Freeze Frame Data
- DESCRIPTION
Freeze frame data record the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) 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 a 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 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 Measure 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 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, sensor circuit open
If 140°C or more, sensor circuit shortedIntake Air Intake air temperature If -40°C, sensor circuit open
If 140°C 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 (APP) No.1 - Accelerator Position No.2 Absolute APP No. 2 - Throttle Pos. Sensor Output Throttle sensor positioning - Throttle Sensor Position Throttle position - Throttle Sensor Position #2 Throttle sensor positioning #2 - Throttle Motor DUTY Throttle motor - O2S B1 S2 Heated oxygen sensor output Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of 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 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 (bank 1) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using A/F 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 A/F sensor, which used for fuel control malfunctioning
Fuel System Status (Bank 2) Fuel system status (bank 2) AF Lambda B1 S1 Fuel trim at A/F sensor - AFS B1 S1 A/F sensor output current for sensor 1 Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check current output of sensor Catalyst Temp (B1 S1) Estimated catalyst temperature (sensor 1) - Catalyst Temp (B1 S2) Estimated catalyst temperature (sensor 2) - Sub O2S Impedance B1 S2 Sub 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 Volum (Cylinder 1) Injection volume - ACC Relay ACC (Accessory) relay - Starter Relay Starter relay (STA) signal - Starter Signal Starter switch (STSW) signal - Starter Control Starter control (STAR) signal - Power Steering Switch Power steering signal - Power Steering Signal Power steering signal (history) Signal status usually ON until ignition switch turned to 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 ON: Communication normal Fuel Cut Condition Fuel cut condition ON: Any fuel cut operation executed Battery Voltage Battery voltage - Atmosphere Pressure Atmospheric pressure Equivalent to atmospheric pressure EVAP Purge VSV EVAP Purge VSV - Fuel Pump/Speed Status Fuel pump status - VVT Control Status (Bank 1) VVT control status - Vacuum Pump Key-off EVAP system leak detection pump status See EVAP SYSTEM 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 for cylinder 1 Output only when Check the Cylinder Compression performed using Active Test 51199 rpm: Not performed Active Test Engine Speed of Cyl #2 Engine rpm for cylinder 2 Output only when Check the Cylinder Compression performed using Active Test 51199 rpm: Not performed Active Test Engine Speed of Cyl #3 Engine rpm for cylinder 3 Output only when Check the Cylinder Compression performed using Active Test 51199 rpm: Not performed Active Test Engine Speed of Cyl #4 Engine rpm for cylinder 4 Output only when Check the Cylinder Compression performed using Active Test 51199 rpm: Not performed Active Test Av Engine Speed of All Cyl Engine rpm for all cylinders Output only when Check the Cylinder Compression performed using Active Test 51199 rpm: Not performed Active Test VVT Aim Angle (Bank 1) VVT aim angle (bank 1) - VVT Change Angle (Bank 1) VVT change angle (bank 1) - 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 - 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 Cleard DTC Warm-up cycle after DTC cleared -