Test Point 27 - Combi-Instrument Input

TEST POINT 27 - Combi-instrument input (Display as of M-program) - Fault code 56

Possible Causes, Elimination, Remarks
No diagnosis possible.

Detectable faults: Open circuit/short to ground, short to positive

1) Turn manual program on and off
Check display on instrument

2) Pull off ECU connector. Connect pin 13 to ground. Display o.k.: ECU faulty

3) Check wiring of ECU pin 13 to speedo pin 9.

Wiring o.k. Speedometer faulty