Speed signals
Speed signals |
The speed of each wheel is obtained from the ABS control module as follows:
Wheel
|
ABS control module pin
|
TCS control module
pin
|
FL
|
17
|
25
|
FR
|
7
|
7
|
RL
|
22
|
24
|
RR
|
19
|
8
|
The signal is a square wave which varies periodically between approx. battery + and 0 V 29 times per wheel revolution. For a stationary wheel the voltage may be either battery+ or 0 V.
If one or more wheels are stationary at the same time as any other wheel exceeds 10 km/h, a diagnostic trouble code will be generated. Should the fault persist for longer than 20 seconds, the TCS OFF lamp will light up and the system will be rendered inoperative.
Similarly, the system will be rendered inoperative if the speed of any wheel exceeds 280 km/h.