Infiniti FX35, FX50 (S51) Service & Repair Manual

Infiniti FX35, FX50 (S51) 2009-2013 Service & Repair Manuals. Diagnostic & DTC is a complete guide to diagnosing and repairing the FX35 and FX50 S51 series models. Includes detailed instructions for servicing, troubleshooting, and decoding diagnostic codes (DTCs). The guide covers all key vehicle systems, from the engine and transmission to electronics and suspension. This guide will help owners and mechanics identify and eliminate errors, improve vehicle performance, and extend its service life. Free Download

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Engine: VQ35HR, VK50VE

For the Infiniti FX35 and FX50 (S51) produced from 2009 to 2013, typical faults include engine, transmission, suspension and electronics issues. Let's look at the main problems for both models:

• 1. Engine Issues:

Oil Consumption: The VQ35HR (FX35) and VK50VE (FX50) engines may experience increased oil consumption over time. This is especially true for engines with high mileage. It is important to check the oil level and top it up regularly to avoid serious damage.

Timing Chain: Over time, the timing chain can stretch or wear out, especially on the FX35 with VQ35HR. This can cause noisy idle and poor engine performance.

Catalytic Converter Worn Out: Catalytic converters can deteriorate with age, causing reduced power, abnormal exhaust noise, and even risk of engine damage.

• 2. Transmission Issues:

Automatic Transmission Issues: The FX35 and FX50 are prone to automatic transmission issues. Common symptoms include jerky gear changes, hesitation during gear shifts, and reduced transmission efficiency. This may be due to worn components or software issues.

Overheating of the transmission: When used intensively (for example, in high temperatures or vigorous driving), the automatic transmission may overheat, which will reduce its service life in the long run.

• 3. Suspension issues:

Worn front control arms and ball joints: One common problem is premature wear of the control arms and ball joints. This leads to knocking and vibrations when driving on uneven roads.

Knocking in the rear suspension: The rear suspension is also susceptible to wear, and owners often report knocking and noise in the area of the rear axle.

Worn shock absorbers: Especially on FX50 models with a powerful V8 engine, the shock absorbers and struts can quickly fail due to increased loads.

• 4. Electronic Problems:

Sensor Failures: One of the common problems is the failure of various sensors, including oxygen sensors (lambda probe), mass air flow (MAF) sensors, ABS sensors and tire pressure monitoring systems.

Trip Computer and Navigation System Problems: The electronics in the FX35 and FX50 can fail, causing problems with the navigation, infotainment system and various electronic functions. Sometimes this is due to software glitches that require a firmware update.

Keyless Go System Failures: There have been cases where the keyless entry and start system does not work or works erratically. This could be due to both the key fob battery and problems with the system itself.

• 5. Engine Electronics and Wiring Problems:

Ignition System Failures: This includes problems with the spark plugs and ignition coils, which can cause misfires, loss of power and increased fuel consumption. Wiring Problems: There are problems with corrosion of contacts or damage to the wiring, which causes errors in various electronic systems.

• 6. Cooling System:

Overheating: This is especially true for the FX50 with the VK50VE engine. The powerful V8 engine is prone to overheating if the cooling system is not working properly. Causes may include a faulty radiator, thermostat, or water pump.

Coolant Leaks: There may be leaks from the radiator or connections of the cooling system, which leads to the engine overheating.

• 7. Braking Problems:

Worn Brake Pads and Discs: Due to the heavy weight of the car, the brakes are prone to rapid wear. This can lead to reduced braking efficiency and increased noise levels.

Uneven Disc Wear: Some owners have encountered the fact that the brake discs wear unevenly, which leads to vibrations when braking.

• 8. Other Problems:

Exhaust System Corrosion: Over time, the exhaust system can become corroded, especially in humid climates or on winter roads where de-icing agents are used.

Sunroof Problems: Owners sometimes report that the sunroof is stuck or operates unevenly.