Low Engine Oil Level Indicator Diagnosis

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The oil level switch is a normally open switch. When the oil level is within an acceptable range the oil level switch closes. The switch opens when the engine oil level drops below a predetermined amount. The Vehicle Control Module (VCM) turns ON the oil level indicator when the engine oil level drops below a predetermined value.

DIAGNOSTIC AIDS
The LOW OIL LEVEL message will only appear in the message center within a few seconds after the vehicle has been started. The ignition key must be removed from the ignition for 10 seconds, and then start the vehicle to check if the message has been cleared.

An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This steps checks the oil level sensor signal circuit between the VCM and the sensor.
3. This steps checks the oil level sensor ground circuit between the VCM and the sensor.
4. This steps checks for an open in the oil level sensor signal circuit between the VCM and the oil level sensor.
5. This steps checks the oil level signal circuit for a short to ground.