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.
NOTE: Procedures are provided by manufacturer for component testing using an engine analyzer with oscilloscope capability. Refer to manufacturer's operation manual for instructions in use of oscilloscope. Go to step 10 for test procedures using oscilloscope.