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 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 MIL lamp must be commanded ON. |
| • | DTC P0650 runs continuously when the ignition is ON. |
Conditions for Setting the DTC
The control module detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than 3 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.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Scan Tool Reference
Diagnostic Aids
An intermittent or poor connection at the MIL control circuit in the inline harness connector may cause this DTC to set. Inspect the connector terminals for any condition that may result in excessive resistance. Refer to Testing for Intermittent Conditions and Poor Connections .
Circuit/System Verification
- Ignition ON, the MIL should turn ON and OFF when commanded with a scan tool.
- Engine running, observe the DTC information with a scan tool. DTC P0650 should not set.
- 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
- 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
