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 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 Techstream, 5 separate sets of freeze frame data can be checked.
- 3 data set 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 the cause of the malfunction, and in judging whether it was temporary or not.
- LIST OF FREEZE FRAME DATA LIST OF FREEZE FRAME DATA
LABEL (Tester Display) Measurement Item/Range Diagnostic Note Trouble Code Freeze DTC - Injector (Port) Injection period of No. 1 cylinder - IGN Advance Ignition advance - Calculate Load Calculated load Calculated load by ECM Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount MAF Mass air flow volume If approximately 0.0 g/sec.: - Mass air flow meter power source circuit open or shorted
- VG circuit open or shorted
If 271.0 g/sec. or more:- E2G circuit open
Engine Speed Engine speed - Vehicle Speed Vehicle speed Speed indicated on speedometer Coolant Temp Engine coolant temperature If -40°C (-40°F), sensor circuit open
If 140°C (284°F) or more, sensor circuit shortedIntake Air Intake air temperature If -40°C (-40°F), sensor circuit open
If 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 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 (APP) No. 1 - Accelerator Position No. 2 Absolute APP No. 2 - Throttle Position Throttle position - Throttle Sensor Position Throttle sensor positioning - Throttle Sensor Position #2 Throttle sensor positioning #2 - Throttle Motor Throttle actuator - O2S B1 S2 Heated oxygen sensor output 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 A/F sensor output 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 Total FT #1 Total fuel trim - 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 for a continual deviation of short-term fuel trim from central value Fuel System Status (Bank 1) 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
- OL DRIVE: Open loop due to driving conditions (fuel enrichment) OL FAULT: Open loop due to detected system fault
- CL FAULT: Closed loop but heated oxygen sensor, which is used for fuel control, malfunctioning
AF FT B1 S1 Fuel trim at A/F sensor - AFS B1 S1 A/F sensor output Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor Catalyst Temp (B1 S1) Estimated catalyst temperature (sensor 1) - Catalyst Temp (B1 S2) Estimated catalyst temperature (sensor 2) - Sub O2S Impedance B1S2 Sub O2S Impedance B1S2 - Initial Engine Coolant Temp Engine coolant temperature at engine start - Initial Intake Air Temp Intake air temperature at engine start - Injection Volume (Cylinder 1) Injection volume - Starter Signal Starter switch (STSW) signal - Power Steering Switch Power Steering Signal - Power Steering Signal Power Steering Signal (history) Signal status usually ON until ignition switch is turned off Closed Throttle Position SW Closed throttle position switch - A/C Signal A/C signal - Neutral Position SW Signal *1 Park/Neutral Position (PNP) switch signal - Electrical Load Signal Electrical load signal - Stop Light Switch Stop light switch - Battery Voltage Battery voltage - Atmosphere Pressure Atmosphere Pressure - EVAP Purge VSV Purge VSV - Fuel Pump/Speed Status Fuel pump/speed status - WT Control Status (Bank 1) WT control status (bank 1) - Vacuum Pump Vacuum pump ON: Operate EVAP System Vent Valve EVAP System Vent Valve ON: Close Electric Fan Motor Electric fan motor - TC and TE1 TC and TE1 terminals of DLC3 - Engine Speed of Cyl #1 Engine rpm during No. 1 cylinder fuel cut Output only when FUEL CUT #1 is performed using ACTIVE TEST Engine Speed of Cyl #2 Engine rpm during No. 2 cylinder fuel cut Output only when FUEL CUT #2 is performed using ACTIVE TEST Engine Speed of Cyl #3 Engine rpm during No. 3 cylinder fuel cut Output only when FUEL CUT #3 is performed using ACTIVE TEST Engine Speed of Cyl #4 Engine rpm during No. 4 cylinder fuel cut Output only when FUEL CUT #4 is performed using ACTIVE TEST Av Engine Speed of All Cyl Average of engine rpm values during fuel cut of No. 1 to No. 4 cylinders Output only when ACTIVE TEST is performed WT Aim Angle (Bank 1) WT aim angle (bank 1) - WT Change Angle (Bank 1) WT change angle (bank 1) - WT OCV Duty (Bank 1) WT OCV operation duty (bank 1) - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 1,500 rpm FC TAU Fuel cut with a very light load Fuel cut being performed with a very light load to prevent incomplete engine combustion Ignition Ignition counter - Cylinder #1 Misfire Count Cylinder #1 misfire count Displayed only during idling Cylinder #2 Misfire Count Cylinder #2 misfire count Displayed only during idling Cylinder #3 Misfire Count Cylinder #3 misfire count Displayed only during idling Cylinder #4 Misfire Count Cylinder #4 misfire count Displayed only during idling All Cylinders Misfire Count All cylinder misfire count Displayed only during idling All Cylinders Misfire Count All Cylinders Misfire Count: Min.: 0, Max.: 255 - Misfire RPM Engine speed when misfire occurs - Misfire Load Engine load when misfire occurs - Misfire Margin Margin to detect engine misfire - Catalyst OT MF F/C Catalyst Over Tmp Misfire prevention F/C - Cat OT MF F/C History Catalyst Over Tmp Misfire prevention F/C history - Cat OT MF F/C Cylinder #1 Catalyst Over Tmp Misfire prevention F/C #1 - Cat OT MF F/C Cylinder #2 Catalyst Over Tmp Misfire prevention F/C #2 - Cat OT MF F/C Cylinder #3 Catalyst Over Tmp Misfire prevention F/C #3 - Cat OT MF F/C Cylinder #4 Catalyst Over Tmp Misfire prevention F/C #4 - Engine Run Time Accumulated engine running time - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance after DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared - HINT: - *1: Automatic transaxle only