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 replicate 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 an intelligent tester, 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 conditions 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.
- LIST OF FREEZE FRAME DATA LIST OF FREEZE FRAME DATA
LABEL (Intelligent Tester Display) Measure Item/Range Diagnostic Note INJECTOR Injector - IGN ADVANCE Ignition advance - CALC LOAD Calculate load Calculated load by ECM VEHICLE LOAD Vehicle load - MAF Mass air flow volume If value approximately 0.0 g/sec: - Mass air flow meter power source circuit open or short
- VG circuit open or short
If value 160.0 g/sec or more:
- E2G circuit open
ENGINE SPD Engine speed - VEHICLE SPD 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 Air-fuel ratio - PURGE DENSITY Learning value of purge density - EVAP PURGE FLOW Purge flow - EVAP PURGE VSV EVAP purge VSV duty ratio - KNOCK CRRT VAL Correction learning value of knocking - KNOCK FB VAL Feedback value of knocking - ACCEL POS #1 Absolute Accelerator Pedal Position (APP) No. 1 - ACCEL POS #2 Absolute APP No. 2 - THROTTLE POS Throttle position Read value with ignition switch ON (Do not start engine) THROTTLE POS Throttle sensor positioning Read value with ignition switch ON (Do not start engine) THROTTLE POS #2 Throttle sensor positioning #2 - THROTTLE MOT Throttle motor - O2S B1 S2 Heated oxygen sensor output voltage Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check voltage output of sensor O2S B2 S2 Heated oxygen sensor output voltage Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check voltage output of sensor AFS B1 S1 A/F sensor output voltage Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check voltage output of sensor AFS B2 S1 A/F sensor output voltage Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check voltage output of sensor AFS B2 S1 A/F sensor output current Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check current output of sensor TOTAL FT #1 Total fuel trim (Bank 1) - TOTAL FT #2 Total fuel trim (Bank 2) - SHORT FT #1 Short-term fuel trim (Bank 1) Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio LONG FT #1 Long-term fuel trim (Bank 1) 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 (Bank 2) Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio LONG FT #2 Long-term fuel trim (Bank 2) Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve FUEL SYS #1 Fuel system status (Bank 1) - OL (Open Loop): Has not yet satisfied conditions to go dosed 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 used for fuel control, malfunctioning
FUEL SYS #2 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
- 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 used for fuel control, malfunctioning
O2 FT B1 S2 Fuel trim at heated oxygen sensor - O2 FT B2 S2 Fuel trim at heated oxygen sensor - AF FT B1 S1 Fuel trim at A/F sensor - AFS B1 S1 A/F sensor output current Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check current output of sensor AF FT B2 S1 Fuel trim at A/F sensor - CAT TEMP B1 S1 Catalyst temperature - CAT TEMP B2 S1 Catalyst temperature - CAT TEMP B1 S2 Catalyst temperature - CAT TEMP B2 S2 Catalyst temperature - S O2S B1 S2 Sub heated oxygen sensor impedance - S O2S B2 S2 Sub heated oxygen sensor impedance - INI COOL TEMP Initial engine coolant temperature - INI INTAKE TEMP Initial intake air temperature - INJ VOL Injection volume - STARTER SIG Starter signal - PS SW Power steering signal - PS SIGNAL Power steering signal (history) This signal status usually ON until battery terminals disconnected CTP SW Closed throttle position switch - A/C SIG A/C signal - ELECT LOAD SIG Electrical load signal - STOP LIGHT SW Stop light switch - BATTERY VOLTAGE Battery voltage - ATM PRESSURE Atmospheric pressure - FUEL PMP SP CTL Fuel pump speed control status - ACIS CTRL B2 ACIS VSV status - ACT VSV A/C cut status - VVT CTRL B2 VVT control status - EVAP (Purge) VSV EVAP purge VSV VSV for EVAP controlled by ECM (ground side duty control) FUEL PUMP/SPD Fuel pump speed status - VVT CTRL B1 VVT control status - VACUUM PUMP Key-off EVAP system pump status - EVAP VENT VAL Key-off EVAP system vent valve status - TC/TE1 TC and TE1 terminals of DLC3 - ENG SPEED #1 Engine speed for cylinder 1 - ENG SPEED #2 Engine speed for cylinder 2 - ENG SPEED #3 Engine speed for cylinder 3 - ENG SPEED #4 Engine speed for cylinder 4 - ENG SPEED #5 Engine speed for cylinder 5 - ENG SPEED #6 Engine speed for cylinder 6 - ENG SPEED ALL Engine speed for all cylinders - VVTL AIM ANGL #1 VVT aim angle - VVT CHNG ANGL #1 VVT change angle - VVT OCV DUTY B1 VVT OCV operation duty - VVTL AIM ANGL #2 VVT aim angle - VVT CHNG ANGL #2 VVT change angle - VVT OCV DUTY B2 VVT OCV operation duty - FCIDL Idle fuel cut ON: when throttle valve fully closed and engine speed over 3,500 rpm FCTAU FC TAU Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete IGNITION Ignition - CYL #1 Cylinder #1 misfire rate Displayed in only idling CYL #2 Cylinder #2 misfire rate Displayed in only idling CYL #3 Cylinder #3 misfire rate Displayed in only idling CYL #4 Cylinder #4 misfire rate Displayed in only idling CYL #5 Cylinder #5 misfire rate Displayed in only idling CYL #6 Cylinder #6 misfire rate Displayed in only idling CYL ALL All cylinder misfire rate Displayed in only idling MISFIRE RPM Misfire RPM - MISFIRE LOAD Misfire load - MISFIRE MARGIN Margin to detect engine misfire - ENG RUN TIME Accumulated engine running time - TIME DTC CLEAR Cumulative time after DTC cleared - DIST DTC CLEAR Accumulated distance from DTC cleared - WU CYC DTC CLEAR Warm-up cycle after DTC clear -