Important Infonnation About Abs 5.3 And Abs/Tc 5.3; Differences Between Abs 5.3 And Abs/Tc 5.3 - Porsche Boxster Technical Manual

Boxster Anti-lock brake system, diagnosis 45
8
Important infonnation about ABS 5.3 and ABS/TC 5.3
General Differences between ABS 5.3 and
ABSjTC 5.3
The Porsche Boxster is fitted as standard with
an anti-lock brake system (ABS 5.3). ABS 5.3 = 3-channel system
"Traction Control (TC)" can be obtained on (diagram: see Page 45 -D 7).
special request on the basis of ABS 5.3.
Traction Control (TC) is a combination of anti- A~S;rC 5.3 = 4-channel system
slip control (ASR) and Automatic Brake Differen- (diagram: see Page 45 -D 9).
tial (ABD). The essential distinguishing features between
TC is a further system for increasing driv- ABS and ABS;rC are:
ing safety.
ABS 5.3 is optimised with regard to installed vol- -Number of brake lines at intermediate piece
ume and weight compared with the ABS 5 (No.8 / Figure 181 -96):
8 (ABS 5 in the 993). Control module (No.1), hy- ABS 5.3 = 3 brake I~nes
draulic unit (No.7), pump motor relay and valve ABS;rC 5.3 = 4 brake lines
relay (No.2) of ABS 5.3 and ABS;rC 5.3 are a
unit that is positioned next to the master brake
cylinder. -TC OFF switch for switching driving stability
control on and off is not available on vehicles
with Solo ABS (ABS 5.3).
-TC (ASR/ABD) MIL and
TC (ASR/ABD) function light
(information light) in vehicles with ABSjTC.
These lights are lit when the ignition is
switched on (lamp check).
In vehicles with ABS 5.3 (Solo ABS) these
lamps are not fitted in the instrument clus-
8 ter.
A figure showing the warning (MIL) and func-
tion lights is on Page 45 -D 10.
Diagnosis and system checks on both sys-
tems are carried out with the Porsche System
Tester 2.
8
45 02 Diagnosis/troubleshooting, anti-lock brake system 45 -D 5
Printed in Germany -3, 1996 986D451
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