Freeze Frame Data

The PCM records the diagnostic trouble code and also the engine operating conditions at the time the malfunction was detected. These data are called "freeze frame" data.

This data indicates the engine operating condition from when nothing at all is detected to the initial detection of the malfunction. However, misfiring or fuel trim malfunction data are always replaced with the latest data.

This data can be read by using the scan tool, and can then be used in simulation tests for troubleshooting.

Data items are:
- Engine coolant temperature °C or °F
- Engine speed r/min or RPM
- Vehicle speed -- km/h or mph
- Right bank long-term fuel compensation (Long-term fuel trim) %
- Right bank short-term fuel compensation (Short-term fuel trim) %
- Left bank long-term fuel compensation (Long-term fuel trim) %
- Left bank short-term fuel compensation (Short-term fuel trim) %
- Fuel Control Condition:
- Open loop
- Closed loop
- Open loop - Drive condition
- Open loop - DTC set
- Malfunction of closed loop-O2 (rear)
- Calculated load value %
- MAP vacuum in.Hg (vacuum)
- Diagnostic trouble code during data recording