Sensor Heating Relay (Engine M 20 Only)

Sensor Heating Relay (Engine M 20 only):

Check function:

•D• 300 - This activation is only possible in the case of the DME M1.3, it takes place at one second intervals.

The relay remains switched on during normal operation until high engine speeds or load occur.

Possible causes:

- Wire to DME control unit Pin 23 defective

- Relay or voltage supply not OK.