Sfi System Freeze Frame Data

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141
  1. DESCRIPTION

  1. LIST OF FREEZE FRAME DATA

Sfi System -- Freeze Frame Data



DESCRIPTION
  1. 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.
    HINT:
    If it is impossible to replicate the problem even though a DTC is detected, confirm the freeze frame data.

  1. Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System  Freeze Frame Data
    The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, 5 separate sets of freeze frame data can be checked.
    1. 3 data sets before the DTC was stored.
    2. 1 data set when the DTC was stored.
    3. 1 data set after the DTC was stored.
    1. 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.

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 (MAF) meter
If value approximately 0.0 gm/s:
  1. Mass air flow meter power source circuit open
  2. VG circuit open or short
If value 271.0 gm/s or more:
  1. E2G circuit open
Atmosphere Pressure
Atmospheric pressure
-
Coolant Temp
Engine coolant temperature
  1. If value -40°C (-40°F): sensor circuit open
  2. If value more than 135°C (275°F): sensor circuit shorted
Intake Air
Intake air temperature
  1. If value -40°C (-40°F): sensor circuit open
  2. If value more than 128°C (262°F): sensor circuit shorted
Engine Run Time
Engine run time
-
Initial Engine Coolant Temp
Initial engine coolant temperature
-
Initial Intake Air Temp
Initial intake air temperature
-
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 position
-
Throttl Sensor #2 Volt %
Absolute throttle sensor positioning #2
-
Throttle Sensor Position
Throttle sensor positioning
-
Throttle Motor Duty
Throttle motor
-
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
-
Vacuum Pump*3
Key-off EVAP system leak detection pump status
-
EVAP (Purge) VSV
EVAP (Purge) VSV control duty
Order signal from ECM
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*3
key-off EVAP system vent valve status
-
EVAP Purge VSV
VSV status for EVAP control
-
Purge Cut VSV Duty
Purge VSV duty
-
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
-
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
-
O2S B1S2
Heated oxygen sensor output voltage for bank 1 sensor 2
-
O2S Impedance B1S2
Heated oxygen sensor impedance (bank 1 sensor 2)
-
O2 Heater B1S2
Heated oxygen sensor heater
-
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 long-term to compensate continual deviation of short-term fuel trim from central value
Total FT #1
Total fuel trim of bank 1
-
Fuel System Status #1
Fuel system status (bank 1)
  1. OL (Open Loop): Has not yet satisfied conditions to go closed loop
  2. CL (Closed Loop): Using air fuel ratio sensor as feedback for fuel control
  3. OLDrive: Open loop due to driving conditions (fuel enrichment)
  4. OLFault: Open loop due to detected system fault
  5. 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)
-
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
-
VVT Control Status #1
VVT control (bank 1) status
-
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 switch signal
-
Neutral Position SW Signal*1
Park/neutral position switch status
-
Clutch Switch*2
Clutch switch
-
Stop Light Switch
Stop light switch status
-
A/C Signal
A/C switch status
-
Idle Up Signal
Idle up signal
-
Closed Throttle Position SW
Closed throttle position switch
-
Fuel Cut Condition
Fuel-cut condition
-
Immobiliser Communication
Immobiliser communication
OFF: Communication malfunctioning, or engine immobiliser system set
TC Terminal
TC terminal status
-
Time after DTC Cleared
Time since DTCs cleared
-
Distance from DTC Cleared
Distance traveled since DTCs cleared
-
Warmup Cycle Cleared 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*3
Cumulative time after ignition switch off
-
TC and TE1
TC and CG (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 for first misfire range
-
Misfire Load
Average engine load for first misfire range
-
Misfire Margin
Margin to detect engine misfire
Misfire detection margin
Catalyst OT MF F/C
Fuel cut to prevent catalyst from overheating during misfire
-
Cat OT MF F/C History
History of fuel cut to prevent catalyst from overheating during misfire
-
Cat OT MF F/C Cylinde r#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)
-
Electric Fan Motor
Electric cooling fan motor
-
Idle Fuel Cut
Fuel cut idle
Idle Fuel Cut = "ON" when throttle valve fully closed and engine speed over 2500 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
Electrical Load Signal 1
Electrical load signal 1
-
Electrical Load Signal 3
Electrical load signal 3
-
  1. *1: Automatic Transaxle only.
  2. *2: Manual Transaxle only.
  3. *3: Except for Mexico models.