 4 | 2.446:1 | ||
| 5 | 1.923:1 | ||
| 6 | 1.446:1 | ||
| 7 | 1.000:1 | ||
| 8 | 0.747:1 | ||
| 9 | 0.617:1 | ||
| R | 2.960:1 | ||
| High Side Driver 1 Circuit High Voltage Test Status | - | OK | This Parameter Identifier (PID) contains the status of the short to voltage test. |
| High Side Driver 1 Circuit Low Voltage Test Status | - | OK | This Parameter Identifier (PID) contains the status of the short to ground test. |
| High Side Driver 1 Circuit Open Test Status | - | Not Run | This Parameter Identifier (PID) contains the status of the open circuit test. |
| High Side Driver 2 Circuit High Voltage Test Status | - | OK | This Parameter Identifier (PID) contains the status of the short to voltage test. |
| High Side Driver 2 Circuit Low Voltage Test Status | - | OK | This Parameter Identifier (PID) contains the status of the short to ground test. |
| High Side Driver 2 Circuit Open Test Status | - | Not Run | This Parameter Identifier (PID) contains the status of the open circuit test. |
| Ignition 1 Signal | - | On | Indicates the transmission control module has received the ignition 1 signal. |
| Ignition Accessory Signal | - | On | Indicates the transmission control module has received the ignition accessory voltage signal. |
| Ignition Voltage | Ignition On - Engine Off | 12.40 V | Indicates the available ignition voltage to the transmission control module. |
| Ignition On - Engine Running | 13.90 V | ||
| Park System Status | P | Park | Displays the status of the Transmission Park Valve Lock Solenoid Actuator when each gear position is selected. |
| R, N, D, L, M | Out of Park | ||
| Power Mode | - | Run | Indicates to the transmission control module the present position of the ignition switch. |
| TCC Slip Speed | Ignition On - Engine Off | 0 RPM | Indicates the RPM difference between the torque converter impeller and the torque converter turbine when the converter clutch is applied. |
| Ignition On - Engine Running | 77 RPM | ||
| 48 km/h (30 MPH) | 28 RPM | ||
| 80 km/h (50 MPH) | 17 RPM | ||
| Transmission Accumulator Solenoid Valve Command | - | Off | Indicates if the transmission control module has commanded a transmission control solenoid either ON or OFF. |
| Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Accumulator Solenoid Valve Control Circuit Low Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Accumulator Solenoid Valve Control Circuit Open Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Control Solenoid Valve 1-8 Calibration Data | - | Valid | Indicates if the calibration data for the programmable solenoid is programmed or programmed correctly. |
| Transmission Control Solenoid Valve 1-10 Control Circuit High Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Control Solenoid Valve 1-10 Control Circuit Low Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Control Solenoid Valve 1-10 Control Circuit Open Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Control Solenoid Valve 1 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.05 A | ||
| 80 km/h (50 MPH) | 0.91 A | ||
| Transmission Control Solenoid Valve 1 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.04 A | ||
| 80 km/h (50 MPH) | 0.91 A | ||
| Transmission Control Solenoid Valve 1 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 1, 700 kPa (246.5 PSI) | ||
| 80 km/h (50 MPH) | 20 kPa (2.9 PSI) | ||
| Transmission Control Solenoid Valve 2 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.15 A | ||
| 80 km/h (50 MPH) | 0.14 A | ||
| Transmission Control Solenoid Valve 2 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.13 A | ||
| 80 km/h (50 MPH) | 0.13 A | ||
| Transmission Control Solenoid Valve 2 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 20 kPa (3 PSI) | ||
| 80 km/h (50 MPH) | 20 kPa (3 PSI) | ||
| Transmission Control Solenoid Valve 3 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.05 A | ||
| 80 km/h (50 MPH) | 1.10 A | ||
| Transmission Control Solenoid Valve 3 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.04 A | ||
| 80 km/h (50 MPH) | 1.10 A | ||
| Transmission Control Solenoid Valve 3 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 0 kPa (0 PSI) | ||
| 80 km/h (50 MPH) | 1, 200 kPa (174 PSI) | ||
| Transmission Control Solenoid Valve 4 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.31 A | ||
| 80 km/h (50 MPH) | 0.31 A | ||
| Transmission Control Solenoid Valve 4 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.30 A | ||
| 80 km/h (50 MPH) | 0.30 A | ||
| Transmission Control Solenoid Valve 4 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 168.8 kPa (24.5 PSI) | ||
| 80 km/h (50 MPH) | 168.8 kPa (24.5 PSI) | ||
| Transmission Control Solenoid Valve 5 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.05 A | ||
| 80 km/h (50 MPH) | 0.15 A | ||
| Transmission Control Solenoid Valve 5 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.04 A | ||
| 80 km/h (50 MPH) | 0.13 A | ||
| Transmission Control Solenoid Valve 5 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 0 kPa (0 PSI) | ||
| 80 km/h (50 MPH) | 20 kPa (3 PSI) | ||
| Transmission Control Solenoid Valve 6 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.05 A | ||
| 80 km/h (50 MPH) | 0.05 A | ||
| Transmission Control Solenoid Valve 6 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.04 A | ||
| 80 km/h (50 MPH) | 0.04 A | ||
| Transmission Control Solenoid Valve 6 Pressure Command | Ignition On - Engine Off | 0 kPa (0 PSI) | This Parameter Identifier (PID) contains the commanded pressure for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0 kPa (0 PSI) | ||
| 48 km/h (30 MPH) | 2212 kPa (320 PSI) | ||
| 80 km/h (50 MPH) | 2212 kPa (320 PSI) | ||
| Transmission Control Solenoid Valve 7 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.85 A | ||
| 80 km/h (50 MPH) | 0.70 A | ||
| Transmission Control Solenoid Valve 7 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.90 A | ||
| 80 km/h (50 MPH) | 0.70 A | ||
| Transmission Control Solenoid Valve 8 Current | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Average Diagnostic Current for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.37 A | ||
| 80 km/h (50 MPH) | 0.55 A | ||
| Transmission Control Solenoid Valve 8 Current Command | Ignition On - Engine Off | 0.01 A | This Parameter Identifier (PID) contains the Current Command for the Transmission Control Solenoid Valve |
| Ignition On - Engine Running | 0.01 A | ||
| 48 km/h (30 MPH) | 0.37 A | ||
| 80 km/h (50 MPH) | 0.54 A | ||
| Transmission Control Solenoid Valve 9 | - | OfforOn | Indicates if the transmission control module has commanded a transmission control solenoid either ON or OFF. |
| Transmission Control Solenoid Valve 10 | - | OfforOn | Indicates if the transmission control module has commanded a transmission control solenoid either ON or OFF. |
| Transmission Fluid Temperature | Ignition On - Engine Off | 41°C (105°F) | Indicates the temperature of the transmission fluid in the transmission oil pan. |
| Ignition On - Engine Running | 52°C (126°F) | ||
| 48 km/h (30 MPH) | 87°C (189°F) | ||
| 80 km/h (50 MPH) | 94°C (201°F) | ||
| Transmission Hot Mode | - | No | Indicates whether or not the default Transmission Hot Mode shift pattern is active. Transmission Hot Mode is a preventive protection method that attempts to keep the transmission from overheating. When the transmission enters Hot Mode, a new shift pattern is used, it is intended to operate the transmission in the most effective gear/TCC state to cool the transmission. Additionally, a maximum vehicle speed limit can be applied. Once transmission Hot Mode is entered, certain messages are available on the bus so that the driver can be notified through the DIC of the conditions. |
| Transmission Intermediate Speed Sensor | 0 km/h (0 MPH) | 0 RPM | Indicates the rotational speed of the transmission 3-8 and 5-7-R clutch hub assembly. |
| 48 km/h (30 MPH) | 3070 RPM | ||
| 80 km/h (50 MPH) | 0 RPM | ||
| Transmission Intermediate Speed Sensor Direction | Reverse | Forward | Provides directional information for the 5 - 7 - R Clutch. This component is held in 3rd and 8th gears, the parameter will display the last known direction signal when in these gears. |
| 1 | Reverse | ||
| 2 | Reverse | ||
| 3 | - | ||
| 4 | Forward | ||
| 5 | Forward | ||
| 6 | Forward | ||
| 7 | Forward | ||
| 8 | - | ||
| 9 | Reverse | ||
| Transmission Intermediate Speed Sensor Direction Signal | 5-7 - R Clutch =Forward | 0.04 ms | Displays the on time of the signal from the speed sensor. |
| 5 - 7 - R Clutch=Reverse | 0.16 ms | ||
| Transmission ISS | Ignition On - Engine Off | 0 RPM | Indicates the rotational speed of the transmission input shaft in revolutions per minute. |
| Ignition On - Engine Running | 0 RPM | ||
| 48 km/h (30 MPH) | 1610 RPM | ||
| 80 km/h (50 MPH) | 1370 RPM | ||
| Transmission Output Speed Sensor Direction | Forward | Forward | This Parameter Identifier (PID) contains the enumerated state of the raw Transmission Output Speed Sensor direction information. This parameter will display Undetermined State, until the TCM receives the speed sensor input. |
| Reverse | Reverse | ||
| Transmission Output Speed Sensor Direction Signal | Forward | 0.04 ms | This Parameter Identifier (PID)This Parameter Identifier (PID) contains the enumerated state of the raw Transmission Output Speed Sensor direction information. This parameter contains the Transmission Output Speed Sensor Direction ON Period Time in milliseconds. This PID will display 0.00 ms until the TCM receives the speed sensor input |
| Reverse | 0.16 ms | ||
| Transmission OSS | Ignition On - Engine Off | 0 RPM | Indicates the rotational speed of the transmission output shaft in revolutions per minute. |
| Ignition On - Engine Running | 0 RPM | ||
| 48 km/h (30 MPH) | 1115 RPM | ||
| 80 km/h (50 MPH) | 1830 RPM | ||
| Transmission Park Valve Lock Solenoid Actuator | Park | Off | Displays the position of the park servo pin. When energized or applied it holds the parking pawl out of Park. When released it allows the parking pawl to return to the Park position. |
| Out of Park | On | ||
| Transmission Park Valve Lock Solenoid Actuator Control Circuit High Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Park Valve Lock Solenoid Actuator Control Circuit Low Voltage Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Park Valve Lock Solenoid Actuator Control Circuit Open Test Status | - | Not Run or OK | Indicates if the transmission control module has run a diagnostic circuit test and/or displays the present electrical condition of the circuit. |
| Transmission Park Valve Position Sensor 1 | Park | 0.80 V | Displays the signal voltage of Sensor 1 of the Transmission Park Valve Position Switch to the TCM. |
| Out of Park | 2.00 V | ||
| Transmission Park Valve Position Sensor 2 | Park | 0.80 V | Displays the signal voltage of Sensor 2 of the Transmission Park Valve Position Switch to the TCM. |
| Out of Park | 2.00 V | ||
| Transmission Park Valve Position Sensor 1 Status | Park | Park | Displays the status of Sensor 1 of the Transmission Park Valve Position Switch to the TCM. |
| Out of Park | Out of Park | ||
| Transmission Park Valve Position Sensor 2 Status | Park | Park | Displays the status of Sensor 2 of the Transmission Park Valve Position Switch to the TCM. |
| Out of Park | Out of Park | ||
| Transmission Range Control Valve 1 Position Switch | Park | 0.80 V | Displays the signal voltage of Valve 1 of the Transmission Range Control Valve Position Switch to the TCM. |
| Out of Park | 1.98 V | ||
| Transmission Range Control Valve 2 Position Switch | Park | 0.80 V | Displays the signal voltage of Valve 2 of the Transmission Range Control Valve Position Switch to the TCM. |
| Out of Park | 1.98 V | ||
| Transmission Range Control Valve 1 Position Switch Status | Park | Complete | Displays the status of Valve 1 of theTransmission Range Control Valve Position Switch to the TCM. |
| Out of Park | Not Running | ||
| Transmission Range Control Valve 2 Position Switch Status | Park | Complete | Displays the status of Valve 2 of the Transmission Range Control Valve Position Switch to the TCM. |
| Out of Park | Not Running | ||
| Transmission Range Sensor 1 | P | 15% | Indicates the percentage of duty cycle of the PWM signal from the transmission range switch to the transmission control module. |
| R | 44% | ||
| N | 58% | ||
| D | 62% | ||
| L/M | 85% | ||
| Transmission Range Sensor 2 | P | 85% | Indicates the percentage of duty cycle of the PWM signal from the transmission range switch to the engine control module. |
| R | 56% | ||
| N | 42% | ||
| D | 27% | ||
| L/M | 15% | ||
| Up and Down Shift Switch | No Button Pressed | Inactive | The status of the Up and Down shift switches. |
| Upshift - Pressed | Upshift | ||
| Downshift - Pressed | Downshift | ||
| Vehicle Speed | - | Varies | Indicates the rotational speed of the drive wheels in km/h (MPH). |
K71 Transmission Control Module - Scan Tool Control Function
| Control Function | Description |
|---|---|
| High Side Driver 1-2 | Overrides the state of the High Side Driver Output |
| Shift Transmission Gear | Overrides the commanded gear output |
| Transmission Accumulator Pressure Charging | Allows you to charge the accumulator with line pressure with the engine running. |
| Transmission Accumulator Solenoid Valve | Allows you to command solenoid OFF or ON. |
| Transmission Service Fast Learn | A service fast learn procedure to be perform for any internal component repair/replacement, solenoid/valve body replacement, complete transmission replacement or transmission control module replacement. |
| Transmission Control Solenoid Valve 1 - 10 | Overrides the state of the Transmission Control Solenoid Valve - On or Off |
| Transmission Control Solenoid Valve 1 - 10 Current | Overrides the current of the Transmission Control Solenoid Valve - 0 - 1.2 A |