The clutch switch and the gear detection switch provide the means by which power transmission is monitored when the vehicle is being driven. They are also used by the cruise control system.
The clutch switch is mounted on the clutch pedal and takes the form of a Hall-effect sensor. It is used to detect operation of the clutch. When the clutch is disengaged, engine functions may be activated (e.g. idling speed control) or deactivated (e.g. overrun fuel shut-off). In addition, cruise control may also be suspended.
The gear detection switch is mounted on the gear lever. This switch is used to detect whether a gear is engaged. As with the clutch switch, the gear detection switch activates/deactivates certain engine functions. In addition, cruise control may also be affected.
Analysis of the clutch switch signals and the gear detection switch signals by the digital engine module (DME) is used to diagnose the transmission of power from the engine via the clutch to the driving wheels. The two switches are connected in series. On the basis of those signals and other engine operating parameters, handling dynamics functions are controlled by the DME.
In the event of fault on one of the switches, the following fault is stored in the DME fault memory:
This fault is registered if at least one of the following conditions is met:
In order to locate the fault, the following test module in the diagnosis program should be used:
If power transmission faults are diagnosed, handling dynamics functions are shut down for safety reasons. In addition, cruise control is disabled.