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.
2002 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
TCS Functions
- With the wheel speed sensor signal from 4 wheels, the VDC/TCS/ABS control module detects a wheel spin on the drive wheels. If a wheel spins, the control module controls brake fluid pressure on rear LH and RH, and cuts the fuel to the engine. It also closes the throttle valve to reduce the engine torque. Furthermore, throttle position is controlled to the appropriate engine torque.
- Depending on road circumstances, the driver may have a sluggish feel. This is not abnormal, because the optimum traction has the highest priority by TCS operation.
- When the vehicle is passing through a road where the surface friction coefficient varies, down shifting or depressing the accelerator pedal fully may activate TCS temporarily.
- During TCS operation, it informs a driver of system operation by flashing SLIP indicator lamp.
Factory Service Tools
Use the Manual With the Right Hardware
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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.