SFI SYSTEM FREEZE FRAME DATA


  1. DESCRIPTION


    • Read freeze frame data using an intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

      Tech Tips

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


    • A0117BHE18

      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 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 in judging whether it was temporary or not.

  2. LIST OF FREEZE FRAME DATA

    Tester Display Measurement Item/Range Diagnostic Note
    Vehicle Speed Vehicle speed Speed indicated on speedometer
    Engine Speed Engine speed -
    Calculate Load Calculated load by ECM -
    Atmosphere Pressure Atmosphere pressure -
    MAP Intake manifold pressure -
    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
    Ambient temperature Ambient temperature -
    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 No. 1 -
    Accel Sens. No.2 Volt % Absolute accelerator pedal position No. 2 -
    Throttle Sensor Volt % Throttle sensor -
    Throttle Sensor #2 Volt % Throttle sensor No. 2 -
    Throttle Sensor Position Throttle position sensor -
    Throttle Motor DUTY Throttle actuator -
    Injector (Port) Injection period of No. 1 cylinder -
    Injection Volume (Cylinder 1) Injection volume -
    Fuel Pump/Speed Status Fuel pump/speed status -
    EVAP (Purge) VSV Purge VSV duty ratio -
    Evap Purge Flow Ratio of evaporative purge flow to intake air volume -
    Purge Density Learn Value Learning value of purge density -
    EVAP Purge VSV Purge VSV -
    Target Air-Fuel Ratio Ratio compared to stoichiometric level -
    AF Lambda B1S1 Short-term fuel trim associated with sensor 1 -
    AFS Voltage B1S1 Air fuel ratio sensor output voltage for sensor 1 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 Current B1S1 A/F sensor current for sensor 1 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 B1 S2 Heated oxygen sensor output voltage for sensor 2 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
    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 for continual deviation of short-term fuel trim from central value
    Total FT #1 Total fuel trim -
    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


    • 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
    Fuel System Status (Bank 2) Fuel system status (Bank 2) Unused
    IGN Advance Ignition timing advance for No. 1 cylinder -
    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) -
    Catalyst Temp (B1 S1) Estimated catalyst temperature (sensor 1) -
    Catalyst Temp (B1 S2) Estimated catalyst temperature (sensor 2) -
    Starter Signal Starter switch (STSW) signal -
    Power Steering Signal Power Steering Signal -
    Power Steer. Sig. Record Power Steering Signal (history) Signal status usually ON until ignition switch is turned off
    Neutral Position SW Signal Park/neutral position switch status -

    Clutch Switch

    *1

    		 Clutch Switch -

    Reverse Switch

    *1

    		 Reverse Switch -
    Stop Light Switch Stop light switch -

    Shift Indication Enable

    *1

    		 Shift Indication Enable -
    A/C Signal A/C signal -
    Closed Throttle Position SW Closed throttle position switch -
    Fuel Cut Condition Fuel cut status -
    Immobiliser Communication Immobiliser status -
    Electrical Load Signal Electrical load signal -
    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 -
    TC and TE1 TC and TE1 terminals of DLC3 -
    Ignition Trig. Count Ignition counter to calculate misfire rate -
    Cylinder #1 Misfire Count No. 1 cylinder misfire count -
    Cylinder #2 Misfire Count No. 2 cylinder misfire count -
    Cylinder #3 Misfire Count No. 3 cylinder misfire count -
    All Cylinders Misfire Count All cylinders 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 Fuel cut idle ON: when throttle valve fully closed and engine speed over 1500 rpm
    FC TAU Fuel cut TAU (Fuel cut with very light load) Fuel cut being performed with very light load to prevent incomplete engine combustion

    MT Down Shift Indication

    *1

    		 MT Down Shift Indication -

    MT Up Shift Indication

    *1

    		 MT Up Shift Indication -

    *1: Only for manual transaxle