Idle Air Control (IAC) Motor
CAUTION:
DO NOT
apply more than 6 volts to IAC motor.
NOTE:
For diagnosis and testing information concerning IAC motor position sensor, see TESTS W/CODES
article in this section.
- Using a stethoscope, listen for operating sound of IAC motor when ignition switch is placed in ON position. If no operating sound can be heard, proceed with following tests.
- This step checks for continuity between IAC motor and ECM. Disconnect IAC motor harness connector and ECM harness connector. Connect a jumper wire between ECM harness connector terminal No. 4 and vehicle ground. See Figure . Using DVOM, check continuity between IAC harness connector No. 5 and vehicle ground. See Fig 1 .
- Move jumper wire to ECM harness connector terminal No. 17 and vehicle ground. Using DVOM, check continuity between IAC harness connector No. 6 and vehicle ground. If continuity does not exist, check and repair appropriate circuit. If continuity exists, go to step 4.
- If preceding tests do not show any system or component malfunction and ECM is suspected, replace ECM and retest system.