Idle Air Control (IAC) Motor
WARNING: This page is about a different car, the 1994 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect harness connector to motor. Check resistance across IAC coil terminals "A" and "B" (coil "B") and "C" and "D" (coil "A"). See Fig 1 . Resistance should be 40-80 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace IAC motor.
- Check resistance between IAC terminals "B" to "C" and "A" to "D". Resistance should be infinite. If resistance is not as specified, replace IAC motor.
NOTE:
Additional testing of Idle Air Control (IAC) motor requires an IAC motor actuator and node light, or a scan tester capable of cycling ECM output devices (General Motors Tech 1).