Fault, DTC Possible causes, elimination, notes · Test point 11

911 Carrera (996) Anti-lock brake system diagnosis Fault, DTC Possible causes, elimination, notes Test point 11 Valve supply Required display: Valve relay picked up. voltage The System Tester 2 can be used to determine whether the valve DTC 4276 relay has picked up or dropped out. Select "Valve relay" in the Input signalsmenu. "Valve relay picked up" or "Valve relay dropped out" then appears in the Tester display. If the control module connector was pulled oft, first switch oft the ignition before the test and then switch it on again, as the valve relay will otherwise not pick up. The valve relay also can be in the dropped-outstate if there is another system fault. (ABSvalve fault.) The complete hydraulic unit with integrated valve relay must be replaced if the valve relay is damaged. Important: Before replacing the hydraulicunit, check whether: ground is connectedto control module connector PIN 16 (from ground point 2) and PIN 19 (from electronics ground). The locations of the ground points are shown on the wiring diagram Groundpoints. plus (vehiclevoltage) is connected to control module connector PIN 17 and PIN 18. If all test steps are OK, replace the hydraulicunit. 54O_96 4502 DiagnosisjTroubleshooting 45 -D 29 Printed in Germany -12, 1998