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Home >> Toyota >> 2011 >> Tacoma Base, 2D Pickup, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2TR-FE) (Diagnostics - Introduction) >> SFI System >> Freeze Frame Data (To 12/2010) >> Freeze Frame Data
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Freeze Frame Data

  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, it can help determine if the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.

    HINT: 

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

    The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, five separate sets of freeze frame data, including the data values at the time when the DTC was set, can be checked.

    Fig 1: Identifying Freeze Frame Data Graph
    GTY179147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • 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 of the cause of the malfunction, and in judging whether it was temporary or not.

  2. LIST OF FREEZE FRAME DATA 
    Techstream 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 If value approximately 0.0 gm/sec:
    • MAF meter power source circuit open
    • VG circuit open or short

    If value 271.0 gm/sec or more:
    • E2G circuit open
    Atmosphere Pressure Atmospheric 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 -
    Accel Sens. No. 1 Volt % Accelerator pedal position No. 1 -
    Accel Sens. No. 2 Volt % Accelerator pedal position No. 2 -
    Throttle Sensor Volt % Throttle valve opening percentage according to throttle position sensor Value calculated value based on the voltage at terminal VTA1
    Throttl Sensor #2 Volt % Throttle valve opening percentage according to throttle position sensor No. 2 Value calculated value based on the voltage at terminal VTA2
    Throttle Sensor Position Throttle sensor positioning Recognition value for throttle opening angle on ECM
    Throttle Motor DUTY Throttle actuator ETCS service data
    Throttle Position Throttle valve opening angle Reference:
    When the engine stalls, is difficult to start, or idles roughly
    ISC Flow Flow rate calculated from information from each sensor Reference:
    When the engine stalls, is difficult to start, or idles roughly
    ISC Position Target valve opening angle calculated from ISC control Reference:
    When the engine stalls, is difficult to start, or idles roughly
    ISC Feedback Value ISC feedback value Reference:
    When the engine stalls, is difficult to start, or idles roughly
    ISC Learning Value ISC learning value Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Electric Load Feedback Val Electrical load feedback value Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Air Conditioner FB Val Air conditioner load feedback value Reference:
    When the engine stalls, is difficult to start, or idles roughly
    PS Feedback Val Power steering load feedback value Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Low Revolution Control Status of low engine speed control Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Neutral Control N position control status for automatic transmission models Reference:
    When the engine stalls, is difficult to start, or idles roughly
    N Range Status Judgement for shift lever in N Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Eng Stall Control FB Flow Feedback value of intake air flow Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Deposit Loss Flow Deposit loss air flow rate Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Injector (Port) Injection period of No. 1 cylinder -
    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
    Vacuum Pump Key-off EVAP system leak detection pump status Active Test support data
    EVAP (Purge) VSV EVAP (Purge) VSV control duty -
    Evap Purge Flow Ratio of evaporative purge flow to intake air volume -
    Purge Density Learn Value Learning value of purge density -
    EVAP System Vent Valve Key-off EVAP system vent valve status -
    EVAP Purge VSV VSV status for EVAP control -
    Target Air-Fuel Ratio Ratio compared to stoichiometric level -
    AF Lambda B1S1 Fuel trim at air fuel ratio sensor -
    AFS Voltage B1S1 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 sensor
    AFS Current B1S1 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 heater duty ratio (for Bank 1) -
    O2S B1S2 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 sensor
    O2S Impedance B1S2 Sub heated oxygen sensor impedance (bank 1 sensor 2) -
    O2 Heater B1S2 Heated oxygen sensor heater (for Bank 1 Sensor 2) -
    O2 Heater Curr Val B1S2 Heated oxygen sensor current (for Bank 1 Sensor 2) -
    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 for continual deviation of short-term fuel trim from central value
    Total FT #1 Total fuel trim valve for fuel system -
    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 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, is malfunctioning
    Fuel System Status #2 Fuel system status (bank 2)
    Air pump pressure (absolute) Air pump pressure -
    Air Pump Pulsation Pressure Air pump pulsation damper -
    Secondary Air Control VSV Secondary air injection system status -
    2nd Air System Status Secondary system status -
    AI Test Secondary air injection system operation prohibit -
    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 -
    Idle Spark Advn Ctrl #1 Ignition timing advance value (for No. 1 cylinder) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Idle Spark Advn Ctrl #2 Ignition timing advance value (for No. 2 cylinder) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Idle Spark Advn Ctrl #3 Ignition timing advance value (for No. 3 cylinder) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Idle Spark Advn Ctrl #4 Ignition timing advance value (for No. 4 cylinder) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Actual VVT Angle #1 Actual VVT displacement angle (bank 1) -
    VVT Control Status #1 VVT control (bank 1) status -
    VVT Advance Fail Status of VVT advance fail -
    Catalyst Temp B1S1 Catalyst temperature (associated sensor 1) -
    Catalyst Temp B1S2 Catalyst temperature (associated sensor 2) -
    Starter Signal Starter signal (STA terminal input status) -
    Power Steering Signal Power steering signal -
    Neutral Position SW Signal Park/neutral position switch status For automatic transmission models
    Clutch Switch Clutch switch status For manual transmission models
    4WD SW 4WD switch status -
    Transfer L4 Transfer L4 switch status -
    Stop Light Switch Stop light switch status -
    A/C Signal A/C switch status -
    Closed Throttle Position SW Closed throttle position switch -
    Fuel Cut Condition Fuel-cut condition -
    Immobilizer Communication Immobilizer communication OFF: Communication malfunctioning, or engine immobilizer system set
    TC Terminal TC terminal status -
    Time after DTC Cleared Time since DTCs cleared -
    Distance from DTC Cleared Distance traveled since DTCs cleared -
    Warm-up Cycle Cleared DTC Warm-up cycles since DTCs cleared Number of warm-up cycles since DTCs cleared
    Dist Batt Cable Disconnect Distance after battery cable disconnected -
    IG OFF Elapsed Time TC and CG (TE1) terminals of DLC3 -
    TC and TE1 TC and TE1 terminals of DLC3 -
    Ignition Trig. Count Ignition counter to calculated misfire rate -
    Cylinder #1 Misfire Count Misfire count of cylinder 1 -
    Cylinder #2 Misfire Count Misfire count of cylinder 2 -
    Cylinder #3 Misfire Count Misfire count of cylinder 3 -
    Cylinder #4 Misfire Count Misfire count of 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 -
    Misfire Margin Margin to detect engine misfire When the variation in the engine speed is large and exceeds the misfire detection threshold, the misfire count starts. Misfire margin is a measure of how much the engine speed variation can increase with respect to the threshold before the engine is determined to be misfiring. A large value means there is a large margin for the engine speed to vary before the engine is determined to be misfiring.
    Catalyst OT MF F/C Catalyst overheat misfire prevention fuel cut function availability -
    Cat OT MF F/C History Catalyst overheat misfire prevention fuel cut function history -
    Cat OT MF F/C Cylinder#1 Display of fuel cut operation in No. 1 cylinder (if certain level of misfire malfunction is detected) -
    Cat OT MF F/C Cylinder#2 Display of fuel cut operation in No. 2 cylinder (if certain level of misfire malfunction is detected) -
    Cat OT MF F/C Cylinder#3 Display of fuel cut operation in No. 3 cylinder (if certain level of misfire malfunction is detected) -
    Cat OT MF F/C Cylinder#4 Display of fuel cut operation in No. 4 cylinder (if certain level of misfire malfunction is detected) -
    Engine Speed (Starter Off) Engine speed when starter off Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Starter Count Number of times starter turned on after ignition switch turned from off to ON Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Run Dist of Previous Trip Distance traveled during previous trip Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Engine Starting Time Engine run time (elapsed time from ignition switch ON to off) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Previous Trip Coolant Temp Coolant temperature of previous trip Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Previous Trip Intake Temp Intake air coolant temperature of previous trip Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Engine Oil Temperature Engine oil temperature (estimated) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Previous Trip Eng Oil Temp Engine oil temperature of previous trip (estimated) Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Ambient Temp for A/C Ambient temperature Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Previous Trip Ambient Temp Ambient temperature of previous trip Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Engine Start Hesitation History of instances of slow engine starts Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Low Rev for Eng Start History of low engine speed after engine starts Reference:
    When the engine stalls, is difficult to start, or idles roughly
    Minimum Engine Speed Minimum engine speed Reference:
    When the engine stalls, is difficult to start, or idles roughly
    ACT VSV A/C cut status for Active Test -
    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 during very light load) Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete
    Immobilizer Fuel Cut Status of the immobilizer fuel cut -
    Immobilizer Fuel Cut History Status of the immobilizer fuel cut history -
    Electrical Load Signal 1 Electrical load signal (ELS1 terminal input) -
    Electrical Load Signal 2 Electrical load signal (ELS2 terminal input) -
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