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.
2003 Infiniti FX45FACTORY OEM SERVICE PROCEDURE
Diagnostic Procedure
- If using CONSULT-II, go to next step. If using generic scan tool, go to step 3 .
- Turn ignition on. Select SELF-DIAG RESULTS mode with CONSULT-II. Press ERASE. Perform DTC CONFIRMATION TEST "A" again. If 1st trip DTC is detected, go to step 4 . If 1st trip DTC is not detected, test is complete.
- Turn ignition on. Select MODE 4 with scan tool. Press ERASE. Perform DTC CONFIRMATION TEST "A" again. If 1st trip DTC is detected, go to next step. If 1st trip DTC is not detected, test is complete.
- Replace ECM.
- Perform initialization of NATS system and registration of all NATS ignition key IDs.
- Perform accelerator pedal released position learning. See ACCELERATOR PEDAL RELEASED POSITION LEARNING under PROGRAMMING. Perform throttle valve closed position learning. See THROTTLE VALVE CLOSED POSITION LEARNING under PROGRAMMING. Perform idle air volume learning. See IDLE AIR VOLUME LEARNING under PROGRAMMING.
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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