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. Techstream displays freeze frame data recorded at five different points: 1)3 times before the DTC is set, 2) once when the DTC is set, and 3) once after the DTC is set. The data can be used to simulate the vehicle's condition around the time of the malfunction. The data may be helpful in determining the cause of a malfunction. It may also be helpful in determining whether a DTC is being caused by a temporary malfunction. 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.
- LIST OF FREEZE FRAME DATA LIST OF FREEZE FRAME DATA
LABEL (Tester Display) Measurement Item/Range Diagnostic Note Trouble Code Freeze DTC - Injector (Port) Injection period of No. 1 cylinder - IGN Advance Ignition advance - Calculate Load Calculated 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 approximately 0.0 g/sec: - Mass air flow meter power source circuit open or shorted
- VG circuit open or shorted
If 160.0 g/sec. or more:- E2G circuit open
Engine Speed Engine speed - Vehicle Speed Vehicle speed Speed indicated on speedometer Coolant Temp Engine coolant temperature If -40°C (-40°F), sensor circuit open
If 140°C (284°F) or more, sensor circuit shortedIntake Air Intake air temperature If -40°C (-40°F), sensor circuit open
If 140°C (284°F) or more, sensor circuit shortedAir-Fuel Ratio Ratio compared to stoichiometric level - Purge Density Learn Value Learning value of purge density - Evap Purge Flow Ratio of evaporative purge flow to intake air volume - EVAP (Purge) VSV Purge VSV duty ratio - Knock Correct Learn Value Correction learning value of knocking - Knock Feedback Value Feedback value of knocking - Throttle Position Throttle position - Throttle Sensor Position Throttle sensor positioning - Throttle Sensor Position #2 Throttle sensor positioning #2 - Throttle Motor Throttle actuator - 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 sensors 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 output voltage of sensors Total FT #1 Total fuel trim - 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 long-term to compensate for a continual deviation of short-term fuel trim from central value 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 is used for fuel control, malfunctioning
AF FT B1 S1 Fuel trim at A/F 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 output voltage of sensors Catalyst Temp (B1 S1) Estimated catalyst temperature (sensor 1) - Catalyst Temp (B1 S2) Estimated catalyst temperature (sensor 2) - Sub O2S Impedance B1 S2 Sub O2S Impedance B1 S2: Min.: 0 n, Max.: 21247.68 Ω - Initial Engine Coolant Temp Engine coolant temperature at engine start - Initial Intake Air Temp Intake air temperature at engine start - Injection Volume (Cylinder 1) Injection volume - Closed Throttle Position SW Closed throttle position switch - Stop Light Switch Stop light switch - Engine Oil Pressure SW Engine oil pressure switch signal Always ON while engine is running Fuel Lid Fuel Lid - Fuel Lid Switch Fuel lid switch ON: Open Battery Voltage Battery voltage Auxiliary battery voltage Atmosphere Pressure Atmosphere Pressure - EVAP Purge VSV Purge VSV Auxiliary battery voltage Fuel Pump/Speed Status Fuel pump/speed status - VVT Control Status (Bank 1) VVT control status (bank 1) - Vacuum Pump Vacuum Pump ON: Operate EVAP System Vent Valve EVAP System Vent Valve ON: Close Electric Fan Motor Electric fan motor - TC and TE1 TC and TE1 terminals of DLC3 - Fuel Filler Opener - - Tank Close Valve - - VVT Aim Angle (Bank 1) VVT aim angle (bank 1) - VVT Change Angle (Bank 1) VVT change angle (bank 1) - VVT OCV Duty (Bank 1) VVT OCV operation duty (bank 1) - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 1500 rpm FCTAU Fuel cut with a very light load Fuel cut being performed with a very light load to prevent incomplete engine combustion Ignition Ignition counter - Cylinder #1 Misfire Count Cylinder #1 misfire Count Displayed only during idling Cylinder #2 Misfire Count Cylinder #2 misfire Count Displayed only during idling Cylinder #3 Misfire Count Cylinder #3 misfire Count Displayed only during idling Cylinder #4 Misfire Count Cylinder #4 misfire Count Displayed only during idling All Cylinders Misfire Count All cylinder misfire Count Displayed only during idling Misfire RPM Engine speed when misfire occurs - Misfire Load Engine load when misfire occurs - Misfire Margin Margin to detect engine misfire - 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 - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared - Requested Engine Torque Requested engine torque - HV Target Engine Speed HV target engine speed - Actual Engine Torque Actual engine torque - Estimated Engine Torque Estimated engine torque - Engine Run Time Engine run time - Requested Engine Run Time Requested engine run time - Judge Time Engine Ignition Judge time engine ignition - Judge Time Engine Output Judge time engine output - Fuel Level Fuel level - ISC Learning ISC learning - F/C for Engine Stop Req Fuel cut for engine stop request - Engine Independent Engine independent - Racing Operation Racing operation - Request Warm-up Request warm-up - Engine Independent Control Engine independent control - ISC Learning Value ISC learning control -