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 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 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 of the cause of the malfunction, and in judging whether it was temporary or not.
- 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.
- LIST OF FREEZE FRAME DATA FREEZE FRAME DATA TABLE
Tester Display Measurement Item Diagnostic Note Injector (Port) Injection period of No. 1 cylinder - IGN Advance Ignition advance - 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
Engine Speed Engine speed - Vehicle Speed 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 shorted2nd Air System Status Second air system status - Air-Fuel Ratio Ratio compared to stoichiometric level - Purge Density Learn Value Learning value of purge density - EVAP Purge Flow Ratio of evaporative purge flow to intake air volume - EVAP (Purge) VSV EVAP purge VSV duty ratio - Knock Correct Learn Value Correction learning value of knocking - Knock Feedback Value Feedback value of knocking - Accelerator Position No. 1 Absolute accelerator pedal position No. 1 - Accelerator Position No. 2 Absolute accelerator pedal position No. 2 - Throttle Position Absolute throttle position - Throttle Sensor Position Throttle sensor positioning - Throttle Sensor Position #2 Absolute throttle sensor positioning #2 - Throttle Motor Throttle actuator - O2S B1 S2 Heated oxygen sensor output voltage 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 sensor O2S B2 S2 Heated oxygen sensor output voltage 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 sensor AFS B1 S1 Air fuel ratio sensor output voltage 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 sensor AFS B2 S1 Air fuel ratio sensor output voltage 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 sensor AFS B2 S1 Air fuel ratio sensor current - Total FT #1 Total fuel trim (bank 1) - Total FT #2 Total fuel trim (bank 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 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 System Status (Bank 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 System Status (Bank 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 - Tester Display Measurement Item Diagnostic Note O2FT B2 S2 Fuel trim at heated oxygen sensor - AF FT B1 S1 Fuel trim at air fuel ratio sensor - AFS B1 S1 Air fuel ratio sensor current - AF FT B2 S1 Fuel trim at air fuel ratio sensor - Catalyst Temp (B1 S1) Estimated catalyst temperature (bank 1 sensor 1) - Catalyst Temp (B2 S1) Estimated catalyst temperature (bank 2 sensor 1) - Catalyst Temp (B1 S2) Estimated catalyst temperature (bank 1 sensor 2) - Catalyst Temp (B2 S2) Estimated catalyst temperature (bank 2 sensor 2) - Sub O2S Impedance B1S2 Sub heated oxygen sensor impedance (bank 1 sensor 2) - Sub O2S Impedance B2S2 Sub heated oxygen sensor impedance (bank 2 sensor 2) - Initial Engine Coolant Temp Initial engine coolant temperature - Initial Intake Air Temp Initial intake air temperature - Injection Volume (Cylinder 1) Injection volume - Air pump pressure (absolute) Air pump pressure (absolute) - Air Pump Pulsation Pressure Air pump pulsation pressure - Air Pump2 Pressure (Absolute) Air pump 2 pressure (absolute) - Air Pump2 Pulsation Pressure Air pump 2 pulsation pressure - ACC Relay ACC relay status - Starter Relay Starter relay status - Starter Signal Starter switch signal - Starter Control Starter switch status - Power Steering Switch Power steering switch - Power Steering Signal Power steering signal (history) - Closed Throttle Position SW Closed throttle position switch - A/C Signal A/C signal - Neutral Position SW Signal Park/neutral position switch signal - Electrical Load Signal Electrical load signal - Stop Light Switch Stop light switch - Fuel Cut Condition Fuel cut condition - Battery Voltage Battery voltage - Atmosphere Pressure Atmosphere pressure - Secondary Air Control VSV Secondary air injection system status - ACIS VSV VSV for Acoustic control induction system - ACT VSV A/C cut status for Active Test - VVT Control Status (Bank 2) VVT control status - EVAP Purge VSV EVAP Purge VSV - Fuel Pump/Speed Status Fuel pump/speed status - VVT Control Status (Bank 1) VVT control status - Vacuum Pump Key-off EVAP system leak detection pump status Refer to EVAP SYSTEM EVAP System Vent Value Key-off EVAP system vent valve status - TC and TE1 TC and CG (TE1) terminals of DLC3 - AI Operation Prohibit Secondary air injection system operation prohibit - Engine Speed of Cyl #1 Engine speed for cylinder 1 - Engine Speed of Cyl #2 Engine speed for cylinder 2 - Engine Speed of Cyl #3 Engine speed for cylinder 3 - Engine Speed of Cyl #4 Engine speed for cylinder 4 - Engine Speed of Cyl #5 Engine speed for cylinder 5 - Engine Speed of Cyl #6 Engine speed for cylinder 6 - Av Engine Speed of All Cyl Engine speed for all cylinders - VVT Aim Angle (Bank 1) VVT aim angle - VVT Change Angle (Bank 1) VVT change angle - VVT OCV Duty (Bank 1) VVT OCV operation duty - VVT Aim Angle (Bank 2) VVT aim angle - VVT Change Angle (Bank 2) VVT change angle VVT OCV Duty (Bank 2) VVT OCV operation duty - Idle Fuel Cut Fuel cut idle ON: when throttle valve fully closed and engine speed over 3500 rpm FCTAU Fuel cut during very light load Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete Ignition Ignition counter - Cylinder #1 Misfire Rate Cylinder #1 misfire Only displayed during idling Cylinder #2 Misfire Rate Cylinder #2 misfire Only displayed during idling Cylinder #3 Misfire Rate Cylinder #3 misfire Only displayed during idling Cylinder #4 Misfire Rate Cylinder #4 misfire Only displayed during idling Cylinder #5 Misfire Rate Cylinder #5 misfire Only displayed during idling Cylinder #6 Misfire Rate Cylinder #6 misfire Only displayed during idling All Cylinders Misfire Rate 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) - Cat OT MF F/C Cylinder#5 Display of fuel cut operation in No. 5 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#6 Display of fuel cut operation in No. 6 cylinder (if certain level of misfire malfunction is detected) - Received MIL from ECT MIL status - Engine Run Time Accumulated engine running time - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance from DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared -