Colt, Mirage, Summit
- 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. See ENGINE CONTROL MODULE (ECM) LOCATION
table under COMPUTERIZED ENGINE CONTROLS. 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.
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.