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 FREEZE FRAME DATA REFERENCE
Tester Display Measure Item Diagnostic Note Vehicle Speed Vehicle speed Speed indicated on speedometer Engine Speed Engine speed - 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
Atmosphere Pressure Atmospheric pressure Equivalent to atmospheric pressure 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 shortedEngine Run Time Accumulated engine running time - Initial Engine Coolant Temp Engine coolant temperature at engine start - Initial Intake Air Temp Intake air temperature at engine start - Battery Voltage Battery voltage - Accel Sens. No. 1 Volt % Absolute Accelerator Pedal Position (APP) No.1 - Accel Sens. No. 2 Volt % Absolute APP No. 2 - Throttle Sensor Volt % Throttle sensor positioning - Throttle Sensor #2 Volt % Throttle sensor positioning #2 - Throttle Sensor Position Throttle position - Throttle Motor DUTY Throttle motor - Injector (Port) Injection period of No. 1 cylinder - Injection Volum (Cylinder1) Injection volume - Fuel Pump/Speed Status Fuel pump status - Vacuum Pump Key-off EVAP system leak detection pump status See EVAP SYSTEM EVAP (Purge) VSV EVAP purge VSV duty ratio - Evap Purge Flow Ratio of evaporative purge flow to intake air volume - Purge Density Learn Value Learning value of purge density - EVAP System Vent Valve Key-off EVAP system vent valve status - EVAP Purge VSV EVAP Purge VSV - Target Air-Fuel Ratio Ratio compared to stoichiometric level - AF Lambda B1S1 Fuel trim at A/F sensor - Voltage B1S1 A/F sensor output Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor Current B1S1 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 O2S B1S2 Heated oxygen sensor output Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor O2S Impedance B1S2 Sub oxygen sensor impedance (sensor 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 value Total FT #1 Total fuel trim - Fuel System Status #1 Fuel system status #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 #2 Fuel system status #2 IGN Advance Ignition advance - Knock Feedback Value Feedback value of knocking - Knock Correct Learn Value Correction learning value of knocking - VVT Control Status #1 VVT control status - VVT Aim Angle #1 VVT aim angle - VVT Change Angle #1 VVT change angle - VVT OCV Duty #1 VVT OCV operation duty - Catalyst Temp (B1S1) Estimated catalyst temperature (sensor 1) - Catalyst Temp (B1S2) Estimated catalyst temperature (sensor 2) - Starter Signal Starter switch (STSW) signal - Starter Control Starter control (STAR) signal - Power Steering Signal Record Power steering signal - Starter Relay Starter relay (STA) signal - Power Steer. Sig. Record Power steering signal (history) Signal status usually ON until ignition switch turned to OFF ACC Relay ACC (Accessory) relay - Neutral Position SW Signal Park/Neutral Position (PNP) switch signal - Stop Light Switch Stop light switch - A/C Signal A/C signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition ON: Any fuel cut operation executed Immobilizer Communication Immobilizer communication OFF: Communication malfunctioning, or engine immobilizer system set ON: Communication normal Electrical Load Signal Electrical load signal - 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 - TC and TE1 TC and CG (TE1) terminals of DLC3 - Ignition Trig. Count 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 over temperature Misfire prevention fuel cut - Cat OT MF F/C History Catalyst over temperature Misfire prevention fuel cut history: - 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) - Electric Fan Motor Electric fan motor - 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 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