Freeze Frame Data
- DESCRIPTION
The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
HINT:
If it is impossible to replicate the problem even though a DTC is output, confirm the freeze frame data. The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, 5 separate sets of freeze frame data, including the data values at the time when the DTC is stored, can be checked.
- 3 data sets before the DTC is stored.
- 1 data set when the DTC is stored.
- 1 data set after the DTC is stored.
These data sets can be used to simulate the condition of the vehicle around the time of the occurrence of the malfunction. The data may assist in identifying the cause of the malfunction, and in judging whether it was temporary or not.
- LIST OF FREEZE FRAME DATA LIST OF FREEZE FRAME DATA
Tester Display Measurement Item Diagnostic Note Vehicle Speed Vehicle speed The speed indicated on the speedometer. Engine Speed Engine speed - Calculate Load Calculated load The load calculated by the ECM. Vehicle Load Vehicle load The load percentage in terms of the maximum intake air flow amount. MAF Air flow rate from Mass Air Flow (MAF) meter If the value is approximately 0.0 g/sec: - The Mass Air Flow (MAF) meter power source circuit is open.
- The VG circuit is open or shorted.
If the value is 160.0 g/sec or more:- The E2G circuit is open.
Atmosphere Pressure Atmospheric pressure - Coolant Temp Engine coolant temperature - If the value is -40°C (-40°F), the sensor circuit is open.
- If the value is 140°C (284°F), the sensor circuit is shorted.
Intake Air Intake air temperature - If the value is -40°C (-40°F), the sensor circuit is open.
- If the value is 140°C (284°F), the sensor circuit is shorted.
Ambient Temperature Ambient temperature - Engine Run Time Accumulated engine running time - Initial Engine Coolant Temp Engine coolant temperature at engine start - Initial Intake Air Temp Initial intake air temperature - Battery Voltage Battery voltage - Accel Sens. No. 1 Volt % Absolute accelerator pedal position No. 1 - Accel Sens. No. 2 Volt % Absolute accelerator pedal position No. 2 - Throttle Sensor Volt % Absolute throttle position sensor The throttle opening angle recognized by the ECM.
Read the value with the ignition switch ON.Throttl Sensor #2 Volt % Absolute throttle position sensor #2 The throttle opening angle recognized by the ECM.
Read the value with the ignition switch ON.Throttle Sensor Position Throttle sensor positioning The calculated value based on VTA1.
Read the value with the ignition switch ON.Throttle Motor DUTY Throttle actuator - Injector (Port) Injection period of No. 1 cylinder - Injection Volum (Cylinder 1) Injection volume (cylinder 1) The quantity of fuel injection volume for 10 times. Fuel Pump/Speed Status Fuel pump/status - Vacuum Pump Key-off EVAP system leak detection pump status - TCV Status TCV status - EVAP (Purge) VSV EVAP (purge) VSV control duty The order signal from the ECM. Evap Purge Flow Ratio of evaporative purge flow to intake air volume - Purge Density Learn Value Learned value of purge density - EVAP System Vent Valve Key-off EVAP system vent valve status - EVAP Purge VSV VSV status for EVAP control - Purge Cut VSV Duty Purge cut VSV duty - Target Air-Fuel Ratio Ratio compared to stoichiometric level - AF Lambda B1 S1 Fuel trim at A/F sensor - AFS Voltage B1 S1 A/F sensor output voltage for bank 1 sensor 1 Performing the Control the Injection Volume or Control the Injection Volume for A/F Sensor function of the Active Test enables the technician to check the output voltage of the sensor. AFS Current B1 S1 Air fuel ratio sensor output current for bank 1 sensor 1 - A/F Heater Duty #1 A/F heater duty ratio - O2S B1 S2 Heated oxygen sensor output voltage for bank 1 sensor 2 Performing the Control the Injection Volume or Control the Injection Volume for A/F Sensor function of the Active Test enables the technician to check the output voltage of the sensor. O2S Impedance B1 S2 Heated oxygen sensor impedance for bank 1 sensor 2 - O2 Heater B1 S2 Heated oxygen sensor heater - O2 Heater Curr Val B1 S2 Heated oxygen sensor current for bank 1 sensor 2 - Short FT #1 Short-term fuel trim of bank 1 Short-term fuel compensation is used to maintain the air-fuel ratio at the stoichiometric air-fuel ratio. Long FT #1 Long-term fuel trim of bank 1 Overall fuel compensation is carried out in the long-term to compensate for a continual deviation of the short-term fuel trim from the central value. Total FT #1 Total fuel trim of bank 1 - Fuel System Status #1 Fuel system status (bank 1) - OL (Open Loop): Has not yet satisfied the conditions to go to closed loop.
- CL (Closed Loop): Using the heated oxygen sensor as feedback for fuel control.
- OL Drive: Open loop due to driving conditions (fuel enrichment).
- OL Fault: Open loop due to a detected system fault.
- CL Fault: Closed loop but the heated oxygen sensor, which is used for fuel control, is malfunctioning.
Fuel System Status #2 Fuel system status (bank 2) IGN Advance Ignition timing advance for No. 1 cylinder - Knock Feedback Value Feedback value of knocking - Knock Correct Learn Value Learned knocking correction value - ACIS VSV VSV for acoustic control induction system (ACIS) - IAC Sensor Voltage Intake air control valve position sensor output voltage - Intake Air Control Position Intake air control valve position - VVT Control Status #1 VVT control (bank 1) status - Catalyst Temp B1 S1 Estimated catalyst temperature (for sensor 1) - Catalyst Temp B1 S2 Estimated catalyst temperature (for sensor 2) - Starter Signal Starter signal (STA terminal input status) - Starter Control Starter switch status - Power Steering Signal Record Power steering switch status - Starter Relay Starter relay status - ACC Relay ACC relay status - Neutral Position SW Signal Park/neutral position switch status - Stop Light Switch Stop light switch status - A/C Signal A/C switch status - Idle Up Signal Idle up signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel-cut condition - Immobiliser Communication Immobiliser communication - TC Terminal TC terminal status - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Total distance vehicle driven after DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared - Dist Batt Cable Disconnect Total distance vehicle driven after battery cable disconnected - IG OFF Elapsed Time Cumulative time after ignition switch off - TC and TE1 TC and CG (TE1) terminals of DLC3 - Ignition Trig. Count Ignition counter to calculated misfire count - Cylinder #1 Misfire Count Misfire count of cylinder 1 This item is displayed only when idling. Cylinder #2 Misfire Count Misfire count of cylinder 2 This item is displayed only when idling. Cylinder #3 Misfire Count Misfire count of cylinder 3 This item is displayed only when idling. Cylinder #4 Misfire Count Misfire count of cylinder 4 This item is displayed only when idling. All Cylinders Misfire Count All cylinders misfire count - Misfire RPM Average engine speed when misfire occurs - Misfire Load Average engine load when misfire occurred - Misfire Margin Margin to detect engine misfire - Catalyst OT MF F/C Availability of fuel-cut function to prevent misfire causing catalyst overheat - Cat OT MF F/C History History of fuel-cut function to prevent misfire causing catalyst overheat - Cat OT MF F/C Cylinder#1 Display of fuel cut operation in No. 1 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#2 Display of fuel cut operation in No. 2 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#3 Display of fuel cut operation in No. 3 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#4 Display of fuel cut operation in No. 4 cylinder (if certain level of misfire malfunction is detected) - Tumble C.V Duty Ratio Intake air control valve duty ratio - Electric Fan Motor Electric fan motor status - Idle Fuel Cut Prohibit Prohibition of fuel cut at idle - Idle Fuel Cut Fuel cut idle ON: When the throttle valve is fully closed and the engine speed is more than 2800 rpm. FC TAU Fuel cut during very light load The fuel cut is being performed under a very light load to prevent the engine combustion from becoming incomplete. Electrical Load Signal 1 Electrical load signal - Electrical Load Signal 3 Electrical load signal -