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 Lamp (MIL) Control Circuit




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 powertrain control module (PCM) monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL.


Conditions for Running the DTC

DTC P0650 runs continuously when the ignition is ON.


Conditions for Setting the DTC

The PCM detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than 1 second.


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

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

Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

1. Turn ON the ignition, then command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF when commanded.
2. 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 data.



Circuit/System Testing

1. Turn OFF the ignition.
2. Disconnect the PCM.
3. Turn ON the ignition with the engine OFF.

• If the MIL is still ON, test the MIL control circuit for a short to ground.
• If the MIL control circuit tested OK and the MIL stayed ON, replace the instrument cluster. Refer to Instrument Cluster Replacement (Instrument Cluster Replacement) .
• If the MIL control circuit tested OK and the MIL went out when the PCM was disconnected, replace the PCM. Refer to Control Module References (Programming and Relearning) for PCM replacement, setup, and programming.

4. Measure for 12 volts from the MIL ignition voltage circuit in the instrument cluster harness connector to a ground.

• If there is less than 12 volts, test the MIL ignition voltage circuit for an open, or a short to ground, and an open fuse.

5. Remove the fuse that supplies voltage to the MIL.
6. Measure for less than 1 volt from the MIL control circuit in the PCM harness connector to a good ground.

• If there is more than 1 volt, test the MIL control circuit for a short to voltage.

7. Install the fuse that supplies voltage to the MIL.
8. The MIL should illuminate with a 3-amp fused jumper wire connected between the MIL control circuit in the PCM harness connector and a good ground.

• If the MIL does not illuminate, test the MIL control circuit for an open or high resistance.
• If the MIL control circuit tests OK, replace the instrument cluster. Refer to Instrument Cluster Replacement (Instrument Cluster Replacement) .
• If the MIL does illuminate, but does not when commanded ON with a scan tool, replace the PCM. Refer to Control Module References (Programming and Relearning) for PCM replacement, setup, and programming.




Repair Instructions

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

* Instrument Cluster Replacement (Instrument Cluster Replacement)
* Control Module References (Programming and Relearning) for PCM replacement, setup, and programming