Mechanical Outline

Mechanical outline

Wheel bearings




Wheel bearings must be free of play. If there is too much play in bearings, this may affect signals from the wheel sensors to the control module, and cause wheel sensor DTCs to be posted.

Pulse wheel




If the pulse wheel is loose or damaged, this may affect signals from the wheel sensors to the control module, and cause wheel sensor DTCs to be posted.

Wheel sensors




If wheel sensors are loose or badly fitted, this can affect signals to the control module. Wheel sensors must be firmly in the correct position relative to the spindle/wheel shaft (sensor towards end position), otherwise wheel sensor DTCs may be posted.

Wheel stuck




If a wheel will not move or sticks when moving off or driving because the brakes are badly adjusted, sticking or frozen solid, this may cause wheel sensor DTCs to be posted.

Brake discs




In cars fitted with TRACS, the control module continuously monitors how much TRACS is used, and uses this data to calculate the estimated brake disc temperature (on the driving wheels).
If TRACS is used so much that there is a risk of overheating the brake discs, a DTC may be posted.