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 the malfunction. The data may assist in identifying the cause of the malfunction, and 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 by ECM - Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount MAF Air flow rate from mass air flow meter If value approximately 0.0 gm/sec: - Mass air flow meter power source circuit open
- VG circuit open or short
If value 271.0 gm/sec or more:- E2G circuit open
Atmosphere Pressure Atmosphere pressure - Coolant Temp Engine coolant temperature - If value -40°C (-40°F): sensor circuit open
- If value 140°C (284°F): sensor circuit shorted
Intake Air Intake air temperature - If value -40°C (-40°F): sensor circuit open
- If value 140°C (284°F): sensor circuit shorted
Engine Run Time Engine run time - Initial Engine Coolant Temp Initial engine coolant temperature Service data Initial Intake Air Temp Initial intake air temperature Service data 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 positioning Recognition value for throttle opening angle on ECM
Read value with ignition switch ONThrottl Sensor #2 Volt % Absolute throttle sensor positioning #2 Recognition value for throttle opening angle on ECM
Read value with ignition switch ONThrottle Sensor Position Throttle sensor positioning Recognition value for throttle opening angle on ECM
Read value with ignition switch ONThrottle Motor DUTY Throttle actuator - Injector (Port) Injection direction for cylinder 1 - Injection Volum (Cylinder1) Injection volume (Cylinder 1) Quantity of fuel injection volume for 10 times Fuel Pump/Speed Status Fuel pump/status Active Test support data Vacuum Pump Key-off EVAP system leak detection pump status Active Test support data EVAP (Purge) VSV EVAP (Purge) VSV control duty Order signal from ECM Evap Purge Flow Ratio of evaporative purge flow to intake air volume Service data Purge Density Learn Value Learning value of purge density Service data EVAP System Vent Valve key-off EVAP system vent valve status Active Test support data EVAP Purge VSV VSV status for EVAP control Active Test support data Target Air-Fuel Ratio Ratio compared to stoichiometric level - AF Lambda B1 S1 Short-term fuel trim associated with bank 1 sensor 1 - AFS Voltage B1 S1 Air fuel ratio 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 sensors AFS Current B1 S1 Air fuel ratio sensor output current for bank 1 sensor 1 Value becomes higher when fuel-cut executed under high engine speed O2S B1 S2 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 sensors O2S Impedance B1S2 Sub heated oxygen sensor impedance (bank 1 sensor 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 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 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 is 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 air fuel ratio 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 air fuel ratio sensor, witch is used for fuel control, malfunctioning
IGN Advance Ignition timing advance for cylinder 1 - Knock Feedback Value Feedback value of knocking Service data Knock Correct Learn Value Correction learning value of knocking Service data VVT Control Status #1 VVT control (bank 1) status Active Test support data Catalyst Temp B1 S1 Catalyst temperature (associated sensor 1) - Catalyst Temp B1 S2 Catalyst temperature (associated sensor 2) - Starter Signal Starter signal - Starter Control Starter control - Starter Relay Starter relay - ACC Relay ACC relay - Neutral Position SW Signal* Neutral position switch signal - Stop Light Switch Stop light switch status - A/C Signal A/C signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition ON or OFF - Electrical Load Signal Electrical load signal - Time after DTC Cleared Time since DTCs cleared - Distance from DTC Cleared Distance traveled since DTCs cleared - Warmup Cycle Cleard DTC Warm-up cycles since DTCs cleared Number of warm-up cycles since DTCs cleared TC and TE1 TC and CG (TE1) terminals of DLC3 Active Test support data Ignition Trig. Count Ignition counter to calculated misfire count - Cylinder #1 Misfire Count Misfire count for cylinder 1 - Cylinder #2 Misfire Count Misfire count for cylinder 2 - Cylinder #3 Misfire Count Misfire count for cylinder 3 - Cylinder #4 Misfire Count Misfire count for cylinder 4 - All Cylinders Misfire Count All cylinders misfire count - Misfire RPM Average engine speed when misfire occurs - Misfire Load Average engine load when misfire occurred - Misfire Margin Margin to detect engine misfire Misfire detection margin Catalyst OT MF F/C Catalyst over temperature misfire prevention F/C not available - Cat OT MF F/C History Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#1 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#2 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#3 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#4 Catalyst over temperature misfire prevention F/C history OFF - Electric Fan Motor Electric cooling fan motor Active Test support data Idle Fuel Cut Fuel cut idle Idle Fuel Cut = "ON" when throttle valve fully closed and engine speed over 2800 RPM FC TAU FC TAU Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete *: Automatic transaxle models only