Freeze Frame Data
- 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.
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.
- 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.
- 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.
- 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 Load calculated by ECM. Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount MAF Mass air flow volume If approximately 0.0 g/sec.: - MAF meter power source circuit open
- VG circuit open or short
If value 270.0 g/sec. or more:- E2G circuit open.
Atmosphere Pressure Atmospheric pressure - Coolant Temp Engine coolant temperature If -40°C (-40°F), sensor circuit open.
If 140°C (284°F) or more, sensor circuit shorted.Intake Air Intake air temperature If -40°C (-40°F), sensor circuit open.
If 140°C (284°F) or more, 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 % Accelerator pedal position No. 1 - Accel Sens. No. 2 Volt % Accelerator pedal position No. 2 - Throttle Sensor Volt % Throttle sensor position - Throttle Sensor #2 Volt % Throttle sensor position #2 - Throttle Sensor Position Throttle sensor positioning - Throttle Motor DUTY Throttle actuator - Throttle Position Throttle position For use when engine stall, starting problems or rough idle is present. ISC Flow Flow rate calculated using information from each sensor For use when engine stall, starting problems or rough idle is present. ISC Position Requested opening amount calculated using ISC control For use when engine stall, starting problems or rough idle is present. ISC Feedback Value ISC feedback compensation amount For use when engine stall, starting problems or rough idle is present. ISC Learning Value ISC learned compensation amount For use when engine stall, starting problems or rough idle is present. Electric Load Feedback Val Compensation flow rate according to electrical load For use when engine stall, starting problems or rough idle is present. Air Conditioner FB Val Compensation flow rate according to air conditioner load For use when engine stall, starting problems or rough idle is present. PS Feedback Val Compensation flow rate according to power steering load For use when engine stall, starting problems or rough idle is present. Low Revolution Control Low engine speed control operation state For use when engine stall, starting problems or rough idle is present. Neutral Control Neutral control operation state For use when engine stall, starting problems or rough idle is present. N Range Status*1 Shift lever N status For use when engine stall, starting problems or rough idle is present. Eng Stall Control FB Flow Intake air compensation flow rate For use when engine stall, starting problems or rough idle is present. Deposit Loss Flow Flow loss due to deposits For use when engine stall, starting problems or rough idle is present. Injector (Port) Injection period of No. 1 cylinder - Injection Volume (Cylinder 1) Injection volume (cylinder 1) The quantity of fuel injection volume for 10 times. Fuel Pump/Speed Status Fuel pump status - Vacuum Pump Key-off EVAP system leak detection pump status Refer to EVAP System. Refer to PROCEDURE - Step 1 . EVAP (Purge) VSV EVAP 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 System Vent Valve Key-off EVAP system vent valve status - EVAP Purge VSV VSV status for EVAP control - Purge Cut VSV Duty Purge cut VSV duty - Target Air-Fuel Ratio Ratio compared to stoichiometric level - AF Lambda B1S1 Fuel trim at A/F sensor - AFS Voltage B1S1 A/F 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 A/F 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 Heated oxygen sensor impedance for bank 1 sensor 2 - O2 Heater B1S2 Heated oxygen sensor heater - O2 Heater Curr Val B1S2 Heated oxygen sensor current for bank 1 sensor 2 - 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 a 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 to 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, used for fuel control, malfunctioning.
Fuel System Status #2 Fuel system status (bank 2) - OL (Open Loop): Has not yet satisfied conditions to go to 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, used for fuel control, malfunctioning.
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 Individual cylinder timing advance compensation amount (No. 1) For use when engine stall, starting problems or rough idle is present. Idle Spark Advn Ctrl #2 Individual cylinder timing advance compensation amount (No. 2) For use when engine stall, starting problems or rough idle is present. Idle Spark Advn Ctrl #3 Individual cylinder timing advance compensation amount (No. 3) For use when engine stall, starting problems or rough idle is present. Idle Spark Advn Ctrl #4 Individual cylinder timing advance compensation amount (No. 4) For use when engine stall, starting problems or rough idle is present. VVT Control Status #1 VVT control (bank 1) status - VVT Advance Fail VVT control failure status - Catalyst Temp B1S1 Estimated catalyst temperature (for Bank 1 Sensor 1) - Catalyst Temp B1S2 Estimated catalyst temperature (for Bank 1 Sensor 2) - Starter Signal Starter switch (STA) signal - Starter Control Starter switch status - Power Steering Signal Record Power steering switch status - Starter Relay Starter relay status - ACC Relay ACC relay status - Neutral Position SW Signal Park/neutral position (PNP) switch signal - Clutch Switch Clutch Switch - Stop Light Switch Stop light switch - A/C Signal A/C signal - Idle Up Signal Idle up signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition - Immobiliser Communication Immobiliser communication - TC Terminal TC terminal status - Time after DTC Cleared Cumulative time after DTCs cleared - Distance from DTC Cleared Accumulated distance after DTCs cleared - Warm up Cycle Cleared DTC Warm-up cycles after DTCs cleared - Dist Batt Cable Disconnect Total distance vehicle driven after battery cable disconnected - IG OFF Elapsed Time Cumulative time after ignition switch off - TC and TE1 TC and CG (TE1) terminals of DLC3 - Ignition Trig. Count Ignition counter to calculated misfire count - Cylinder #1 Misfire Count Cylinder #1 misfire - Cylinder #2 Misfire Count Cylinder #2 misfire - Cylinder #3 Misfire Count Cylinder #3 misfire - Cylinder #4 Misfire Count Cylinder #4 misfire - All Cylinders Misfire Count All cylinders misfire - Multi Cylinders Misfire Count Multiple cylinder misfire - Misfire RPM Engine speed when misfire occurred - Misfire Load Engine load when misfire occurred - Misfire Margin Margin to detect engine misfire - Catalyst OT MF F/C Catalyst over temperature misfire prevention F/C - Cat OT MF F/C History Catalyst over temperature misfire prevention F/C 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 For use when engine stall, starting problems or rough idle is present. Starter Count Number of times starter turned on after ignition switch turned to ON For use when engine stall, starting problems or rough idle is present. Run Dist of Previous Trip Distance driven during previous trip For use when engine stall, starting problems or rough idle is present. Engine Starting Time Time elapsed after engine started (interval between ignition switch ON and off) For use when engine stall, starting problems or rough idle is present. Previous Trip Coolant Temp Engine coolant temperature during previous trip For use when engine stall, starting problems or rough idle is present. Previous Trip Intake Temp Intake air temperature during previous trip For use when engine stall, starting problems or rough idle is present. Engine Oil Temperature Engine oil temperature (estimated temperature) For use when engine stall, starting problems or rough idle is present. Previous Trip Eng Oil Temp Engine oil temperature during previous trip For use when engine stall, starting problems or rough idle is present. Ambient Temp for A/C Ambient temperature For use when engine stall, starting problems or rough idle is present. Previous Trip Ambient Temp Ambient temperature during previous trip For use when engine stall, starting problems or rough idle is present. Engine Start Hesitation History of hesitation during engine start For use when engine stall, starting problems or rough idle is present. Low Rev for Eng Start History of low engine speed after engine start For use when engine stall, starting problems or rough idle is present. Minimum Engine Speed Minimum engine speed For use when engine stall, starting problems or rough idle is present. 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 at idle ON: when throttle valve fully closed and engine speed over 3500 rpm. FC TAU Fuel cut during very light load Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete. Immobiliser Fuel Cut Status of the immobiliser fuel cut - Electrical Load Signal 1 Electrical load signal - Electrical Load Signal 2 Electrical load signal - - *1: for Automatic Transaxle models