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.
1996 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
System Test
- Start engine, and warm to operating temperature. Check idle speed. If idle speed is excessive, disconnect IAC valve harness connector. Idle speed should drop.
- If idle speed does not drop, check for battery voltage at IAC valve 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 IAC valve connector terminal "B" (Brown/White wire) and ECM terminal No. 101.
- Continuity should exist. If continuity does not exist, repair wiring as necessary. If harness tests okay, test IAC valve and inspect ECM connector terminal pins for corrosion or damage.
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 Switch | (3) Q45 | ||||||
| Power Steering Pressure Switch | Q45 | ||||||
| Throttle Position Sensor | Q45 | ||||||
| Vehicle Speed Sensor | (2) Q45 | ||||||
|
|||||||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.