Infiniti Q40 (V36) Service & Repair Manuals, EWD

This is a comprehensive guide designed for professional mechanics and car owners, containing all the necessary information on diagnostics, maintenance and repair. The guide covers all key vehicle systems, including the engine, transmission, suspension, brake system, and electrical circuits (EWD). Clear step-by-step instructions, illustrations and technical data will help you carry out work accurately and efficiently, ensuring the durability and reliability of your Infiniti Q40. Free Download PDF

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Engine: VQ37VHR

Transmission: 7AT: RE7R01A

Timing chain wear:

Over time, the timing chain can stretch, causing poor engine performance and abnormal noise.

Signs: Engine noise, especially when starting, and loss of power.

Solution: Check and replace the timing chain and tensioners.

Oil leak:

Oil leaks from the valve cover gaskets are common, which can cause poor engine performance over time.

Signs: Oil smell, smoke from the engine compartment.

Solution: Replace the valve cover gaskets.

Ignition coil problems:

Ignition coils can fail, causing rough engine operation or misfires.

Signs: Rough engine operation, loss of power, errors on the instrument cluster.

Solution: Replace faulty ignition coils.

Transmission problems (7-speed automatic):

In some cases, jerking and jolting may occur when shifting gears, especially at low speeds.

Signs: Harsh gear shifting, delays when shifting.

Solution: Carry out gearbox adaptation, oil change or repair.

Cooling system problems:

The radiator or thermostat may fail, which can lead to engine overheating.

Signs: Increased engine temperature, coolant leaks.

Solution: Check and replace faulty cooling system components.

Worn brake discs and pads:

Rapid wear of brake pads and discs is a common problem, especially on cars with aggressive driving.

Signs: Squeaking or knocking when braking, reduced braking efficiency.

Solution: Regularly replace brake pads and discs.

Suspension problems (stabilizer struts):

Worn bushings and stabilizer struts can cause knocking in the suspension when driving over uneven surfaces.

Signs: Knocking in the front or rear suspension.

Solution: Replace the stabilizer struts and bushings.

VVEL (Variable Valve Event and Lift) system malfunctions:

Problems with the variable valve timing and valve lift system can cause unstable engine operation.

Symptoms: Rough idle, loss of power.

Solution: Diagnose and repair the VVEL system.

Electronic problems:

Sometimes there may be malfunctions in the electronics, such as problems with the keyless entry system, navigation or multimedia system.

Symptoms: Incorrect operation of electronics, errors appearing on the dashboard.

Solution: Reflashing or repairing faulty electronic components.