SFI SYSTEM (w/o Electronic Throttle Control 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 running or stopped, whether the air fuel ratio was lean or rich, and other data recorded at the time of a malfunction.

      Tech Tips

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


    • A0136RAE35

      The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using an intelligent tester, 5 separate sets of freeze frame data can be checked.


      • 3 data sets before the DTC was stored.

      • 1 data set when the DTC was stored.

      • 1 data set after the DTC was 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/Range Diagnostic Note
    CALC Load Calculated load Calculated load by ECM
    MAP Intake manifold pressure -
    Engine SPD Engine speed -
    Coolant Temp Engine coolant temperature

    If -40°C (-40°F), sensor circuit open

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

    If -40°C (-40°F), sensor circuit open

    If 140°C (284°F), sensor circuit shorted
    IDL SIG Idle signal -
    Vehicle SPD Vehicle speed Speed indicated on speedometer
    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
    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


    • OLDRIVE: Open loop due to driving conditions (fuel enrichment)


    • OLFAULT: Open loop due to detected system fault


    • CLFAULT: Closed loop but heated oxygen sensor, which is used for fuel control, malfunctioning
    FC IDL Idle fuel cut ON: when throttle valve fully closed and engine speed over 2800 rpm
    Starter SIG Starter switch (STA) signal -
    A/C SIG Air conditioning signal -
    Elect Load SIG Electrical load signal -
    Stop Light SW Stop light switch -
    PS Oil Press SW Power Steering signal This signal status usually ON until ignition switch turned off
    FC TAU Fuel cut TAU (Fuel cut during very light load) Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete
    Engine Run Time Accumulated engine running time -