P0650

DTC P0650 Malfunction Indicator Lamp (MIL) Control Circuit

Circuit Description

The malfunction indicator lamp (MIL) is located on the instrument panel (IP) cluster. The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service.

The 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. If the ECM detects an improper voltage level on the control circuit this DTC will set.

Condition for Running the DTC

^ The ignition voltage is between 10 to 16 volts.
^ The ignition switch is ON.

Condition for Setting the DTC

Either of the following condition is met:
^ The ECM detects a low voltage condition on the MIL control circuit when the lamp is commanded OFF.
^ The ECM detects a high voltage condition on the MIL control circuit when the lamp is commanded ON.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type B.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type B.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.

Circuit/System Testing DTC P0650