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 as 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 set 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 duplicate 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
Label
(Techstream Display)Measure Item 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 - MAF Mass air flow volume If value is approximately 0.0 gm/sec: - Mass air flow meter power source circuit open or short
- VG circuit open or short
If value is 160.0 gm/sec or more:- E2G circuit open
Atmosphere Pressure Atmospheric pressure - 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 shortedEngine 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 % Absolute Accelerator Pedal Position (APP) No. 1 - Accel Sens. No. 2 Volt % Absolute APP No. 2 - Throttle Sensor Volt % Throttle position - Throttle Sensor #2 Volt % Throttle sensor positioning #2 - Throttle Sensor Position Throttle sensor positioning - Throttle Motor DUTY Throttle actuator - Injector (Port) Injector - Injection Volume (Cylinder 1) Injection volume - Fuel Pump/Speed Status Fuel pump/speed status - Vacuum Pump Vacuum pump (leak detection pump) ON: Operate EVAP (Purge) VSV EVAP purge VSV duty ratio - Evap Purge Flow Purge flow - Purge Density Learn Value Learning value of purge density - EVAP System Vent Valve EVAP System Vent Valve ON: Close EVAP Purge VSV VSV for EVAP - Target Air-Fuel Ratio Air-fuel ratio - AF Lambda B1 S1 Fuel trim at A/F sensor - AF Lambda B2 S1 Fuel trim at A/F sensor - AFS Voltage 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 output voltage of sensor AFS Voltage 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 output voltage of sensor AFS Current B1 S1 A/F sensor output current - AFS Current B2 S1 A/F sensor output current - 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 output voltage 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 output voltage of sensor Sub O2S Impedance B1S2 Heated oxygen sensor impedance (sensor 2) - Sub O2S Impedance B2S2 Heated oxygen sensor impedance (sensor 2) - Short FT #1 Short-term fuel trim Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Total FT #1 Total fuel trim - 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 valve Short FT #2 Short-term fuel trim Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #2 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 valve Total FT #2 Total fuel trim - 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 A/F 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 A/F 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 A/F 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 A/F 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 - AICV VSV AICV VSV - VVT Control Status #1 VVT control status (bank 1) - VVT Control Status #2 VVT control status (bank 2) - 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 - Power Steering Signal Record Power steering signal - Starter Relay Starter relay - Power Steer. Sig. Record Power steering signal (history) Signal status usually ON until engine switch turned off ACC Relay ACC relay - Neutral Position SW Signal PNP switch signal - Stop Light Switch Stop light switch - A/C Signal A/C signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition - 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 - Cylinder #1 Misfire Count Cylinder #1 misfire Count Displayed only while idling Cylinder #2 Misfire Count Cylinder #2 misfire Count Displayed only while idling Cylinder #3 Misfire Count Cylinder #3 misfire Count Displayed only while idling Cylinder #4 Misfire Count Cylinder #4 misfire Count Displayed only while idling Cylinder #5 Misfire Count Cylinder #5 misfire Count Displayed only while idling Cylinder #6 Misfire Count Cylinder #6 misfire Count Displayed only while idling All Cylinders Misfire Count All cylinders misfire Count Displayed only while idling Misfire RPM Misfire RPM - Misfire Load Misfire load - Misfire Margin Misfire monitoring - Catalyst OT MF F/C Catalyst Over Tmp Misfire prevention F/C - Cat OT MF F/C History Catalyst Over Tmp Misfire prevention F/C History - Cat OT MF F/C Cylinder#1 Catalyst Over Tmp Misfire prevention F/C#1 - Cat OT MF F/C Cylinder#2 Catalyst Over Tmp Misfire prevention F/C#2 - Cat OT MF F/C Cylinder#3 Catalyst Over Tmp Misfire prevention F/C#3 - Cat OT MF F/C Cylinder#4 Catalyst Over Tmp Misfire prevention F/C#4 - Cat OT MF F/C Cylinder#5 Catalyst Over Tmp Misfire prevention F/C#5 - Cat OT MF F/C Cylinder#6 Catalyst Over Tmp Misfire prevention F/C#6 - ACM Inhibit ACM Inhibit - ACM Active control mount VSV duty ratio - Electric Fan Motor Electric fan motor ON: Operating Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 2500 rpm FC TAU FC TAU Fuel cut being performed with a very light load to prevent incomplete engine combustion Received MIL from ECT MIL status - Shift Position Sig from ECT PNP switch status - A/T Oil Temp from ECT A/T Oil temperature - SPD (NO) SPD (NO) - ECT Look Up ECT look up - Shift SW Status (P Range) Shift switch status (P range) - Shift SW Status (R Range) Shift switch status (R range) - A/T Oil Temperature 1 A/T Oil temperature - Shift SW Status (N Range) Shift switch status (N range) - Sports Shift Up SW Sports shift up switch - Sports Shift Down SW Sports shift down switch - Sports Mode Selection SW Sports mode selection switch - Shift SW Status (D Range) Shift switch status (D range) -