SAAB WIS ONLINE

(521-2476) Fault diagnosis, hydraulic unit TCS/ESP

TECHNICAL SERVICE BULLETIN
Bulletin Nbr: 521-2476
Date: ........... Juni 2004
Market: ej US/CA
Fault diagnosis, hydraulic unit TCS/ESP

Cars affected

Saab 9-3 (9440) M03-

Background

A method for fault diagnosis for internal leaks in the hydraulic unit has been developed. The method is being introduced in WIS 2004-4.

Parts required

Cylindrical pin with 6 mm diameter and minimum length of 50 mm or bolt M6x60 mm (x2).

Suitable O-ring e.g. 6 x 1.25 mm (x2).

Procedure


1. Thread the O-rings onto the bolts/pins. If bolts are used then the O-ring must be fitted above the thread. The O-ring is used for position marking.


2. Remove both rubber plugs on the hydraulic unit.


3. Insert the pins/bolts down into each respective hole. Check that the O-rings are lying against the surface of the hydraulic unit. If the head of the bolt is touching the brake pipes, saw off the head of the bolt or carefully bend the brake pipes away.


4. Get a colleague to start the car.

5. Depress the brake pedal and then release it after a short time.


6. Check whether any of the pins/bolts move up/down. Repeat the procedure a couple of times.

7. If movement can be detected in any of the pins/bolts then there will be leakage in the unit's valves. Replace the hydraulic unit in accordance with WIS Brakes - TCS/ESP - Adjustment/Replacement - Hydraulic unit.

Note

The control module shall be re-used on the new unit.


8. If none of the pins/bolts move then the fault is in another of the brake system's components. Remove the pins/bolts and refit the rubber plugs before continuing fault diagnosis.


Warranty/Time Information

In the case of customer complaint and if the car is within the warranty period , use the following information to fill out the claim:

Failed Object: 52151

Location code: 09

Repair/Action code: 08

Time: 0.1 hr