Freeze Frame Data
- DESCRIPTION
The ECM records vehicle and driving condition information as freeze frame data when a malfunction is detected. When troubleshooting, it can help determine if the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was Lean or Rich, and other data from the time the malfunction occurred.
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, 5 separate sets of freeze frame data 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 the cause of the malfunction, and in judging whether it was temporary or not.
- LIST OF FREEZE FRAME DATA DIAGNOSTIC NOTE
Tester Display Measurement Item 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 - 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 160.0 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 EVAP purge VSV duty ratio - Knock Correction 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 Pos Sensor Output Throttle position - Throttle Sensor Position Throttle sensor positioning - Throttle Sensor Position #2 Throttle sensor positioning #2 - Throttle Motor DUTY Throttle motor - O2S B1 S2 Heated oxygen sensor output Performing 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 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 a continual deviation of short-term fuel trim from central valve Fuel System Status (Bank 1) Fuel system status - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using A/F 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 A/F sensor, which used for fuel control malfunctioning
Fuel System Status (Bank 2) Fuel system status - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using A/F 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 A/F sensor, which used for fuel control malfunctioning
AF Lambda B1 S1 Feul trim at A/F sensor - AFS B1 S1 A/F sensor current - Catalyst Temp (B1S1) Estimated catalyst temperature (sensor 1) - Catalyst Temp (B1S2) Estimated catalyst temperature (sensor 2) - Sub O2S Impedance B1S2 Sub heated oxygen sensor impedance (sensor 2) - 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 turned off Closed Throttle Position SW Closed throttle position switch - A/C Signal A/C signal - Neutral Position SW Signal Park/Neutral Position (PNP) switch signal - Electrical Load Signal Electrical load signal - Stop Light Switch Stop light switch - Immobilizer Communication Immobilizer communication OFF: Communication malfunctioning, or engine immobilizer system set Fuel Cut Condition Fuel cut condition - Battery Voltage Battery voltage - Atmosphere Pressure Atmosphere pressure - EVAP Purge VSV EVAP Purge VSV - Fuel Pump/Speed Status Fuel pump/speed status - VVT Control Status (Bank 1) VVT control status - Vacuum Pump Key-off EVAP system leak detection pump status - EVAP System Vent Valve Key-off EVAP system vent valve status - Electric Fan Motor Electric fan motor - TC and TE1 TC and CG (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 VVT Aim Angle (Bank 1) VVT aim angle (bank 1) VVT duty signal value during intrusive operation VVT Change Angle (Bank 1) VVT angle - VVT OCV Duty (Bank 1) VVT OCV operation duty - Idle Fuel Cut Fuel cut idle ON' when throttle valve fully closed and engine speed over 3, 500 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 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 - Catalyst OT MF F/C Catalyst overhead misfire prevention fuel cut availability Service data Cat OT F/C History Catalyst overhead misfire prevention fuel cut history Service data Cat OT MF FC Cylinder #1 Display of fuel cut operation in No. 1 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF FC Cylinder #2 Display of fuel cut operation in No. 2 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF FC Cylinder #3 Display of fuel cut operation in No. 3 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF FC Cylinder #4 Display of fuel cut operation in No. 4 cylinder (if certain level of misfire malfunction is detected) - 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 - Warm-up Cycle Cleared DTC Warm-up cycle after DTC cleared -