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Checking the pedal switch and selectorlever position sensor (automatic transmission)

Checking the pedal switch and selector lever position sensor (automatic transmission)



1. Connect the BOB and check that about 12 V is present across pin D (4) of the Cruise Control connector and a good ground (selector lever in position D, 1, 2 or 3).

There should be zero voltage (0 V) when the selector lever is in position P, R or N.

2. If the voltage reading is not OK, check that about 12 V is present on pin 2 of the brake pedal switch when the selector lever is in position D, 1, 2 or 3 and 0 V when it is in position P, R or N.




If the voltage is OK, continue with point 5.

3. If the voltage is not OK, check that about 12 V is present on pin 4 of the selector lever's 7-pin connector.


If the voltage is OK, continue with point 4.

If the voltage is not OK, measure the resistance across the load side of the fuse and pin 4 of the selector lever's 7-pin connector.

If the resistance is > 1 ohm, check the wiring and rectify the fault.

4. Check the wiring for continuity or a short circuit by measuring the resistance across pin 3 of the selector lever's 4-pin connector and pin 2 of the brake pedal switch connector.


If the resistance is > 1 ohm, the fault is in the selector lever.

Check or adjust the selector lever as described in Service Manual 4:2 "Automatic transmission".

If the resistance is > 1 ohm, check the wiring and rectify the fault.

5. Measure the resistance across pins 1 and 2 of the brake pedal switch when the brake pedal is depressed and also when it is not depressed.


If the resistance with the pedal in the normal position (not depressed) is > 1 ohm, adjust the pedal switch or perhaps fit a new one.

Depressing the pedal breaks the circuit. If resistance can be measured in the circuit, fit a new pedal switch.

6. If the pedal switch is OK, check the wiring for continuity or a short circuit by measuring the resistance across pin 1 of the brake pedal connector and pin D (4) of the Cruise Control connector.


The resistance should be > 1 ohm.