Test Point 1 - Power Supply for DME Control Unit

TEST POINT 1a - Power Supply for Digital Motor Electronics (DME) control unit (V)

Possible Causes, Elimination, Remarks
a) Permanent positive (B+) If there is no B+ at (term 30) the fault memory is cleared




Test procedure: Connect a voltmeter to terminal 24 (-) and terminal 18 (+) of the control unit plug with the help of test leads.

Display: Battery voltage

No display: Check current flow and ground paths in accordance with wiring diagram.

TEST POINT 1b - Power supply of DME control too high/too low - Fault code 1_11

Possible Causes, Elimination, Remarks
b) Power supply via terminal 15




- Check regulator voltage with the engine running.
Specified value approx. 13.8 V.
- Connect a voltmeter to terminal 24 (-) and terminal 27 (+) of the control unit plug with the help of test leads.
- Turn on ignition.

Display: Battery voltage
No display: Check current flow according to wiring diagram.