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 running or stopped, 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 duplicate the problem even though a DTC is detected, confirm the freeze frame data.
- The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, five separate sets of freeze frame data, including the data values at the time when the DTC was set, can be checked.
- 3 data sets before the DTC was set
- 1 data set when the DTC was set
- 1 data set after the DTC was set
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 of the cause of the malfunction, and in judging whether it was temporary or not.
- 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 running or stopped, 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.
- LIST OF FREEZE FRAME DATA
Tester Display Measurement Item Diagnostic Note Injector (Port) Injection period of No. 1 cylinder - IGN Advance Ignition advance - Calculate Load Calculated load Calculated load by ECM Vehicle Load Vehicle load - MAF Mass air flow volume If approximately 0.0 g/sec.: - Mass air flow meter power source circuit open or short
- VG circuit open or short
If 271.0 gm/s. or more:- E2G circuit open
Engine Speed Engine speed - Vehicle Speed Vehicle speed Speed indicated on speedometer Coolant Temp Engine coolant temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (284°F) or more, sensor circuit shortedIntake Air Intake air temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (284°F) or more, sensor circuit shortedAir-Fuel Ratio Ratio compared to stoichiometric level - Purge Density Learn Value Learning value of purge density - Evap Purge Flow Ratio of evaporative purge flow to intake air volume - EVAP (Purge) VSV EVAP purge VSV duty ratio - Knock Correct Learn Value Correction learning value of knocking - Knock Feedback Value Feedback value of knocking - Accelerator Position No. 1 Absolute accelerator pedal position No. 1 - Accelerator Position No. 2 Absolute accelerator pedal position No. 2 - Throttle Pos. Sensor Output Absolute throttle position - Throttle Sensor Position Throttle sensor positioning - Throttle Sensor Position #2 Absolute throttle sensor positioning #2 - Throttle Motor Duty Throttle actuator - O2S B1 S2 Heated oxygen sensor output voltage Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor O2S B2 S2 Heated oxygen sensor output voltage Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor AFS B1 S1 Air fuel ratio sensor output voltage Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor AFS B2 S1 Air fuel ratio sensor output voltage Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor AFS B2 S1 Air fuel ratio sensor current - Total FT #1 Total fuel trim (bank 1) - Total FT #2 Total fuel trim (bank 2) - Short FT #1 Short-term fuel trim Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air fuel ratio Long FT #1 Long-term fuel trim Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve Short FT #2 Short-term fuel trim Short-term fuel compensation used to maintain air fuel ratio at stoichiometric air fuel ratio Long FT #2 Long-term fuel trim Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve Fuel System Status (Bank1) Fuel system status (bank 1) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using heated oxygen sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but heated oxygen sensor, which used for fuel control, malfunctioning
Fuel System Status (Bank2) Fuel system status (bank 2) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using heated oxygen sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but heated oxygen sensor, which used for fuel control, malfunctioning
AFS B1 S1 Air fuel ratio sensor current - AF FT B2 S1 Fuel trim at air fuel ratio sensor - Catalyst Temp (B1 S1) Estimated catalyst temperature (bank 1 sensor 1) - Catalyst Temp (B2 S1) Estimated catalyst temperature (bank 2 sensor 1) - Catalyst Temp (B1 S2) Estimated catalyst temperature (bank 1 sensor 2) - Catalyst Temp (B2 S2) Estimated catalyst temperature (bank 2 sensor 2) - Sub O2S Impedance B1S2 Sub heated oxygen sensor impedance (bank 1 sensor 2) - Sub O2S Impedance B2S2 Sub heated oxygen sensor impedance (bank 2 sensor 2) - Initial Engine Coolant Temp Initial engine coolant temperature - Initial Intake Air Temp Initial intake air temperature - Injection Volum (Cylinder1) Injection volume - Starter Signal Starter switch signal - Power Steering Switch Power steering switch - Power Steering Signal Power steering signal (history) - Closed Throttle Position SW Closed throttle position switch - A/C Signal A/C signal - Neutral Position SW Signal Park/neutral position switch signal - Electrical Load Signal Electrical load signal - Stop Light Switch Stop light switch - Battery Voltage Battery voltage - Atmosphere Pressure Atmosphere pressure - ACIS VSV VSV for Acoustic control induction system - VVT Control Status (Bank2) VVT control status - EVAP Purge VSV EVAP Purge VSV - Fuel Pump/Speed Status Fuel pump/speed status - VVT Control Status (Bank1) VVT control status - Vacuum Pump Key-off EVAP system leak detection pump status Refer to EVAP System EVAP System Vent Value Key-off EVAP system vent valve status - TC and TE1 TC and CG (TE1) terminals of DLC3 - VVT Aim Angle (Bank1) VVT aim angle - VVT Change Angle (Bank1) VVT change angle - VVT OCV Duty (Bank1) VVT OCV operation duty - VVT Aim Angle (Bank2) VVT aim angle - VVT Change Angle (Bank2) VVT change angle - VVT OCV Duty (Bank2) VVT OCV operation duty - Idle Fuel Cut Fuel cut idle ON: when throttle valve fully closed and engine speed over 3500 rpm FC TAU Fuel cut during very light load Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete Ignition Ignition counter - Cylinder #1 Misfire Count Cylinder #1 misfire Only displayed during idling Cylinder #2 Misfire Count Cylinder #2 misfire Only displayed during idling Cylinder #3 Misfire Count Cylinder #3 misfire Only displayed during idling Cylinder #4 Misfire Count Cylinder #4 misfire Only displayed during idling Cylinder #5 Misfire Count Cylinder #5 misfire Only displayed during idling Cylinder #6 Misfire Count Cylinder #6 misfire Only displayed during idling All Cylinders Misfire Count All cylinders misfire Only displayed during idling Misfire RPM Engine speed when misfire occurred - Misfire Load Engine load when misfire occurred - Misfire Margin Margin to detect engine misfire - Engine Run Time Accumulated engine running time - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance from DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared -