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) provide 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 states 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 ignition is in the Run or Crank position.
* The ignition voltage is between 9-18 volts.
* The ECM has commanded the MIL ON and OFF at least once during the ignition cycle.
* 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.
Diagnostic Aids
If the condition is intermittent, move the related harnesses and connectors with the engine operating. Monitor the scan tool Circuit Test Status parameters for the component. The Circuit Test Status parameter will change from OK or Not Run to Fault if there is a condition with the circuit or a connection.
Reference Information
Schematic Reference
* Instrument Cluster Schematics (Instrument Cluster Schematics)
* Engine Controls Schematics (except L96) ([1][2]Electrical Diagrams)Engine Controls Schematics (L96) ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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 (Control Module References) 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. Ignition ON, observe each of the MIL control circuit Test Status parameters listed below with a scan tool:
* 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. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 harness connector at the K20 ECM.
2. Ignition On, the MIL should not illuminate.
• If the MIL is illuminated, test the MIL control circuit terminal listed below for a short to ground. If the circuit tests normal, replace the instrument panel cluster.
* ECM terminal X1-52 for RPO L96
* ECM terminal X1-68 for all other RPOs
3. Connect a 3 A fused jumper wire between the MIL control circuit terminal listed below and ground. The MIL should illuminate.
* ECM terminal X1-52 for RPO L96
* ECM terminal X1-68 for all other RPOs
• If the MIL illuminates, replace the ECM.
• If the MIL does not illuminate, test the appropriate MIL control circuit for a short to voltage, or an open/high resistance. If the MIL control circuit tests OK, test the instrument panel cluster ignition circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the instrument panel cluster/bulb.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Instrument Cluster Replacement (Without RPO SLT) (Instrument Cluster Replacement (Without RPO SLT))Instrument Cluster Replacement (With RPO SLT) (Instrument Cluster Replacement (With RPO SLT))
* Control Module References (Control Module References) for ECM replacement, setup, and programming