Diagnosis/ Test Plan For Drive Links; Further To Mils And Information Light; Further To The Return Pump; Further To Front And Rear Abs Solenoid Valves - Porsche Boxster Technical Manual

Boxster Anti-lock brake system, diagnosis 45
8
Diagnosis / test plan (troubleshooting) Further to front and rear ABS solenoid
for drive links valves
(Maintain pressure and Reduce pressure)
The function of the solenoid valves or the return
Further to MILs and information light pump is not OK. If a solenoid valve has a mechan-
ical fault, the fault is not stored in the fault mem-
The corresponding MIL or information light (de- ory.
pending on selection) does not flash. Hydraulic or electrical lines could be swapped.
If a fault is stored in the fault memory, first elimi-
-Check bulb. nate this fault.
-Check wiring from the instrument cluster to
8
the control module according to the wiring di-
OK
Test step "Maintain pressure" not:
agram.
-Brake pedal not pressed or not pressed at
the right time.
-Electrical or hydraulic lines swapped if the ac-
tivated whee! locks up (precondition: corre-
Further to the return pump sponding inlet valve activated with the F8
Return pump does not run after activation. key).
-Inlet valve faulty.
-Perform troubleshooting analogous to test
point 12 (diagnostic trouble code 4266) on Test step "Reduce pressure" not OK:
Page 45 -D 30.
-Brake pedal not actuated.
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-If the activated wheel does not alternately
lock up and then rotate freely again but an-
other wheel (precondition: the parking brake
is not engaged and the selector lever of Tip-
tronic vehicles is in position "N"), the hy-
draulic lines are swapped.
-Outlet valve faulty.
8
45 02 Diagnosis/troubleshooting, anti-lock brake system 45 -D 37
Printed in Germany -3, 1996 986D451