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 running or stopped, 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 of the cause of the malfunction, and in judging whether it was temporary or not.
- LIST OF FREEZE FRAME DATA FREEZE FRAME DATA REFERENCE
LABEL (Tester Display) Measure Item/Range Diagnostic Note Vehicle Speed Vehicle speed Speed indicated on speedometer Engine Speed Engine speed - Calculate Load Calculate load Calculated load by ECM Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount MAF Mass air flow volume If value approximately 0.0 g/sec: - Mass air flow meter power source circuit open or short
- VG circuit open or short
If value 160.0 g/sec. or more:- E2G circuit open
MAF#1 Mass air for volume (bank 1) - MAF #2 Mass air for volume (bank 2) - Atmosphere Pressure Atmospheric pressure - Coolant Temp Engine coolant temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (258°F), sensor circuit shortedIntake Air Intake air temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (258°F), sensor circuit shortedIntake Air #1 Intake air temperature (bank 1) - Intake Air #2 Intake air temperature (bank 2) - Engine Run Time Accumulated engine running 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 (APP) No. 1 - Accel Sens. No. 2 Volt % APP No. 2 - Throttle Sensor Volt % Throttle sensor positioning Absolute throttle position Read value with engine switch on (IG) (Do not start engine) Throttl Sensor #2 Volt % Absolute throttle sensor positioning #2 Read value with engine switch on (IG) (Do not start engine) Throttle Sensor Position Throttle sensor positioning - Fuel Press Fuel Pressure - Injector (Port) Port injector - Injection Volum (Cylinder 1) Injection volume - Fuel Pump Speed Control F/PMP relay status - Fuel Pump/Speed Status Fuel pump/speed status - Vacuum Pump Key-off EVAP system pump status - Fuel Pressure Target Value Target fuel pressure - Fuel Pump Duty (D4) Fuel pump duty (D4) - High Pres FP Duty High pressure fuel pump duty - HP FP Discharge Rate High pressure fuel pump discharge rate (bank 1) - HP FP Discharge Rate 2 High pressure fuel pump discharge rate (bank 2) - Injection Way Injection mode - Injection Switching Status Prohibition of changing the D-4S injection method - Injection Timing (D4) Injection timing (D4) - Injection Time (D4) Injection time (D4) - EVAP (Purge) VSV EVAP purge VSV duty ratio - Evap Purge Flow Purge flow - Purge Destiny Learn Value Learning value of purge density - Vapor Pressure Pump Vapor pressure - Vapor Pressure (Calculated) Vapor pressure (calculated) - EVAP System Vent Value Key-off EVAP system vent valve status - EVAP Purge VSV Purge VSV VSV for EVAP controlled by ECM (ground side duty control) Target Air-Fuel Ratio Air-fuel ratio - AF Lambda B1S1 Fuel trim at A/F sensor - AF Lambda B2 S1 Fuel trim at A/F sensor - AF Voltage B1 S1 A/F sensor output voltage 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 AF Voltage B2 S1 A/F sensor output voltage 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 AF Current B1 S1 A/F sensor output current Performing Control the Injection Volume or Control the Injection Volume for A/F sensor function of Active Test enables technician to check current output of sensor AF Current B2 S1 A/F sensor output current Performing Control the Injection Volume or Control the Injection Volume for A/F sensor function of Active Test enables technician to check current output of sensor O2S B1 S2 Heated oxygen sensor output voltage 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 B2 S2 Heated oxygen sensor output voltage 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 Short FT #1 Short-term fuel trim (bank 1) Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #1 Long-term fuel trim (bank 1) Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve Total FT #1 Total fuel trim (bank 1) - Short FT #2 Short-term fuel trim (bank 2) Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #2 Long-term fuel trim (bank 2) Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve Total FT #2 Total fuel trim (bank 2) - 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 used for fuel control malfunctioning
Fuel System Status #2 Fuel system status (bank 2) - 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 used for fuel control malfunctioning
IGN Advance Ignition advance - Knock Feedback Value Feedback value of knocking - Knock correct Learn Value Correction learning value of knocking - ACIS VSV ACIS VSV status - Catalyst Temp B1 S1 Catalyst temperature - Catalyst Temp B2 S1 Catalyst temperature - Catalyst Temp B1 S2 Catalyst temperature - Catalyst Temp B2 S2 Catalyst temperature - Starter Signal Starter signal - Starter Control Starter control - Starter Relay ST relay status - ACC Relay ACC relay 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 - Electrical Load Signal Electrical load 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 - Ignition Trig. Count Ignition counter - 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 - Cylinder #5 Misfire Count Cylinder #5 misfire - Cylinder #6 Misfire Count Cylinder #6 misfire - Cylinder #7 Misfire Count Cylinder #7 misfire - Cylinder #8 Misfire Count Cylinder #8 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. 2 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder #2 Display of fuel cut operation in No. 1 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) - Cat OT MF F/C Cylinder #5 Display of fuel cut operation in No. 5 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder #6 Display of fuel cut operation in No. 6 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder #7 Display of fuel cut operation in No. 7 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder #8 Display of fuel cut operation in No. 8 cylinder (if certain level of misfire malfunction is detected) - Electric Fan Motor Fan motor status - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 1500 RPM FC TAU FC TAU Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete