Undervoltage; Intake Valve - Porsche Boxster Technical Manual

45 Anti-lock brake system, diagnosis Boxster
8
Fault, DTC Possible causes, elimination, notes
Test point 15
Undervoltage Control module supply voltage too low (less than 9.5 V).
DTC 4802 Normally, this fault occurs only when the engine is started in combina-
tion with a discharged battery.
-Pull off the control module connector and measure the voltage be-
tween PIN 15 (plus) and PIN 19 (ground).
Nominal value: Vehicle voltage.
-Check wiring and ground point in combination with the wiring diag-
ram.
Test point 16 8
Intake valve The complete hydraulic unit must be replaced if the intake valve is dam-
DTC 5260 aged.
In the intake valve test with the Porsche System Tester 2, select Intake
valve in the Drive links menu.
Perform the test according to the Tester instructions. If the functions
specified in the Tester display: Rear axle locked up / Rear axle still
locked / Release (rear axle free) are not achieved, the following faults
are possible:
-Test sequence not observed.
-Inadequate bleeding of ABD secondary circuit, see Page 45 -D 43.
-Function of the intake valve not OK.
-Return pump operation not OK.
Check pump operation. To do this, select return pump in the Drive
links menu (pump must then run). 8
-Intake or switch-over valve leaks.
8
45 -D 32 45 02 Diagnosis/troubleshooting, anti-lock brake system
986D451 Printed in Germany -3, 1996