For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
DTC Descriptors
DTC P0604: Control Module Random Access Memory (RAM)DTC P0605: Control Module Programming Read Only Memory (ROM)
Circuit/System Description
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM).
Conditions for Running the DTC
| • | The ignition is ON or the engine is operating. |
| • | The DTCs run once an ignition cycle. |
Conditions for Setting the DTC
The ECM detects an internal condition for more than 3 seconds.
Action Taken When the DTC Sets
DTCs P0604 and P0605 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0604 and P0605 are Type A DTCs.
Reference Information
Description and Operation
Engine Control Module Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Testing
Ignition ON, observe the scan tool DTC information parameter.
| ⇒ | If DTCs P0604 or P0605 failed this ignition, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming
