P0650

DTC P0650

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category



DTC Descriptor
DTC P0650
- Malfunction Indicator (MI) Circuit Malfunction




Diagnostic Fault Information






Circuit/System Description

The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC).


The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The engine control module (ECM) monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL.


Conditions for Running the DTC

* The ignition is in the Run or Crank position.
* The ignition voltage is between 9-18 volts.
* DTC P0650 runs continuously when the ignition is ON.



Conditions for Setting the DTC

The ECM detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than 5 seconds.


Action Taken when the DTC Sets

DTC P0650 is a Type B DTC.


Conditions for Clearing the MIL/DTC

DTC P0650 is a Type B DTC.


Reference Information
Schematic Reference

* Instrument Cluster Schematics (Instrument Cluster Schematics).
* Engine Controls Schematics (Electrical Diagrams).

Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Connector Repairs (Component Tests and General Diagnostics)
* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Verification

Using a scan tool, command the MIL light On and OFF.


Circuit/System Testing

1. Ignition OFF.
2. Disconnect the MIL light harness connector at the ECM.
3. Ignition ON, engine OFF. Connect a 3A fusible link wire between the MIL light control circuit on the wiring harness connector at the ECM and a known ground.

• If MIL light illuminates, replace the ECM.
• If MIL does not illuminate, inspect the MIL light control circuit for an open/high resistance or a short to ground.

4. If all circuits test normal, replace the IPC.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Instrument Cluster Replacement (Service and Repair).
* Control Module References (Programming and Relearning)for ECM replacement, setup and programming