Test Point 3 - Speed Sensor
TEST POINT 3Speed Sensor
Note: This test is only possible with help of an oscilloscope.
Tune in oscilloscope to supplier's instructions.
1. Disconnect center plug (2) in engine compartment at left side on plug plate.
2. Connect oscilloscope on center and lower flat male plugs of engine end plug section with help of test leads.
3. Crank engine with starter. Screen should display sine oscillation, the amplitude of which must be greater than 2.5 volts from peak to peak.
If sensor signal is weaker than 2.5 volts or no signal is displayed, check connections, sensor and distance to gear ring.
Measure internal resistance of term. 8 against term. 27 on DME multiple pin plug or on speed sensor plug section.
Specification: 0.6 to 1.6 k-ohms
Replace speed sensor, if necessary.