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 provides an overview of each diagnostic category. |
DTC Descriptor
DTC P1640 00: Control Module Power Circuit MalfunctionCircuit/System Description
These DTC apply to internal microprocessor integrity conditions within the engine control module (ECM).
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The DTCs run continuously once the above condition is met. |
Conditions for Setting the DTC
The ECM detects an internal EEPROM failure.
Action Taken When the DTC Sets
DTC P1640 is a Type A DTCs.
Conditions for Clearing the DTC
DTC P1640 is a Type A DTCs.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Testing
- Observe the Freeze Frame/Failure Records with a scan tool.
- Clear the DTCs with a scan tool.
- Ignition OFF for 30 s.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
| ⇒ | If DTC P1640 failed this ignition, replace the K20 Engine Control Module (ECM). |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
