Speed Signal

WARNING: If the front (driven) wheels have to be raised (to generate speed signals), all necessary safety measures must be taken.
This is to prevent the wheels from touching the floor or coming into contact with any loose objects or equipment.


To carry out the test correctly, the engine should be running and a gear should be engaged.
1 Check that the speedometer is in working order.
If it is, continue with point 2.
If it is not, continue fault diagnosis as described in the "Speedometer" section of Service Manual 3:2 "Electrical system, system diagrams, operation and fault-tracing".
2 Connect a BOB to the Cruise Control system control module and measure the speed pulses on pin K (10) with the engine running and the front (driven) wheels either rotating or stationary.
For this to work properly, depress the brake pedal to stop the driven wheels and then release the brake so that the wheels can rotate again. Repeat this procedure until test readings are obtained.
The test readings should be 0 or about 12 V DC (stationary wheels), depending on the stop position of the sensor, and 6 V DC (rotating wheels).







3 It no signal is present, check the wiring.
To check the wiring for continuity or a short circuit, measure the resistance across pin K (10) of the Cruise Control connector and pin 2 of the speedometer connector.
If the resistance is > 1 ohm, rectify the fault.
If the resistance is ≤ 1 ohm, continue fault diagnosis as described "Befor Control Module Replacement".