• | 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. |
Circuit | Short to Ground | Open | 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 system voltage is 9-18 volts. |
• | The ECM has commanded the MIL ON and OFF at least once during the ignition cycle. |
• | DTC P0650 runs continuously when the ignition is ON. |
The ECM detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for greater than 5 seconds.
DTC P0650 is a Type B DTC.
DTC P0650 is a Type B DTC.
If the condition is intermittent, move the related harnesses and connectors with the engine operating. Monitor the scan tool Circuit Test Status parameters for the component. The Circuit Test Status parameter will change from OK or Not Run to Fault if there is a condition with the circuit or a connection.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | MIL Ckt. Short Gnd Test Status |
• | MIL Ckt. Open Test Status |
• | MIL Ckt. Short Volts Test Status |
Each parameter should change between OK to Not run or from Not Run to OK. |
⇒ | If the IPC warning indicators are not functioning properly, 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 X1-12 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 or IPC replacement, setup, and programming |