DTC Descriptor
DTC P0650: Malfunction Indicator Lamp (MIL) Control CircuitDiagnostic Fault Information
Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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 control module monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL.
Conditions for Running the DTC
DTC P0650 runs continuously when the ignition is ON and the ignition voltage is between 9-18 volts.
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 one second.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
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 instrument panel cluster (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 the 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.
