Chime Inoperative With Only One Warning Lamp

SYMPTOM
* CHIME INOPERATIVE WITH ONLY ONE WARNING LAMP

POSSIBLE CAUSES
- Oil pressure sensor defective
- Oil pressure sense circuit open
- Powertrain Control Module defective
- Cooling system operation faulty
- DRB not showing PCM active on Bus
- DRB shows ECT sensor voltage too high
- DRB shows ECT sensor voltage too low