If no fault is found proceed with

If a break or short to the positive side or to earth/ground is present, pull off the motor relay. Check the wiring between terminal 85 at the relay base and PIN 5 at the control unit plug, and and between terminal 86 and PIN 20.

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

Motor Porsche 911 Carrera

614A-D39/45

2. Pull off the motor relay. The car's electrical system voltage (app. 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 at 4.

If the return pump runs:

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

Fault, Fault Code

Possible Causes, Elimination, Remarks

4. Check connections at earth/ground wire (1) and positive wire (2) for contact resistance.

Bridge terminals 30 and 87 at the relay base and check that the electric current is reaching connecting point (3). If the current is present at this point (but the return pump is not running): renew hydraulic unit (defective return pump).

1. Check control unit plug for continuity.

PIN 18 against PIN 23 PIN 18 against PIN 17

2. Pull of the valve relay at the hydraulic unit.

Check whether there is a short to the positive side or to earth/ground in the circuit as descr. in Item 1. For this check, measure at PIN 18.

3. Measure internal resistance of front-rear locking valve.

Desired value is 2...4 Q between PIN 2 and PIN 4 at the valve block. If desired value is not obtained: renew the valve block.

Wiring Diagram For Porsche 911 964

614B-D39/45

15: Front-rear differential Proceed in general as for fault code -11 -lock valve Fault code - 41 -

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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