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 P0601: Control Module Read Only Memory (ROM)DTC P0602: Control Module Not Programed
DTC P0607: Control Module Internal Performance
Conditions for Running the DTC
P0601
| • | The ignition is ON, with the engine OFF. |
| • | The DTCs run once an ignition cycle. |
P0602
| • | The ignition is ON, with the engine OFF. |
| • | The DTC runs once an ignition cycle. |
P0607
| • | The ignition is ON, with the engine OFF. |
| • | The ignition voltage is greater than 11 volts. |
| • | The DTC runs continuously with the ignition ON or engine running. |
Conditions for Setting the DTC
P0601
The ECM detects that the checksum calculation does not match the expected checksum.
P0602
The ECM detects that programing is incomplete for more than 1 second.
P0607
The ECM detects an internal condition for more than 3 seconds.
Action Taken When the DTC Sets
| • | DTC P0601 is a Type A DTC. |
| • | DTC P0602 is a Type B DTC. |
| • | DTC P0607 is a Type C DTC. |
Conditions for Clearing the DTC
| • | DTC P0601 is a Type A DTC. |
| • | DTC P0606 is a Type B DTC. |
| • | DTC P2610 is a Type C DTC. |
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 DTC information with a scan tool.
| ⇒ | If DTCs P0601, P0602, or P0607 failed this ignition, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
