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Home >> Nissan-Datsun >> 1996 >> Pickup Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing 2.4L >> Idle Control Systems >> Auxiliary Air Control (AAC) Valve System Test
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Auxiliary Air Control (AAC) Valve System Test

  1. Start engine and bring to operating temperature. Check idle speed. Adjust idle speed if necessary. See the ADJUSTMENTS article.
  2. Disconnect AAC valve harness connector. Idle speed should drop. If idle speed drops, system is functioning properly. If idle speed does not drop, turn ignition off. With AAC valve harness connector disconnected, turn ignition on.
  3. Measure voltage between ground and AAC valve harness connector Black/White wire. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 15-amp fuse located in fuse and relay box under left instrument panel. If fuse is okay, repair or replace harness or connectors between AAC valve and fuse box.
  4. Turn ignition off. Disconnect ECM harness connector. Check continuity between ECM harness connector terminal No. 113 (White/Green wire) and corresponding wire of AAC valve harness connector. Continuity should exist. If continuity does not exist, repair open harness or connectors. If continuity exists, check AAC valve. See AUXILIARY AIR CONTROL (AAC)  VALVE. If AAC valve is okay, check ECM terminals, harness, and connector terminals for damage or corrosion. Repair or replace as necessary.
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