Test Point 1 - Power supply

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

Possible Causes, Elimination, Remarks
a) Permanent positive (term. 30) 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 unit (V) too high/too low - Fault code 1_11

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

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