2002 Volvo S60
pg. 143 Stability system
Stability and Traction Control (STC) - Anti-spin system - T5 (option on 2.4/2.4T)
The STC system is designed to help reduce wheel spin by limiting power to the drive wheels if they
begin to lose traction. At speeds over 25 mph (40 km/h), the STC system monitors and compares all four
wheels. If one of the drive (front) wheels shows any tendency to slip, such as when driving on slippery
roads, the difference in speed is immediately detected. This triggers a signal to the engine management
system, which will reduce engine torque (by reducing fuel) until the differential is corrected. This torque
reduction is handled in stages, and reaction time is extremely fast. The system can be switched on or off
by pressing the button on the center console for at least half a second (see
). The text window
will briefly display "STC off" and the indicator light
in the instrument panel will be ON when you
have switched the system off. The STC system comes on each time you start your car.
The STC indicator light
will come on for approximately 2 seconds when the engine is started as the
system performs a self-diagnostic test.
This system should be switched off if you, for any reason, temporarily have to drive with tires of
different dimensions (e. g., spare tire).
will flash when STC is actively regulating power to the drive wheels. Normal power
may be reduced at this time. This is normal as power is momentarily reduced to help keep the drive
wheels from losing traction and spinning.
If the STC system has been switched on using the button in the center console (the indicator light will
normally go off) and the indicator light remains on, there is a fault in the system. In this case:
Stop the car in a suitable place and switch off the engine.
Restart the engine.
If the indicator light goes off, no further action is required.
If the light remains on, have the STC system inspected by an authorized Volvo retailer.
pg. 144 Stability system
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