1994 Infiniti J30FACTORY OEM SERVICE PROCEDURE

System Test

  1. Start engine, and warm to operating temperature. Check Idle speed. If idle speed is excessive, disconnect IACV-AAC valve harness connector, idle speed should drop. If idle speed does not drop, check for battery voltage at IACV-AAC connector terminal "A" (Green/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, check fuses and harness for open circuit.
  2. Turn ignition off. Disconnect ECM harness Connector. Check harness continuity between IACV-AAC connector terminal "B" (Blue wire) and ECM (terminal No. 4). Continuity should exist. If continuity does not exist, repair wiring as necessary.
  3. If harness tests okay, test IACV-AAC valve and inspect ECM connector terminal pins.
IDLE SPEED SYSTEM INPUT SIGNALS

Application Model Usage
A/C Clutch Signal (1) J30
Battery Voltage J30
Closed Throttle Position Switch J30
Crankshaft Position Sensor J30
Engine (Coolant) Temperature J30
Ignition (START) Signal J30
Park/Neutral (Inhibitor) Switch (2) J30
Power Steering Pressure Switch J30
Throttle Position Sensor J30
Vehicle Speed Sensor J30
(1) Signal received from automatic A/C amplifier.
(2) Signal received from transmission control unit.
Factory Service Tools

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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.