Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1995 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
System Test
- 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" (Red wire). If battery voltage is present, go to next step. If battery voltage is not present, check fuses and harness for open circuit.
- Turn ignition off. Disconnect ECM harness connector. Check harness continuity between IACV-AAC connector terminal "B" (Brown/White wire) and ECM (terminal No. 111).
- Continuity should exist. If continuity does not exist, repair wiring as necessary. If harness tests okay, test IACV-AAC valve and inspect ECM connector terminal pins.
NOTE:
On Q45, see ADJUSTMENTS
article for testing and adjustment of fast idle cam.
IDLE SPEED SYSTEM INPUT SIGNALS
| Application | Model Usage | ||||||
|---|---|---|---|---|---|---|---|
| A/C Clutch Signal | (1) Q45 | ||||||
| Battery Voltage | Q45 | ||||||
| Closed Throttle Position Switch | Q45 | ||||||
| Crankshaft Position Sensor | Q45 | ||||||
| Engine (Coolant) Temperature | Q45 | ||||||
| Ignition (START) Signal | Q45 | ||||||
| Mass Airflow Sensor | Q45 | ||||||
| Park/Neutral (Inhibitor) Switch | (2) Q45 | ||||||
| Power Steering Pressure Switch | Q45 | ||||||
| Throttle Position Sensor | Q45 | ||||||
| Vehicle Speed Sensor | (3) Q45 | ||||||
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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.
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