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.
Tech Tips
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, 5 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 judging whether it was temporary or not.
LIST OF FREEZE FRAME DATA
Label (Tester Display) |
Measurement 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 value approximately 0.0 gm/sec:
If value 271.0 gm/sec or more:
|
Atmosphere Pressure | Atmospheric pressure | - |
MAP | Intake manifold pressure | - |
Coolant Temp | Engine coolant temperature | If value -40°C (-40°F), sensor circuit open If value 140°C (284°F) or more, 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 |
Engine Run Time | Accumulated engine running time | - |
Initial Engine Coolant Temp | Initial engine coolant temperature | - |
Initial Intake Air Temp | Initial intake air temperature | - |
Battery Voltage | Battery voltage | - |
Throttle Sensor Volt % | Throttle position | - |
Throttl Sensor #2 Volt % | Throttle sensor positioning #2 | - |
Throttle Sensor Position | Throttle sensor positioning | - |
Throttle Motor DUTY | Throttle actuator | - |
Injector (Port) | Fuel injector assembly | - |
Injection Volum (Cylinder 1) | Injection volume | - |
Fuel Pump Speed Control | Fuel pump speed control status | - |
Fuel Pump/Speed Status | Fuel pump/speed status | - |
EVAP (Purge) VSV | EVAP purge VSV duty ratio | - |
Evap Purge Flow | Purge flow | - |
Purge Density Learn Value | Learning value of purge density | - |
EVAP Purge VSV | EVAP purge VSV | - |
Purge Cut VSV Duty | Purge cut VSV duty | - |
Target Air-Fuel Ratio | Target air fuel ratio | - |
AF Lambda B1S1 | Fuel trim at air fuel ratio sensor | - |
AF Lambda B2S1 | Fuel trim at air fuel ratio sensor | - |
AFS Voltage B1S1 | Air fuel ratio sensor output | Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of air fuel ratio sensor |
AFS Voltage B2S1 | Air fuel ratio sensor output | Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of air fuel ratio sensor |
AFS Current B1S1 | Air fuel ratio sensor current | - |
AFS Current B2S1 | Air fuel ratio sensor current | - |
A/F Heater Duty #1 | Air fuel ratio heater duty ratio | - |
A/F Heater Duty #2 | Air fuel ratio heater duty ratio | - |
O2S B1S2 | Heated oxygen sensor output | Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of heated oxygen sensor |
O2S B2S2 | Heated oxygen sensor output | Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of heated oxygen sensor |
O2 Heater B1S2 | Heated oxygen sensor heater | - |
O2 Heater B2S2 | Heated oxygen sensor heater | - |
O2 Heater Curr Val B1S2 | Heated oxygen sensor current | - |
O2 Heater Curr Val B1S2 | Heated oxygen sensor current | - |
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 | - |
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 value |
Total FT #2 | Total fuel trim | - |
Fuel System Status #1 | Fuel system status (Bank 1) |
|
Fuel System Status #2 | Fuel system status (Bank 2) |
|
IGN Advance | Ignition advance | - |
Knock Feedback Value | Feedback value of knocking | - |
Knock Correct Learn Value | Correction learning value of knocking | - |
Target EGR Position | Target EGR position | - |
EGR Step Position | EGR step position | - |
VVT Control Status #1 | VVT control status (bank 1) | - |
VVT Control Status #2 | VVT control status (bank 2) | - |
Catalyst Temp B1S1 | Catalyst temperature | - |
Catalyst Temp B2S1 | Catalyst temperature | - |
Catalyst Temp B1S2 | Catalyst temperature | - |
Catalyst Temp B2S2 | Catalyst temperature | - |
Closed Throttle Position SW | Closed throttle position switch | - |
Fuel Cut Condition | Fuel cut condition ON or OFF | - |
TC Terminal | TC terminal status | - |
Time after DTC Cleared | Cumulative time after DTC cleared | - |
Distance from DTC Cleared | Accumulated distance after DTC cleared | - |
Warmup Cycle Cleared DTC | Warm-up cycle after DTC cleared | - |
Dist Batt Cable Disconnect | Accumulated distance from battery cable disconnected | - |
IG OFF Elapsed Time* | Cumulative time after power switch off | - |
TC and TE1 | TC and TE1 terminals of DLC3 | - |
Ignition Trig. Count | Ignition count | - |
Cylinder #1 Misfire Count | Cylinder #1 misfire count | - |
Cylinder #2 Misfire Count | Cylinder #2 misfire count | - |
Cylinder #3 Misfire Count | Cylinder #3 misfire count | - |
Cylinder #4 Misfire Count | Cylinder #4 misfire count | - |
Cylinder #5 Misfire Count | Cylinder #5 misfire count | - |
Cylinder #6 Misfire Count | Cylinder #6 misfire count | - |
All Cylinders Misfire Count | All cylinder misfire count | - |
Misfire RPM | Misfire RPM | - |
Misfire Load | Misfired load | - |
Catalyst OT MF F/C | Catalyst over temperature misfire prevention F/C | - |
Cat OT MF F/C History | Catalyst over temperature misfire prevention F/C not available | - |
Cat OT MF F/C Cylinder#1 | Catalyst over temperature misfire prevention F/C history off | - |
Cat OT MF F/C Cylinder#2 | Catalyst over temperature misfire prevention F/C history off | - |
Cat OT MF F/C Cylinder#3 | Catalyst over temperature misfire prevention F/C history off | - |
Cat OT MF F/C Cylinder#4 | Catalyst over temperature misfire prevention F/C history off | - |
Cat OT MF F/C Cylinder#5 | Catalyst over temperature misfire prevention F/C history off | - |
Cat OT MF F/C Cylinder#6 | Catalyst over temperature misfire prevention F/C history off | - |
Electric Fan Motor | Electric fan motor (Cooling fan motor) | - |
Idle Fuel Cut Prohibit | Prohibition of fuel cut at idle | - |
Idle Fuel Cut | Idle fuel cut | ON: when throttle valve fully closed and engine speed over 1500 rpm |
FC TAU | FC TAU | Fuel cut being performed under very light load to prevent incomplete engine combustion |
Communication with HV | Status of the communication with power management control ECU | - |
Communication with Brake | Status of the communication with skid control ECU | - |
Comm with Air Conditioner | Status of the communication with air conditioning amplifier assembly | - |
Requested Engine Torque | Requested engine torque | Flag information for hybrid vehicle |
HV Target Engine Speed | HV target engine speed | Flag information for hybrid vehicle |
Actual Engine Torque | Actual engine torque | Flag information for hybrid vehicle |
Engine Run Time | Engine run time | Flag information for hybrid vehicle |
Request Engine Run Time | Request engine run time | Flag information for hybrid vehicle |
Judge Time Engine Ignition | Judge time for engine ignition | Flag information for hybrid vehicle |
Judge Time Engine Output | Judge time for time until engine output | Flag information for hybrid vehicle |
Fuel Level | Fuel level | Flag information for hybrid vehicle |
ISC Learning | ISC learning | Flag information for hybrid vehicle |
F/C for Engine Stop Req | Fuel cut for engine stop request | Flag information for hybrid vehicle |
Engine Independent | Engine independent operation | Flag information for hybrid vehicle |
Racing Operation | Racing operation | Flag information for hybrid vehicle |
Request Warm-up | Request engine warm up | Flag information for hybrid vehicle |
Engine Independent Control | Engine independently control operation | Flag information for hybrid vehicle |
ISC Learning Value | ISC learning value | Flag information for hybrid vehicle |
*: Euro-OBD