P0604

Diagram Chart:

CIRCUIT DESCRIPTION

The ECM contains data which is essential to running the engine. The ECM continuously checks the integrity of this data.

CONDITIONS FOR RUNNING THE DTC

Engine cranking.

CONDITIONS FOR SETTING THE DTC

The ECM determines that an internal data test did not pass.

ACTION TAKEN WHEN THE DTC SETS

The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The ECM turns off the MIL after three consecutive drive trips that the diagnostic runs and does not fail.

^ A History DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other emission related diagnostic.

^ The ECM battery voltage is interrupted.

^ The scan tool clears the MIL/DTC.


DIAGNOSTIC AIDS

Replace the ECM even if this DTC exists only in history.


TEST DESCRIPTION

The number(s) below refer to the Step numbers on the diagnostic table.

2. Replace the ECM even if this DTC exists only in history.