Test C: Unusual Starter Noise

PINPOINT TEST C: UNUSUAL STARTER NOISE

C1-C2:

C2-C3:

Normal Operations
Under normal operation, when the ignition switch is turned to the START position and held, power is supplied through circuit CDC35 (BU/WH) to the starter relay coil. If equipped with an automatic transmission, the PCM will receive a signal from the transmission control module (TCM) that the transmission is in PARK or NEUTRAL through circuit CET22A (GY/BN). If equipped with a manual transmission, the PCM will receive a signal from the clutch pedal position (CPP) switch through circuit CET21 (GN/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts to close. This allows power to be supplied from battery junction box (BJB) fuse 40 (30A) to the relay contacts, which then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and close the solenoid contacts, allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine. The PCM will disengage the starter motor when the ignition switch has been turned to the RUN position.

This pinpoint test is intended to diagnose the following:
- Starter motor mounting
- Starter motor mounting bolts
- Starter motor drive
- Flywheel or flexplate ring gear
- Starter motor