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 engine control module (ECM) monitors the MIL control circuit for conditions that are incorrect for the commanded state of the MIL. For example, a failure condition exists if the ECM detects low voltage when the MIL is commanded OFF, or high voltage when the MIL is commanded ON.
Conditions for Running the DTC
* The engine speed is greater than 80 RPM.
* The ignition voltage is between 10-18 volts.
* The ECM has commanded the MIL ON and OFF at least once during the ignition cycle.
* DTC P0650 runs continuously once the above conditions are met .
Conditions for Setting the DTC
* The ECM detects an open, a short to ground, or a short to voltage on the circuit that controls the MIL.
* The condition exists for at least 4 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.
Diagnostic Aids
If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the circuit status for the component with a scan tool. The circuit status parameter changes from OK or Indeterminate to Fault if there is a condition with the circuit or a connection.
Reference Information
Schematic Reference
Engine Controls Schematics (Electrical 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. Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF as commanded.
2. 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 IPC indicators or gages are inoperative, refer to Instrument Cluster Gages Inoperative (Instrument Cluster Gages Inoperative) .
2. Ignition OFF, disconnect the ECM harness connectors. Ignition ON, the MIL should not illuminate.
• If the MIL is illuminated, test the MIL control circuit for a short to ground. If the circuit tests normal, replace the IPC.
3. Ignition ON, connect a 3A fused jumper wire between the MIL control circuit 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 IPC/bulb.
4. If all circuits/connections test normal, replace the ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Instrument Cluster Replacement (Right Hand Drive) (Instrument Cluster Replacement (Right Hand Drive))Instrument Cluster Replacement (Left Hand Drive) (Instrument Cluster Replacement (Left Hand Drive))
* Control Module References (Programming and Relearning) for engine control module replacement, setup, and programming