• | 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/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
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 state 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 engine speed is greater than 80 RPM. |
• | The ignition voltage is between 10-18 volts. |
• | The ECM has commanded the MIL ON and OFF at least once during the ignition cycle. |
• | DTC P0650 runs continuously once the above conditions are met. |
• | The ECM detects an open, a short to ground, or a short to voltage on the circuit that controls the MIL. |
• | The condition exists for at least 4 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. Observe 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
⇒ | If the MIL is illuminated, test the MIL control circuit terminal 54-X1 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |