P0650

DTC P0650

Diagnostic Instructions

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

DTC Descriptor
DTC P0650
- Malfunction Indicator Lamp (MIL) Control Circuit

Diagnostic Fault Information





Circuit/System Description

Ignition voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. There should be a steady MIL with the ignition ON and the engine OFF.

Conditions for Running the DTC

* The engine is operating.
* Remote vehicle start, if equipped, is not active.
* The ignition voltage is between 11-18 volts.
* The DTCs runs continuously once the above conditions are met.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTC P0650 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0650 is a Type B DTC.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

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

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

Circuit/System Verification

1. Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF.
2. Engine idling, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:

* MIL Ckt Short Gnd Test Status
* MIL Ckt Open Test Status
* MIL Ckt Short Volts Test Status
Each parameter should display OK or Not Run.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. If any other indicators are inoperative on the IPC, refer to Symptoms - Displays and Gauges (Symptoms - Displays and Gauges) for further diagnosis.
2. Ignition OFF, disconnect the ECM harness connector X1.
3. Ignition ON, the MIL should not illuminate.

• If the MIL illuminates, test the MIL control circuit terminal 1-X1 for a short to ground. If the circuit test normal, replace the bulb/IPC.

4. Ignition ON, connect a 3 A fused jumper wire between the MIL control circuit terminal 1-X1 and ground. The MIL should illuminate.

• If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the bulb/IPC.

5. If all circuits test normal, replace the ECM.

Repair Instructions

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

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