Checking IAC Motor

Tests 1 - 3:

Tests 4 - 7:

Tests 8 - 11:

Tests 12 - 15:

Test 16:

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
- PCM connector terminals
- Engine vacuum leaks
- Idle air control motor
- 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