• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
MIL Voltage Supply | P0650 | P0650 | -- |
MIL Control | P0650* | P0650 | P0650 |
*The MIL remains ON |
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.
• | The ignition is ON. |
• | The ECM has commanded the MIL ON and OFF at least once during the ignition cycle. |
• | DTC P0650 runs continuously. |
The ECM detects that the commanded state of the malfunction indicator lamp (MIL) driver and the actual state of the MIL control circuit do not match for greater than 3 seconds.
DTC P0650 is a Type A DTC
DTC P0650 is a Type A DTC
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
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.
⇒ | If the IPC warning indicators are not illuminated, test the IPC 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 MIL is illuminated, test the MIL control circuit terminal X2-30 for a short to ground. If the circuit tests normal, replace the IPC. |
⇒ | If the MIL does not illuminate, test the MIL control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM and ICM replacement, setup, and programming. |