SFI SYSTEM FREEZE FRAME DATA


  1. 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 moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as the other data recorded at the time of a malfunction.

      Tech Tips

      If it is impossible to duplicate the problem even though a DTC is output, confirm the freeze frame data.


    • A00DUE0E31

      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 can be checked.


      • 3 data sets before the DTC is stored.

      • 1 data set when the DTC is stored.

      • 1 data set after the DTC is stored.


      • These data sets can be used to duplicate 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 in judging whether it was temporary or not.

  2. LIST OF FREEZE FRAME DATA

    Tester Display Measurement Item Diagnostic Note
    Vehicle Speed Vehicle speed The speed indicated on the speedometer.
    Engine Speed Engine speed -
    Calculate Load Calculated load The load calculated by the ECM.
    Vehicle Load Vehicle load The load percentage in terms of the maximum intake air flow amount.
    MAF Mass air flow volume

    If the value is approximately 0.0 g/sec.:


    • The Mass Air Flow (MAF) meter power source circuit is open.

    • VG circuit is open or shorted.

    If the value is 160.0 g/sec. or more:


    • The E2G circuit is open.
    Atmosphere Pressure Atmospheric pressure -
    Coolant Temp Engine coolant temperature

    If the value is -40°C (-40°F), the sensor circuit is open.

    If the value is 140°C (284°F), the sensor circuit is shorted.
    Intake Air Intake air temperature

    If the value is -40°C (-40°F), the sensor circuit is open.

    If the value is 140°C (284°F), the sensor circuit is shorted.
    Engine Run Time Accumulated engine running time -
    Initial Engine Coolant Temp Engine coolant temperature at engine start -
    Initial Intake Air Temp Intake air temperature at engine start -
    Battery Voltage Battery voltage -
    Accel Sens. No.1 Volt % Absolute accelerator pedal position according to accelerator position sensor No. 1 -
    Accel Sens. No.2 Volt % Absolute accelerator pedal position according to accelerator position sensor No. 2 -
    Throttle Sensor Volt % Throttle position sensor

    The throttle opening angle recognized by the ECM.

    Read the value with the ignition switch ON.
    Throttl Sensor #2 Volt % Throttle position sensor #2

    The throttle opening angle recognized by the ECM.

    Read the value with the ignition switch ON.
    Throttle Sensor Position Throttle position

    The calculated value based on VTA1.

    Read the value with the ignition switch ON.
    Throttle Motor DUTY Throttle actuator -
    Injector (Port) Injection period of No. 1 cylinder -
    Injection Volume (Cylinder 1) Injection volume The quantity of fuel injection volume for 10 times.
    Fuel Pump/Speed Status Fuel pump/speed status -
    EVAP (Purge) VSV Purge VSV duty ratio The order signal from the ECM.
    Evap Purge Flow Ratio of evaporative purge flow to intake air volume -
    Purge Density Learn Value Learned value of purge density -
    EVAP Purge VSV Purge VSV -
    Target Air-Fuel Ratio Air fuel ratio compared to stoichiometric level -
    AF Lambda B1S1 Fuel trim at air fuel ratio sensor -
    AFS Voltage B1S1 Air fuel ratio sensor (Sensor 1) output Performing the Control the Injection Volume or Control the Injection Volume for A/F Sensor function of the Active Test enables the technician to check the output voltage of the sensor.
    AFS Current B1S1 Air fuel ratio sensor (Sensor 1) output current -
    O2S B1S2 Heated oxygen sensor (Sensor 2) output Performing the Control the Injection Volume or Control the Injection Volume for A/F Sensor function of the Active Test enables the technician to check the output voltage of the sensor.
    Short FT #1 Short-term fuel trim Short-term fuel compensation is used to maintain the air fuel ratio at the stoichiometric air fuel ratio.
    Long FT #1 Long-term fuel trim Overall fuel compensation is carried out in the long-term to compensate for a continual deviation of the short-term fuel trim from the central value.
    Total FT #1 Total fuel trim -
    Fuel System Status #1 Fuel system status (Bank 1)

    • OL (Open Loop): Has not yet satisfied the conditions to go to closed loop.

    • CL (Closed Loop): Using the air fuel ratio sensor as feedback for fuel control.

    • OL DRIVE: Open loop due to driving conditions (fuel enrichment).

    • OL FAULT: Open loop due to a detected system fault.

    • CL FAULT: Closed loop but the air fuel ratio sensor, which is used for fuel control, is malfunctioning.
    Fuel System Status #2 Fuel system status (Bank 2) Not available.
    IGN Advance Ignition advance -
    Knock Feedback Value Feedback value of knocking -
    Knock Correct Learn Value Learned knocking correction value -
    VVT Control Status #1 VVT control status (Bank 1) -
    Catalyst Temp B1S1 Estimated catalyst temperature (Sensor 1) -
    Catalyst Temp B1S2 Estimated catalyst temperature (Sensor 2) -
    Starter Signal Starter switch signal -
    Power Steering Signal Record Power steering signal -
    Power Steer. Sig. Record Power steering signal (history) The signal status is usually ON until the cables are disconnected from the battery terminals.
    Neutral Position SW Signal Park/neutral position switch signal -
    Clutch Switch Clutch start switch signal -
    Stop Light Switch Stop light switch signal -
    A/C Signal Air conditioning signal -
    Closed Throttle Position SW Closed throttle position switch signal -
    Fuel Cut Condition Fuel cut condition -
    Immobiliser Communication Immobiliser communication -
    Electrical Load Signal Electrical load signal -
    Time after DTC Cleared Cumulative time after DTC cleared -
    Distance from DTC Cleared Total distance vehicle driven after DTC cleared -
    Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared -
    TC and TE1 TC and TE1 terminals of DLC3 -
    Ignition Trig. Count Ignition counter -
    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 -
    All Cylinders Misfire Count All cylinder misfire count -
    Misfire RPM Engine speed when misfire occurs -
    Misfire Load Engine load when misfire occurs -
    Misfire Margin Margin to detect engine misfire -
    Electric Fan Motor Electric fan motor -
    Idle Fuel Cut Idle fuel cut ON: When the throttle valve is fully closed and the engine speed is over 2000 rpm.
    FC TAU Fuel cut with very light load Fuel cut is being performed with a very light load to prevent incomplete engine combustion.