ECD 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, as well as 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.


    • A01CIMSE18

      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 Diagnostic Note
    Vehicle Speed Vehicle speed Speed indicated on speedometer
    Engine Speed Engine speed -
    Calculate Load Calculated load Calculated load by ECM
    MAF Mass air flow volume

    If approximately 0.0 gm/sec:


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

    • VG circuit is open or shorted

    If 160.0 gm/sec or more:


    • E2G circuit is open
    Atmosphere Pressure Atmosphere pressure -
    MAP Absolute pressure inside intake manifold -
    Coolant Temp Engine coolant temperature

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

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

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

    If 140°C (284°F), sensor circuit is shorted
    Intake Air Temp (Turbo) Intake air temperature after intercooler

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

    If 190°C (374°F) or more, 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 Position Accelerator pedal position sensor -
    Accel Sens. No.1 Volt % Accelerator pedal position No. 1 output voltage -
    Accel Sens. No.2 Volt % Accelerator pedal position No. 2 output voltage -
    Actual Throttle Position Actual throttle position -
    Diesel Throttle Learn Status Diesel throttle learn status -
    Throttle Motor DUTY Throttle actuator -
    Injection Volume Injection volume -
    Inj. FB Vol. for Idle Injection volume feedback value for idle speed control -
    Inj Vol Feedback Learning Injection volume feedback learning value -
    Injection Feedback Val #1 Injection volume correction for cylinder 1 -
    Injection Feedback Val #2 Injection volume correction for cylinder 2 -
    Injection Feedback Val #3 Injection volume correction for cylinder 3 -
    Injection Feedback Val #4 Injection volume correction for cylinder 4 -
    Pilot 1 Injection Period Pilot 1 injection period -
    Pilot 2 Injection Period Pilot 2 injection period -
    Main Injection Period Main injection period -
    After Injection period Post injection period -
    Pilot 1 Injection Timing Pilot 1 injection timing -
    Pilot 2 Injection Timing Pilot 2 injection timing -
    Main Injection Timing Main injection timing -
    After Injection Timing Post injection timing -
    Injector Memory Error EEPROM malfunction for injector assembly -
    Fuel Press Fuel pressure -
    Fuel Temperature Fuel temperature -
    Target Pump SCV Current Pump current target final value -
    EGR Lift Sensor Volt % Actual EGR valve position -
    EGR Close Lrn. Status EGR valve fully closed position learning status -
    VN Turbo Command VN turbo command -
    Exhaust Temperature B1S1 Exhaust temperature sensor for bank 1 sensor 1

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

    If 1000°C (1832°F), sensor circuit is shorted
    Exhaust Temperature B1S2 Exhaust temperature sensor for bank 1 sensor 2

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

    If 1000°C (1832°F), sensor circuit is shorted
    DPF Differential Pressure DPF differential pressure -
    DPF PM Block Particulate matter block -
    Catalyst Regeneration Switch DPF switch -
    Exhaust Brake Switch Exhaust brake switch -
    Starter Signal Starter signal -
    Clutch Switch Clutch switch -
    Stop Light Switch Stop light switch -
    A/C Signal Air conditioning 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 -
    PTO Switch Power take-off switch -
    Engine Warm Up Switch Warm up switch -
    ACT VSV Air conditioning cut operation -