1994 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE

Auxiliary Air Control (AAC) Valve System Test

  1. Start engine and bring to operating temperature. Check idle speed. See SPECIFICATIONS article in the ENGINE PERFORMANCE section. Adjust idle speed if necessary. See ADJUSTMENTS article in the ENGINE PERFORMANCE section.
  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 (1.6L), Red/Black wire (2.0L). 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) and corresponding wire of AAC valve harness connector. Continuity should exist. If continuity exists, check AAC valve. See AUXILIARY AIR CONTROL (AAC) VALVE TEST. 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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