Oscilloscope Patterns and Waveforms

Comparison Images EWS Oscilloscope Measurement (DME/DDE)

IMPORTANT: The DME/DDE must remain connected for the duration of the test-measurement routine. The CAS control unit should not be enabled. It transmits a continuous EWS immobilizer signal whenever Terminal 15 is hot.







Graphic 1: Signal OK.
Please note that the "OK" assessment relates exclusively to the data wire and the signal shape. It cannot be determined whether the transmitted code is correct.







Graphic 2: Signal NOT OK.
The above signal indicates a fault in the DME/DDE.







Graphic 3: Signal NOT OK
The above signal indicates a wire fault or a fault in the CAS.







Fig. 4: Signal NOT OK
The above signal indicates a short circuit to positive.







Fig. 5: Signal NOT OK
The above signal indicates a short circuit to earth or an open wire/circuit.