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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Auxiliary Air Control (AAC) Valve System Test (NX, SENTRA, Pathfinder & Pickup)

Auxiliary Air Control (AAC) Valve System Test (NX, SENTRA, Pathfinder & Pickup)

  1. Start engine and bring to operating temperature. Check idle speed. See SERVICE & ADJUSTMENTS SPECIFICATIONS article. Adjust idle speed if necessary. See 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 White/Green wire (NX 1.6L and Sentra 1.6L), Red/Black wire (NX 2.0L and Sentra 2.0L) or Black/White wire (Pathfinder and Pickup). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 10-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 (Sky Blue wire on NX and Sentra), Orange wire (Pathfinder and Pickup 3.0L) or (White/Green wire on Pickup 2.4L) and corresponding wire of AAC valve harness connector. Continuity should exist. If continuity exists, check AAC valve. See AUXILIARY AIR CONTROL (AAC) VALVE TEST (EXCEPT MAXIMA VG30E). If AAC valve is okay, check ECM pin terminals and ECM harness connector terminals for damage or corrosion. Repair as necessary. If continuity does not exist, repair open in harness or connectors.
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