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 provide an overview of each diagnostic category. |
DTC Descriptor
DTC P0650: Malfunction Indicator Lamp (MIL) Control CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
MIL Voltage Supply | P0650 | P0650 | -- |
MIL Control | P0650 | 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 engine control module (ECM) performs a self test for the MIL lamp and its circuitry by commanding the MIL ON and OFF every time the engine is started. The ECM 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. |
| • | Battery voltage is between 10-16 V. |
Conditions for Setting the DTC
| • | MIL control command is ON. |
| • | Low voltage condition on the MIL control circuit when the indicator is commanded OFF for longer than 1 second. |
| OR |
| • | MIL control command is OFF. |
| • | High voltage condition on the MIL control circuit when the indicator is commanded ON for longer 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
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
Ignition ON, the MIL should turn ON and OFF when commanded with a scan tool.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the IPC.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit and ground.
- Connect a test lamp between the control circuit and the ignition circuit.
- Command the MIL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, replace the IPC.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the IPC. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM and IPC replacement, setup, and programming
