Freeze Frame Data

CAUTION:
1. If battery voltage is low, diagnostic trouble codes may not be output. Be sure to check the battery and charging system before continuing.
2. If the battery us disconnected or if the PCM connector is disconnected, the diagnostic trouble code memory will be erased. Do not disconnect the battery or PCM until after the diagnostic trouble codes are recorded.
3. Turn the ignition switch off before connecting or disconnecting the scan tool.




FREEZE FRAME DATA
The PCM records the diagnostic trouble code and also the engine operating conditions at the time the malfunction was detected. This data is 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.