P0604

Circuit Description

The PCM performs an internal self-test on it's Random Access Memory (RAM) or read/write memory. If this self-test fails, this DTC sets.

Conditions for Running the DTC

^ The ignition voltage is greater than 10 volts.
^ The ignition is ON for 5 seconds.

Conditions for Setting the DTC

The internal RAM test fails.

Action Taken When the DTC Sets

^ The PCM will illuminate the MIL during the first trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. This DTC indicates an internal PCM problem.