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. The intelligent tester displays freeze frame data recorded at five different points: 1) 3 times before the DTC is set, 2) once when the DTC is set, and 3) once after the DTC is set. The data can be used to simulate the vehicle's condition around the time of the malfunction. The data may be helpful in determining the cause of a malfunction. It may also be helpful in determining whether a DTC is being caused by a temporary malfunction.
The ECM records engine conditions in the from 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.
- LIST OF FREEZE FRAME DATA LIST OF FREEZE FRAME DATA
LABEL (Intelligent Tester Display) Measure Item/Range Diagnostic Note IGN ADVANCE Ignition advance - CALC LOAD Calculate load Calculated load by ECM (Included in HV Control ECU) VEHICLE LOAD Vehicle load - MAF Mass air flow volume If value approximately 0.0 g/s: - Mass air flow meter power source circuit open or short
- VG circuit open or short
If value 160.0 g/s 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, sensor circuit open
If value 140°C, sensor circuit shortedINTAKE AIR Intake air temperature If value -40°C, sensor circuit open
If value 140°C, sensor circuit shortedAIR-FUEL PATIO Air-fuel ratio - AMBIENT TEMP Ambient temperature - PURGE DENSITY Learning value of purge density - 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 - 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 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 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) - 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
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
O2FT B1 S2 Fuel trim at heated oxygen sensor Same as SHORT FT #1 O2FT B2 S2 Fuel trim at heated oxygen sensor Same as SHORT FT #1 AF FT B1 S1 Fuel trim at A/F 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 - INI COOL TEMP Initial engine coolant temperature - INI INTAKE TEMP Initial intake air temperature - INJ VOL Injection volume - INJECTOR Injection period of No.1 cylinder - CTP SW Closed throttle position switch - 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 - VVT CTRL B2 VVT control status (bank 2) - EVAP (Purge) VSV EVAP Purge VSV - FUEL PUMP/SPD Fuel pump/speed status - VVT CTRL B1 VVT control status (bank 1) - TANK BYPASS VSV Tank bypass VSV - TC/TE1 TC and TE1 terminals of DLC3 - VVTL AIM ANGL#1 VVT aim angle (bank1) - VVT CHNG ANGL#1 VVT change angle (bank 1) - VVT OCV D B1 VVT OCV operation duty (bank 1) - VVTL AIM ANGL#2 VVT aim angle (bank 2) - VVT CHNG ANGL#2 VVT change angle (bank 2) - VVT OCV DUTY B2 VVT OCV operation duty (bank 2) - FC IDL Idle fuel cut ON: when throttle valve fully closed and engine speed over 1,500 RPM FC TAU 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 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 from DTC cleared - WU CYC DTC CLEAR Warm-up cycle after DTC cleared - VACUUM PUMP Vacuum pump ON: Operate EVAP VENT VAL EVAP system vent valve ON: Close FAN MOTOR Electric fan motor ON: Operate FUEL FILLER OPN Fuel filler opener ON: Open FVCV Fuel vapor-containment valve ON: Open REQ ENG TRQ Requested engine torque - HV TRGT ENG SPD HV target engine speed - ACT ENGINE TRQ Actual engine torque - EST ENGINE TRQ Estimated engine torque - ENG RUN TIME Engine run time - ENGINE RUN TIME Request engine run time - IGNITION TIME Judge time engine ignition - OUTPUT TIME Judge time engine output - FUEL. LEVEL Fuel level - ISC LEARNING ISC learning - FUEL CUT Fuel cut for engine stop request - INDPNDNT OPR Engine Independent operation - RACING Racing operation - WARM UP Request warm-up - INDPNDNT CNTRL Engine independent control - ISC LEARN VAL ISC learning control - FUEL LID Fuel lid - FUEL LID SW Fuel lid switch ON: Open MODEL CODE Identifying the model code MHU3## ENGINE TYPE Identifying the engine type 3MZFE CYLINDER NUMBER Identifying the cylinder number 6 DESTINATION Identifying the destination A (America) MODEL YEAR Identifying the model year 200# SYSTEM Identifying the engine system HV