Test Procedure
- Turn ignition off. Disconnect IAC valve 3-pin harness connector. See Fig 1 . Turn ignition on. Measure voltage between ground and IAC valve harness connector terminal No. 2 (Red/Yellow wire). Voltage should be battery voltage. If voltage is not as specified, go to next step. If voltage is as specified, go to step 3 .
- Turn ignition off. Locate fuses and Main relay in engine compartment fuse/relay box. Check Main relay operation and fuses condition. For Main relay operation test. See FUEL PUMP & MAIN RELAYS (SPECTRA) under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. Also if necessary check Main relay circuits. See ENGINE PERFORMANCE under SPECTRA in WIRING DIAGRAMS article. If fuses, relay and circuits are okay, go to next step. If fuses, relay or circuits are faulty, repair or replace as necessary, and go to step 6 .
- Turn ignition off. Measure resistance at IAC valve opening and closing coils (component side). See IDLE AIR CONTROL VALVE COIL RESISTANCE TEST
table. If resistances are as specified, go to next step. If any resistance is not as specified, temporarily install a known good IAC valve and check for proper operation. If problem is corrected, replace valve and go to step 6
.IDLE AIR CONTROL VALVE COIL RESISTANCE TEST
IAC Valve Coils Measure Resistance Between IAC Valve Terminal No. Resistance Specifications Opening Coil 2 & 3 16.5-18.5 Ohms At 68°F (20°C) Closing Coil 1 & 2 14.5-16.5 Ohms At 68°F (20°C) - Disconnect ECM 81-pin harness connector. See Figure . Measure resistance between IAC valve connector terminal No. 3 (White/Green wire) and ECM connector terminal No. 29. Also, measure the resistance between IAC connector terminal No. 1 (White/Yellow wire) and ECM connector terminal No. 29. Resistances should be below one ohm. If resistance is as specified, go to next step. If resistance is not as specified, repair open or short circuit as necessary and go to step 6 .
- With IAC valve and ECM harness connectors disconnected, measure resistance between ground and IAC valve connector terminals No. 3 (White/Green wire). Also, measure the resistance between IAC connector terminal No. 1 (White/Yellow wire) and ECM connector terminal No. 29. Resistances should be infinite. If resistance is as specified go to next step. If resistance is not as specified, repair short circuit as necessary and go to next step.
- After repair, return vehicle to original condition. Clear codes using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.