СИСТЕМА SFI ДАННЫЕ ФИКСИРОВАННОГО НАБОРА ПАРАМЕТРОВ

  1. DESCRIPTION

    • Freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

      Tech Tips

      If it is impossible to replicate the problem even though a DTC is output, 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 can be checked.

      A00DUE0E41

      • 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 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 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 is displayed.
    Engine Speed Engine speed -
    Calculate Load Calculated load The load calculated by the ECM.
    MAF Mass air flow volume

    If the value is approximately 0.0 g/sec.:

    • The mass air flow meter power source circuit is open or shorted.

    • The VG circuit is open or shorted.

    If the value is 271.0 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) or higher, 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) or higher, 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 (APP) No. 1 -
    Accel Sens. No.2 Volt % Absolute APP No. 2 -
    Throttle Sensor Volt % Throttle position -
    Throttle Sensor #2 Volt % Throttle position sensor #2 -
    Throttle Sensor Position Throttle position sensor -
    Throttle Motor DUTY Throttle actuator -
    Injector (Port) Injection period of No. 1 cylinder -
    Injection Volum (Cylinder1) Injection volume -
    Fuel Pump/Speed Status Fuel pump/speed status -
    EVAP (Purge) VSV Purge VSV duty ratio -
    EVAP Purge VSV Purge VSV -
    IGN Advance Ignition advance -
    Knock Feedback Value Feedback value of knocking -
    Knock Correct Learn Value Learned knocking correction value -
    Starter Signal Starter 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 (PNP) switch signal -
    Stop Light Switch Stop light switch -
    A/C Signal A/C signal -
    Closed Throttle Position SW Closed throttle position switch -
    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 -
    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 1500 rpm.
    FC TAU Fuel cut during very light load Fuel cut is being performed under a very light load to prevent the engine combustion from becoming incomplete.