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 (MI) Circuit MalfunctionDiagnostic Fault Information
Circuit | Short to Ground | Open | 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 engine control module (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 in the Run or Crank position. |
| • | The ignition voltage is between 9-18 volts. |
| • | 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 A DTC.
Conditions for Clearing the MIL/DTC
DTC P0650 is a type A DTC.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Using a scan tool, command the MIL light On and OFF.
Circuit/System Testing
- Ignition OFF.
- Disconnect the MIL light harness connector at the ECM.
- Ignition ON, engine OFF. Connect a 3-A fusible link wire between the MIL light control circuit on the wiring harness connector at the ECM and a known ground.
- If all circuits test normal replace the IPC.
| ⇒ | If MIL light illuminates replace the ECM. |
| ⇒ | If MIL does not illuminate, check the MIL light control circuit for an open/high resistance or a short to ground. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup and programming |
