SAAB WIS ONLINE

Engine torque limitation

Engine torque limitation

The TC/ABS control module sends a torque limitation signal to the Trionic. The signal is a 100 Hz PWM and goes out from pin 13 of the control module.

The different pulse ratios have the following meanings:

9-82 %

Limit engine torque between 0 and 350 Nm. The Trionic converts Nm to mg air/combustion. The value is the maximum air mass/combustion which the TC/ABS control module allows during active TCS modulation when wheelspin exceeds the permitted threshold.

82-84 %

No slip and TC/ABS control module programmed for 4-cylinder engine.

84-86 %

No slip and TC/ABS control module programmed for 6-cylinder engine.

86-88 %

Increase torque to 0 Nm. Sent in the event of tyre slip in conjunction with engine braking when car speed is above 25 km/h. The speed of the car and the amount of slip determine whether the control module chooses 0 or 10 Nm. 0 Nm will be chosen if the slip is slight and 10 Nm if it is more pronounced.

88-90 %

Increase torque to 10 Nm. Sent in the event of tyre slip in conjunction with engine braking when car speed is above 25 km/h. The speed of the car and the amount of slip determine whether the control module chooses 0 or 10 Nm. 0 Nm will be chosen if the slip is slight and 10 Nm if it is more pronounced.





Diagnostics

Trionic monitors the Engine Torque Limitation function. If there is a break/short circuit in the lead for engine torque, Trionic will send a pulse ratio of 96% as an engine torque signal, whereby the TC/ABS control module will generate DTC C0241. The TCS function will be disengaged and the TCS OFF lamp will go out.