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 duplicate 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 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.
- 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.
- LIST OF FREEZE FRAME DATA TESTER DISPLAY CHART
Tester Display Measurement Item Diagnostic Note Trouble Code Freeze DTC - Injector (Port) Injector - IGN Advance Ignition advance - Calculate Load Calculate load Calculated load by ECM Vehicle Load Vehicle load - MAF Mass air flow volume If value is approximately 0.0 g/s: - Mass air flow meter power source circuit open or shorted
- VG circuit open or shorted
If value is 271.0 g/s or more:- E2G circuit open
Engine Speed Engine speed - Vehicle Speed Vehicle speed Speed indicated on speedometer Coolant Temp Engine coolant temperature If value is -40°C (-40°F), sensor circuit open
If value is 140°C (284°F), sensor circuit shortedIntake Air Intake air temperature If value is -40°C (-40°F), sensor circuit open
If value is 140°C (284°F), sensor circuit shortedAir-Fuel Ratio Air-fuel ratio - Purge Density Learn Value Learning value of purge density - Evap Purge Flow Purge flow - EVAP (Purge) VSV EVAP purge VSV duty ratio - Knock Correct Learn Value Correction learning value of knocking - Knock Feedback Value Feedback value of knocking - Accelerator Position No. 1 Absolute Accelerator Pedal Position (APP) No. 1 - Accelerator Position No. 2 Absolute APP No. 2 - Throttle Position Throttle position Read value with ignition switch ON (Do not start engine) Throttle Sensor Position Throttle sensor positioning Read value with ignition switch ON (Do not start engine) Throttle Sensor Position #2 Throttle sensor positioning #2 Read value with ignition switch ON (Do not start engine) Throttle Motor Throttle motor - O2S B1 S2 Heated oxygen sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor O2S B2 S2 Heated oxygen sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor AFS B1 S1 A/F sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor AFS B2 S1 A/F sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor Total FT #1 Total fuel trim of bank 1 - Total FT #2 Total fuel trim of bank 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 a continual deviation of short-term fuel trim from central valve Short FT #2 Short-term fuel trim of bank 2 Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #2 Long-term fuel trim of bank 2 Overall fuel compensation carried out in long-term to compensate for a continual deviation of short-term fuel trim from central valve Fuel System Status (Bank 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
- OL DRIVE: Open loop due to driving conditions (fuel enrichment)
- OL FAULT: Open loop due to detected system fault
- CL FAULT: Closed loop but heated oxygen sensor, which used for fuel control malfunctioning
Fuel System Status (Bank 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
- OL DRIVE: Open loop due to driving conditions (fuel enrichment)
- OL FAULT: Open loop due to detected system fault
- CL FAULT: Closed loop but heated oxygen sensor, which used for fuel control malfunctioning
AF FT B1 S1 Fuel trim at A/F sensor - AF FT B2 S1 Fuel trim at A/F sensor - Catalyst Temp (B1 S1) Catalyst temperature - Catalyst Temp (B2 S1) Catalyst temperature - Catalyst Temp (B1 S2) Catalyst temperature - Catalyst Temp (B2 S2) Catalyst temperature - Initial Engine Coolant Temp Initial engine coolant temperature at engine start at engine start - Initial Intake Air Temp Initial intake air temperature - Injection Volume (Cylinder 1) Injection volume - SCV Angle Sensor (D4) SCV angle sensor - Fuel Pump Duty (D4) Fuel pump duty - Combustion Status (D4) Combustion status - Injection Timing (D4) Injection Time - Fuel Pressure Target Value Fuel pressure target value - HP FP Discharge Rate HP - Starter Signal Starter switch (STSW) signal - Closed Throttle Position SW Closed throttle position switch - A/C Signal A/C signal - Fuel Cut Condition Fuel cut condition - Battery Voltage Battery voltage - Atmosphere Pressure Atmospheric pressure - ACIS VSV VSV for Air Intake Control Induction System (AICS) - ACT VSV VSV for A/C cut - VVT Control Status (Bank 2) VVT control (bank 2 Intake side) status - EVAP Purge VSV EVAP purge VSV - Fuel Pump/Speed Status Fuel pump speed status VSV for EVAP controlled by ECM (ground side duty control) VVT Control Status (Bank 1) VVT control (bank 1 Intake side) status - Vacuum Pump Key-off EVAP system pump status - EVAP System Vent Valve Key-off EVAP system vent valve status - AICV VSV VSV for Air Intake Control System (AICS) - TC and TE1 TC and TE1 terminals of DLC3 - ACM ACM control status - VVTL Aim Angle (Bank 1) VVT aim angle - VVT Change Angle (Bank 1) VVT change angle - VVT OCV Duty (Bank 1) VVT OCV operation duty - VVTL Aim Angle (Bank 2) VVT aim angle (bank 2 Intake side) - VVT Change Angle (Bank 2) VVT change angle (bank 2 Intake side) - VVT OCV Duty (Bank 2) VVT OCV (bank 2 Intake side) operation duty - Ignition Ignition - Engine Speed of Cyl #1 Misfire Count Cylinder #1 misfire rate Displayed only during idling Engine Speed of Cyl #2 Misfire Count Cylinder #2 misfire rate Displayed only during idling Engine Speed of Cyl #3 Misfire Count Cylinder #3 misfire rate Displayed only during idling Engine Speed of Cyl #4 Misfire Count Cylinder #4 misfire rate Displayed only during idling Engine Speed of Cyl #5 Misfire Count Cylinder #5 misfire rate Displayed only during idling Engine Speed of Cyl #6 Misfire Count Cylinder #6 misfire rate Displayed only during idling All Cylinders Misfire Count All cylinder misfire rate Displayed only during idling Misfire RPM Misfire RPM - Misfire Load Misfire load - Misfire Margin Misfire monitoring - Engine Run Time Accumulated engine running time - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance after DTC cleared -