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Test Procedure

  1. Turn ignition off. Disconnect IAC valve 3-pin harness connector. See Figure . Turn ignition on. Measure voltage between ground and IAC valve harness connector terminal No. 2 (Red/Green wire). Voltage should be battery voltage. If voltage is as specified, go to step  6 . If voltage is not as specified, go to next step.
  2. Turn ignition off. Locate fuses and Main relay in engine compartment fuse/relay box. See Figure . Check Main relay operation and fuses condition. For Main relay operation test. See FUEL PUMP & MAIN RELAYS (RIO) under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. If necessary, also check Main relay circuits. See RIO under ENGINE PERFORMANCE 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. Go to step  6 .
  3. Turn ignition off. Measure resistance at IAC valve opening and closing coils (component side). See IDLE AIR CONTROL VALVE COIL RESISTANCE TEST  table. If resistance is as specified, go to next step. If resistance is not as specified, temporarily install a known good IAC valve and check for proper operation. If problem is corrected, replace valve. 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 1 & 2 16.5-18.5 Ohms At 68°F (20°C)
    Closing Coil 2 & 3 14.5-16.5 Ohms At 68°F (20°C)
  4. Disconnect ECM harness connector "B03". See Figure . Measure resistance between IAC valve connector terminal No. 1 (White wire) and ECM connector terminal B03-43. Also measure resistance between IAC valve connector terminal No. 3 (Green wire) and ECM connector terminal B03-44. Both resistances should be below one ohm. If resistances are as specified, go to next step. If any resistance is not as specified, repair open or short circuit as necessary. Go to step  6 .
  5. With IAC valve and ECM harness connectors disconnected, measure resistance between ground and IAC valve connector terminals No. 1 (White wire) and No. 3 (Green wire). Both resistances should be infinite. If resistances are as specified go to next step. If any resistance is not as specified, repair short circuit as necessary. Go to next step.
  6. 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.
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