Test Point 17 - Hall signal
TEST POINT 17 - Hall signal - Fault code 1_34Possible Causes, Elimination, Remarks
To check the Hall signal, disconnect plug at the cylinder head behind the camshaft sprocket and insert 3-pin adapter lead (VW 1501). Connect oscilloscope to terminals 1 and 2 of the adapter lead, start engine.
If the Hall system is O.K., this signal must be displayed:
If the Digital Motor Electronics (DME) control unit detects a missing Hall signal, ignition timing is retarded by approx. 6° in all rpm ranges.