Front Right Speed Sensor; Rear Right Speed Signal; Rear Left Speed Signal - Porsche Boxster Technical Manual

Boxster Anti-lock brake system, diagnosis 45
8
Fault, DTC Possible causes, elimination, notes
Further to test 2
Display all four wheels in the Tester display.
Drive straight ahead at a uniform speed of approx. 2-4 km/h and have
a second person observe the Tester display.
Required display: Deviation between the wheel speeds of the four
wheels max. 1 km/h.
Further details about tests 1 and 2 are given under "Actual values
menu" on P. 45 -D 38.
Possible faults (cause in the event of deviation)
-Air gap between speed sensor and gear wheel (pulse wheel) too
large or, due to wear (chip formation), too small (check installation).
-Pulse wheel defective or corroded.
8 -Wheel bearing damage (wheel bearing not adjustable).
-Plug connection in wiring from the speed sensor to the control mo-
dule or PIN on the control module connector not OK.
Test point 3
Front right General procedure as for test point 2/diagnostic trouble code 4206
speed sensor, (check speed sensor signal with the Porsche System Tester 2).
signal implausible -Speed sensor signal: Go to the Actual values menu. There, select
DTC 4201 the front right wheel speed.
Test point 4
Rear right General procedure as for test point 2/diagnostic trouble code 4206
speed signal, (check speed sensor signal with the Porsche System Tester 2).
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signal implausible -Speed sensor signal: Go to the Actual values menu. There, select
DTC 4211 the rear right wheel speed.
Test point 5
Rear left General procedure as for test point 2/diagnostic trouble code 4206
speed signal, (check speed sensor with the Porsche System Tester 2).
signal implausible -Speed sensor signal: Go to the Actual values menu. There, select
DTC 4216 the rear left wheel speed.
8
45 02 Diagnosis/troubleshooting, anti-lock brake system 45 -D 25
Printed in Germany -3, 1996 986D451
cco"