Checking Idle Air Control Motor

Tests 615 - 619:

Tests 620 - 624:

Tests 625 - 628:

Tests 629 - 630:

SYMPTOM
* CHECKING THE IDLE AIR CONTROL MOTOR

POSSIBLE CAUSES
- DRB unable to set engine speed
- IAC driver # 1 shorted to ground
- IAC driver # 2 shorted to ground
- IAC driver # 3 shorted to ground
- IAC driver # 4 shorted to ground
- IAC motor connector terminals observable defect
- PCM connector terminals observable defect
- Engine vacuum leaks
- Idle air control motor defective
- IAC driver circuits 2, 3, 4 shorted together
- IAC driver circuits 1, 2, 3, 4 shorted together
- IAC driver circuits 3 and 4 shorted together