Test Point 14

DTC 35

Return Pump





1. Switch off the ignition. Pull off the plug at the control unit. Check control circuit (wire with relay) - PIN 20 to PIN 5 - for discontinuity and short circuit to ground/To plus.

If no fault is found, proceed with 2.

If there is a discontinuity, short circuit to plus or to ground, pull off the motor relay. Check wiring between terminal 85 at the relay base and PIN 5 on the control unit plug, and between terminal 86 and PIN 20.

If the wiring is in working order: Replace the motor relay.





2. Pull off the motor relay. Battery voltage (approx. 12 volt) must be present at terminal 87 of the relay base.

3. Bridge terminals 30 and 87 at the relay base. If the return pump does not run, continue with 4.

If the return pump runs:

- Check wire from terminal 30 on the relay base to PIN 31 at the control unit plug. If the wire is in working order: Replace the motor relay.





4. Check connections at ground wire (1) and plus wire (2) (contact resistance).

Bridge terminals 30 and 87 at the relay base and check whether voltage is present at the connection point (3).

If voltage is present (but the return pump is not running): Replace the hydraulic unit (defective return pump).