P0650

Circuit Description
There should always be a steady Malfunction Indicator Lamp (MIL) when the ignition switch is on and the engine is not running. The ignition voltage is supplied within the instrument cluster to the indicator bulb. The Engine Control Module (ECM) controls the lamp by grounding the control circuit via an internal solid state device called a driver.

Conditions for Running the DTC
^ The engine speed must exceed 40 RPM.
^ The battery voltage must be between 7.5 and 14 volts.

Conditions for Setting the DTC
The ECM determines there is an open, a short to ground or a short to voltage in the MIL control circuit.

Action Taken When the DTC Sets
The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC
^ The ECM turns off the MIL after three consecutive drive trips that the diagnostic runs and passes.
^ A History DTC clears after forty consecutive warm-up cycles in which no failures are reported by this diagnostic or any other emission related diagnostic.
^ The ECM battery voltage is interrupted.
^ The scan tool clears the MIL/DTC.

Diagnostic Aids

Notice: Refer to J 35616-A Connector Test Adapter Kit Notice in Service Precautions.

^ Use the J 35616-A Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
^ If the ignition feed circuit is suspected of being open, check if the other bulbs on that circuit illuminate.
^ Check to see if instrument panel fuse 15 is open.
^ An intermittent may be caused by the following:
- Corrosion
- A mis-routed harness
- A rubbed through wire insulation
- A broken wire inside the insulation

Refer to Symptoms for the Intermittents. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. The MIL should remain ON when the ignition is turned ON and the engine is OFF.
3. If the other indicator lamps in the instrument cluster are functioning, the feed circuit is OK.
12. After the engine starts, the MIL should illuminate briefly and turn OFF.