Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0650: Malfunction Indicator Lamp (MIL) Control CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
MIL Voltage Supply | P0650 | P0650 | -- | -- |
MIL Control | P0650, MIL ON | P0650 | P0650 | -- |
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 control module 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 ON or the engine is running. |
| • | The ignition 1 voltage is greater than 10 volts. |
| • | The DTC runs continuously once the above conditions are met. |
Conditions for Setting the DTC
P0650
The engine control module (ECM) detects the MIL control circuit is open, shorted to ground, or shorted to a voltage for greater than 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
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF when commanded.
- 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
- If any other IPC indicators or gages are inoperative, refer to Symptoms - Displays and Gages.
- Ignition OFF, disconnect the harness connector at the ECM.
- Ignition ON, observe the MIL. The MIL should not illuminate.
- Install a 3A fused jumper wire between the MIL control circuit terminal K92 and ground. The MIL should illuminate.
- If the MIL illuminates and all the circuits test normal, test for a poor connection at the ECM.
| ⇒ | If the MIL illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the IPC. |
| ⇒ | If the MIL does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the bulb or the IPC. |
| ⇒ | If the fuse opens, test the control circuit for a short to voltage. |
| ⇒ | If the connection tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
