Test B: Unusual Starter Noise

PINPOINT TEST B: UNUSUAL STARTER NOISE

B1-B2:

B3:

Normal Operation
Under normal operation, constant power is supplied to the starter relay on circuit 1050 (LG/VT). When the key is placed in the START position, with the vehicle in PARK or NEUTRAL, the TR sensor provides power to the starter relay coil on circuit 33 (WH/PK) and the PCM provides ground to the starter relay coil on circuit 1419 (LG/YE). When the coil of the relay is energized, it sends power to the starter motor on circuit 113 (YE/LB).

Possible Causes
Unusual starter noise can be caused by the following:
- Loose starter motor mounting bolts or brackets
- Worn or damaged flywheel ring gear
- Worn or damaged starter motor drive gear