With Traction Control

- To calculate if there is wheelspin on any of the drive wheels, the control module receives information on the speed of the front wheels. The speed of the rear wheels is used as a reference, which is why this information is also received by the control module.
- The wheel speed for each wheel is taken from the Antilock Brake System (ABS) control module as follows:

Wheel: FL
Pin on ABS control module: 10
Pin on Traction Control System (TCS) control module: 25
Wheel: FR
Pin on ABS control module: 11
Pin on TCS control module: 7
Wheel: RL
Pin on ABS control module: 12
Pin on TCS control module: 24
Wheel: RR
Pin on ABS control module: 9
Pin on TCS control module: 8

- The signal is a 60 millisecond long ground pulse which the ABS control module sends 92 times per wheel rotation. When the wheels are stationary, the ABS control module sends pulses with a frequency of 14.25 Hz as a test signal.
- If one or more wheels are stationary at the same time as the speed of another wheel is greater than 10 km/h, a diagnostic trouble code is registered by the system. If the fault remains for more than 20 seconds, the TCS OFF lamp lights and the system is disengaged.
- The system is disengaged in the same way if the speed of any of the wheels exceeds 280 km/h.







- The Traction Control System (TCS) control module receives information about the current engine speed via pin 6 from pin 43 on the MOTRONIC control module.
- Information about the engine speed is essential so that:

the control module can use this and information about the positions of the main and TCS throttles to calculate the engine torque.

the control module can use this and the speed signals from the wheels to calculate the gear positions.

- The signal is a square wave of approx. 37 Hz while idling and approx. 125 Hz at 2500 rpm.
- If the signal is wrong or there is an interruption/short in the circuit, diagnostic trouble codes are registered by the system. The TCS OFF lamp lights and the system is disengaged.