System Test (Abs And Abs/Tc) - Porsche Boxster Technical Manual

Anti-lock brake system, diagnosis
Boxster
System test (ABS and ABSlrC)
Important notes
1. A system test (function test) must be per-
formed if work is performed on the hydraulic
unit No.1, the speed sensors and the wiring
harness or if the hydraulic unit is exchanged.
This is the case after accident repairs, for
example. This prevents electrical and hy-
draulic lines from being swapped and ensures
flawless operation of the system.
3. The system test is not menu-prompted (pro-
gram-guided).
The system test consists of several test
steps and is performed via different menus.
Observe the specified sequence when perfor-
ming the system test.
The static test must be performed at the
start of the system test.
Remedy any detected fault before proceeding
with the system test.
On vehicles with TC, the version coding must
be checked or corrected before the static
test is performed.
2. A system test also has to be performed if
certain brake lines are replaced, e.g. on the in-
termediate piece No.8. Unintentional bending
of the brake lines could lead to incorrect hy-
draulic allocation, despite the different
thread sizes used (M12 x 1 and M 10 x 1).
4. As fewer test steps are required on vehicles
with Solo ABS (without TC) (several compo-
nents are not installed), the TC-specific test
steps are not displayed in the corresponding
menu during the Solo ABS system test.
Test step No. I, Nos. 6...10, Nos. 18...19
and No. 24 are therefore not necessary (not
possible) with the Solo ABS.
5. After the system test, take the vehicle on a
test drive and make sure that a controlled
braking operation (ASS control operation) is
performed.
45 02 Diagnosis/troubleshooting, anti-lock brake system
986D451 Printed in Germany -3. 1996
45 -D 46