SFI SYSTEM (w/ EGR 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 other data recorded at the time of a malfunction.

      Tech Tips

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


    • A01JAFTE01

      The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the intelligent tester, 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 the malfunction. The data may assist in identifying the cause of the malfunction, and judging whether it was temporary or not.

  2. LIST OF FREEZE FRAME DATA

    Tester Display Measurement Item Diagnostic Note
    Vehicle Speed Vehicle speed Speed indicated on speedometer
    Engine Speed Engine speed -
    Calculate Load Calculated load by ECM -
    Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount
    MAF Air flow rate from mass air flow meter sub-assembly

    If value approximately 0.0 gm/sec:


    • Mass air flow meter sub-assembly power source circuit open


    • VG circuit open or short

    If value 271.0 gm/sec or more:


    • E2G circuit open
    Atmosphere Pressure Atmosphere pressure -
    MAP Intake manifold pressure -
    Coolant Temp Engine coolant temperature

    • If value -40°C (-40°F): sensor circuit open


    • If value 140°C (284°F): sensor circuit shorted
    Intake Air Intake air temperature

    • If value -40°C (-40°F): sensor circuit open


    • If value 140°C (284°F): sensor circuit shorted
    Engine Run Time Engine run time -
    Initial Engine Coolant Temp Initial engine coolant temperature Service data
    Initial Intake Air Temp Initial intake air temperature Service data
    Battery Voltage Battery voltage -
    Throttle Sensor Volt % Throttle sensor positioning Recognition value for throttle opening angle on ECM
    Throttl Sensor #2 Volt % Absolute throttle sensor positioning #2 Recognition value for throttle opening angle on ECM
    Throttle Sensor Position Throttle sensor positioning Recognition value for throttle opening angle on ECM
    Throttle Motor DUTY Throttle actuator -
    Injector (Port) Injection direction for cylinder 1 -
    Injection Volum (Cylinder1) Injection volume (Cylinder 1) Quantity of fuel injection volume for 10 times
    Fuel Pump/Speed Status Fuel pump/status Active Test support data
    EVAP (Purge) VSV Purge VSV control duty ratio Order signal from ECM
    Evap Purge Flow Ratio of evaporative purge flow to intake air volume Service data
    Purge Density Learn Value Learning value of purge density Service data
    EVAP Purge VSV Purge VSV status for EVAP control Active Test support data
    Purge Cut VSV Duty Purge cut vacuum switching valve duty ratio -
    Target Air-Fuel Ratio Ratio compared to stoichiometric level -
    AF Lambda B1 S1 Short-term fuel trim associated with bank 1 sensor 1 -
    AFS Voltage B1 S1 Air fuel ratio sensor output voltage for bank 1 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 sensors
    AFS Current B1 S1 Air fuel ratio sensor output current for bank 1 sensor 1 Value becomes higher when fuel-cut executed under high engine speed
    A/F Heater Duty #1 Air fuel ratio sensor heater duty ratio -
    O2S B1 S2 Heated oxygen sensor output voltage for bank 1 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 sensors
    O2S Impedance B1S2 Heated oxygen sensor impedance (bank 1 sensor 2) -
    O2 Heater B1S2 Heated oxygen sensor operation -
    O2 Heater Curr Val B1S2 Heated oxygen sensor current -
    Short FT #1 Short-term fuel trim of bank 1 Short-term fuel compensation used to maintain air fuel ratio at stoichiometric air fuel ratio
    Long FT #1 Long-term fuel trim of bank 1 Overall fuel compensation carried out in long-term to compensate continual deviation of short-term fuel trim from central value
    Total FT #1 Total fuel trim -
    Fuel System Status #1 Fuel system status (bank 1)

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


    • CL (Closed Loop): Using air fuel ratio 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 air fuel ratio sensor, which is used for fuel control, malfunctioning
    Fuel System Status #2 Fuel system status (bank 2) (Unused)

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


    • CL (Closed Loop): Using air fuel ratio 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 air fuel ratio sensor, witch is used for fuel control, malfunctioning
    IGN Advance Ignition timing advance for cylinder 1 -
    Knock Feedback Value Feedback value of knocking Service data
    Knock Correct Learn Value Correction learning value of knocking Service data
    Target EGR Position Target EGR position -
    EGR Step Position EGR step position -
    VVT Control Status #1 VVT control (bank 1) status Active Test support data
    Catalyst Temp B1 S1 Catalyst temperature (associated sensor 1) -
    Catalyst Temp B1 S2 Catalyst temperature (associated sensor 2) -
    Closed Throttle Position SW Closed throttle position switch -
    Fuel Cut Condition Fuel cut condition ON or OFF -
    TC Terminal TC terminal status -
    Time after DTC Cleared Time since DTCs cleared -
    Distance from DTC Cleared Distance traveled since DTCs cleared -
    Warmup Cycle Cleard DTC Warm-up cycles since DTCs cleared Number of warm-up cycles since DTCs cleared
    Dist Batt Cable Disconnect Accumulated distance from battery cable disconnected -
    IG OFF Elapsed Time Cumulative time after power switch off -
    TC and TE1 TC and CG (TE1) terminals of DLC3 Active Test support data
    Ignition Trig. Count Ignition counter to calculated misfire count -
    Cylinder #1 Misfire Count Misfire count for cylinder 1 -
    Cylinder #2 Misfire Count Misfire count for cylinder 2 -
    Cylinder #3 Misfire Count Misfire count for cylinder 3 -
    Cylinder #4 Misfire Count Misfire count for cylinder 4 -
    All Cylinders Misfire Count All cylinders misfire count -
    Misfire RPM Average engine speed when misfire occurs -
    Misfire Load Average engine load when misfire occurred -
    Catalyst OT MF F/C Catalyst over temperature misfire prevention F/C not available -
    Cat OT MF F/C History Catalyst over temperature misfire prevention F/C history -
    Cat OT MF F/C Cylinder#1 Catalyst over temperature misfire prevention #1 -
    Cat OT MF F/C Cylinder#2 Catalyst over temperature misfire prevention #2 -
    Cat OT MF F/C Cylinder#3 Catalyst over temperature misfire prevention #3 -
    Cat OT MF F/C Cylinder#4 Catalyst over temperature misfire prevention #4 -
    Electric Fan Motor Electric cooling fan motor Active Test support data
    Idle Fuel Cut Prohibit Prohibition of fuel cut at idle -
    Idle Fuel Cut Fuel cut idle ON: When throttle valve fully closed and engine speed over 2800 rpm
    FC TAU FC TAU Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete
    Communication with HV Status of the communication with power management control ECU -
    Communication with Brake Status of the communication with skid control ECU -
    Comm with Air Conditioner Status of the communication with air conditioning amplifier assembly -
    Requested Engine Torque Requested engine torque Flag information for hybrid vehicle
    HV Target Engine Speed HV target engine speed Flag information for hybrid vehicle
    Actual Engine Torque Actual engine torque Flag information for hybrid vehicle
    Engine Run Time Engine run time Flag information for hybrid vehicle
    Request Engine Run Time Request engine run time Flag information for hybrid vehicle
    Judge Time Engine Ignition Judgment time engine ignition Flag information for hybrid vehicle
    Judge Time Engine Output Judgment time for time until engine output Flag information for hybrid vehicle
    ISC Learning Idle speed control learning Flag information for hybrid vehicle
    F/C for Engine Stop Req Fuel cut for engine stop request Flag information for hybrid vehicle
    Engine Independent Engine independent operation Flag information for hybrid vehicle
    Racing Operation Racing operation Flag information for hybrid vehicle
    Request Warm-up Request engine warm up Flag information for hybrid vehicle
    Engine Independent Control Engine independent control operation Flag information for hybrid vehicle
    Elec Water Pump Target Spd Engine water pump assembly target speed -
    Elec Water Pump Spd Engine water pump assembly speed -
    ISC Learning Value Idle speed control leaning value Flag information for hybrid vehicle