1 Check signal with engine tester.
1. Connect special tool 9637.
2. Connect engine tester. Using special input, connect positive cable to pin III/32, negative cable to pin III/46.
3. Start engine or crank engine with starter motor.
The display pictured opposite should appear on the oscilloscope:
2 Check wiring from rpm/crankshaft position sensor to DME control module for open circuit and short circuit.