Infiniti I35 2002-2004 Factory Service Manual. DTC

Infiniti I35 2002-2004 Factory Service Manual - DTC is a complete diagnostic and troubleshooting guide for the Infiniti I35. It details diagnostic trouble codes (DTCs), with instructions on how to identify, analyze, and repair potential problems. The manual covers all major vehicle systems, including the engine, transmission, electrical system, suspension, and brakes. Ideal for both professional technicians and owners seeking a deeper understanding of diagnostics and maintenance for their Infiniti I35.

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VQ35DE 

1. **Suspension Wear:**  

   Suspension components, such as struts, shocks, and ball joints, tend to wear over time and may need frequent replacement.

   - **Symptoms:** Squeaks, clunks when driving, especially on rough roads, and decreased handling.

   - **Solution:** Replace worn suspension components.

2. **Ignition Coils and Spark Plugs Issues:**  

   Misfires are common in the VQ35DE engine due to faulty ignition coils or worn spark plugs.

   - **Symptoms:** Power loss, rough engine operation, and "Check Engine" light.

   - **Solution:** Replace faulty ignition coils and spark plugs.

3. **Mass Air Flow (MAF) Sensor Malfunction:**  

   The MAF sensor can fail or get dirty over time, impacting engine performance.

   - **Symptoms:** Power loss, "Check Engine" light, uneven engine operation.

   - **Solution:** Clean or replace the MAF sensor.

4. **Transmission Overheating:**  

   The Infiniti I35 sometimes suffers from transmission overheating, which can lead to performance issues or failure.

   - **Symptoms:** Rough shifting, transmission noise, overheating.

   - **Solution:** Install an additional transmission cooler or replace transmission fluid more frequently.

5. **Valve Cover Gasket Leak:**  

   Valve cover gaskets may lose their seal, resulting in oil leaks.

   - **Symptoms:** Oil spots under the car, burning oil smell, smoke from under the hood.

   - **Solution:** Replace the valve cover gasket.

6. **Electrical Issues with the Dashboard and Climate Control:**  

   Electrical problems may occur with the dashboard displays or climate control system, especially in older models.

   - **Symptoms:** Malfunctioning dashboard displays or climate controls, button failure.

   - **Solution:** Repair or replace faulty electrical components.

7. **Rust and Body Corrosion:**  

   Rust is often found along the lower parts of doors and wheel arches, particularly in harsh environments.

   - **Symptoms:** Rust spots, especially on lower edges and wheel arches.

   - **Solution:** Apply rust prevention treatments, repair, and paint affected areas.

8. **ABS System Malfunction:**  

   ABS sensors may fail occasionally, causing the anti-lock braking system to shut off.

   - **Symptoms:** ABS warning light on, non-functional ABS system.

   - **Solution:** Replace faulty ABS sensors.