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 engine was warmed up or not, 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 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 the 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 condition 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 | Injection period of No. 1 cylinder | - |
| 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:
|
| 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), sensor circuit shorted |
| INTAKE AIR | Intake air temperature | If value -40°C (-40°F), sensor circuit open If value 140°C (284°F), sensor circuit shorted |
| FUEL PRESS | Fuel Pressure | - |
| AIR-FUEL RATIO | Air-fuel ratio | - |
| AMBIENT TEMP | Ambient temperature | - |
| PURGE DENSITY | Learning value of purge density | - |
| EVAP PURGE FLOW | Purge flow | - |
| EVAP PURGE VSV | 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 engine switch on (IG) (Do not start engine) |
| THROTTLE POS | Throttle sensor positioning | Read value with engine switch on (IG) (Do not start engine) |
| THROTTLE POS #2 | Throttle sensor positioning #2 | - |
| THROTTLE MOT | Throttle actuator | - |
| 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 |
| O2S B2 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 |
| AFS B2 S1 | A/F sensor output | Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor |
| AFS B2 S1 | A/F sensor current (bank 2 sensor 1) | 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 | - |
| TOTAL FT #2 | 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 |
| SHORT FT #2 | Short-term fuel trim | Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio |
| LONG FT #2 | 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 SYS #1 | Fuel system status (Bank 1) |
|
| FUEL SYS #2 | Fuel system status (Bank 2) |
|
| O2FT B1 S2 | Fuel trim at heated oxygen sensor | - |
| O2FT B2 S2 | Fuel trim at heated oxygen sensor | - |
| AF FT B1 S1 | Fuel trim at A/F sensor | - |
| AFS B1 S1 | A/F sensor current (bank 1 sensor 1) | 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 B1S1 | Catalyst temperature | - |
| CAT TEMP B2S1 | Catalyst temperature | - |
| CAT TEMP B1S2 | Catalyst temperature | - |
| CAT TEMP B2S2 | 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 | - |
| ING TIMMING D4 | Injection timing (D4) | - |
| FUEL PUMP D4 | Fuel pump duty (D4) | - |
| INJ TIME D4 | Injection timing (D4) | - |
| FP TARGET VAL | Target fuel pressure | - |
| FP DISCHARGE | High pressure fuel pump discharge rate | - |
| INJ WAY | Injection mode | - |
| INJ SWITCHING | Prohibition of changing the D-4S injection method | - |
| ACC RELAY | ACC relay | - |
| STARTER RELAY | Starter relay | - |
| STARTER SIG | Starter signal | - |
| STARTER CONTROL | Starter control | - |
| 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 SIGNAL | A/C signal | - |
| PNP SW [NSW] | Neutral position switch signal | - |
| ELECT LOAD SIG | Electrical load signal | - |
| STOP LIGHT SW | Stop light switch | - |
| ENG OIL PRES SW | Engine oil pressure switch signal | Always ON while engine is running |
| BATTERY VOLTAGE | Battery voltage | - |
| ATM PRESSURE | Atmospheric pressure | - |
| FUEL PMP SP CTL | Fuel pump speed control status | - |
| VVT CTRL B2 | VVT control status (bank 2) | - |
| EVAP (Purge) VSV | Purge VSV | - |
| A/C MAG CLUTCH | A/C magnetic clutch relay | - |
| FUEL PUMP/SPD | Fuel pump/speed status | - |
| VVT CTRL B1 | VVT control status (bank 1) | - |
| VACUUM PUMP | Key-off EVAP system leak detection pump status | - |
| EVAP VENT VAL | Key-off EVAP system vent valve status | - |
| FAN MOTOR | Electric fan motor status | - |
| TC/TE1 | TC and TE1 terminals of DLC3 | - |
| FC IDL | Idle fuel cut | ON: when throttle valve fully closed and engine speed over 1,500 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 | - |
| 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 only while idling |
| MISFIRE RPM | Misfire RPM | - |
| MISFIRE LOAD | Misfired load | - |
| MISFIRE MARGIN | Misfire monitoring | - |
| ENG RUN TIME | Accumulated engine running time | - |
| TIME DTC CLEAR | Cumulative time after DTC cleared | - |
| DIST DTC CLEAR | Accumulated distance after DTC cleared | - |
| WU CYC DTC CLEAR | Warm-up cycle after DTC cleared | - |