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Home >> Acura >> 1996 >> Integra GS-R, 4D Sedan >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P1508 - Idle Air Control Valve
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DTC P1508 - Idle Air Control Valve

  1. Connect and operate scan tester, following manufacturer's instructions. Clear codes. Start engine. Retrieve codes. If DTC P1508 appears, go to next step. If DTC P1508 does not appear, problem is intermittent. Inspect for poor connections or loose wires associated with IAC and PCM, then repair as necessary.
  2. Turn ignition off. Unplug IAC valve connector. Turn ignition on. Measure voltage between ground and IACV 2P connector terminal two Yellow/Black wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow/Black wire between IAC valve and main relay.
  3. Turn ignition off. Reconnect wiring to IAC valve. Unplug PCM connector "A".Turn ignition on. Test for battery voltage between ground and ECM connector terminal A12 (Black/Blue wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short in Black/Blue wire between IAC valve and ECM.
  4. Turn ignition on. Momentarily connect ECM connector terminals A12 (Black/Blue wire) and A10 (Black wire) with a jumper wire several times. If IAC valve clicks, temporarily substitute known good ECM, then retest system. If IAC valve does not click, temporarily substitute known good IAC valve, then retest system. If symptom/indication goes away, replace the original ECM.
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