Dynamic Stability Traction Control(DSTC)

Dynamic Stability Traction Control(DSTC)  - Stability system - Starting and driving - Volvo XC90 Owners Manual - Volvo XC90
DSTC was standard equipment on the XC90 since its debut in 2003.

The stability system consists of a number of functions designed help reduce wheel spin, counteract skidding, and to generally help improve directional stability.

NOTE
A pulsating sound will be audible when the system is actively operating and is normal.

Traction control (TC)
This function is designed to help reduce wheel spin by transferring power from a drive wheel that begins to lose traction to the wheel on the opposite side of the vehicle (on the same axle).

TC is most active at low speeds.

This is one of DSTC’s permanent functions and cannot be switched off.

Spin control (SC)
The spin control function is designed to help prevent the drive wheels from spinning while the vehicle is accelerating.

Under certain circumstances, such as when driving with snow chains, or driving in deep snow or loose sand, it may be advisable to temporarily switch off this function for maximum tractive force.

Temporarily switching off Spin control

Temporarily switching off Spin control
1. Turn the thumbwheel (1) on the left-side steering wheel lever until the DSTC menu is displayed.
2. Hold down the RESET button (2) to toggle between DSTC SPIN CONTROL ON or OFF.

NOTE
• The message DSTC SPIN CONTROL OFF indicates that the stability system’s spin control function has temporarily been switched off.
• The stability control indicator light will illuminate and remain on until spin control has been reactivated.
• The spin control function is automatically enabled each time the engine is started.
• DSTC ON indicates that all system functions are active.

Active Yaw Control (AYC)
This function helps maintain directional stability, for example when cornering, by braking one or more of the wheels if the vehicle shows a tendency to skid or slide laterally.

This is one of DSTC’s permanent functions and cannot be switched off.

WARNING
The car’s handling and stability characteristics will be altered if the DSTC system functions have been disabled.

DSTC-related messages in the text window
• TRACTION CONTROL TEMPORARILY OFF – The system has been temporarily switched off due to high brake temperature and will automatically switch on again when the brakes have cooled.
• “ANTI SKID SERVICE REQUIRED” – the system has been automatically disengaged due to a fault. A trained and qualified Volvo service technician should check the system.