System test Possiblecauses,elimination, notes · Test steps 12 -19

911 Carrera (996) Anti-lock brake system diagnosis System test Possiblecauses,elimination, notes Test steps 12 -19 In the Drive links menu, Test step 12: Maintain pressure, front left check the inlet and outlet Test step 13: Reducepressure, front left ABS solenoid valves in the hydraulic unit for function Test step 14: Maintain pressure, front right and incorrect allocation. Test step 15: Reduce pressure, front rightRotate all four wheels individually(one after the Test step 16: Maintain pressure, rear left (or rear with Solo ABS) other according to the test-step sequence).When Test step 17: Reduce pressure, rear left (or rear with Solo ABS) doing this, carefully follow Test step 18: Maintain pressure, rear right the instructions in the Tester display. Test step 19: Reduce pressure, rear right (Test steps 18 and 19 only on vehicles with TC)On the Solo ABS, the test of the rear-axlevalves (test steps 16...17) can be performed on the right or Test step "Maintain pressure" not OK: left wheel. 1. Hydraulic lines incorrectly allocated if the activated wheel locks up (precondition: inlet valve activated with the F8 key). Incorrect allocation of electrical wires is another possibility if impermissible repairs were made on the wiring harness after accident repairs. 2. Inletvalvefaulty. Test step "Reduce pressure" not OK: 1. If the activated wheel does not alternately lock up and then rotate freely again but another wheel does this (precondition: the parking brake is not engaged and the selector lever of Tiptronic vehicles is in position "N"), the hydraulic lines are swapped. 2. Outletvalvedefective. Troubleshooting: Perform troubleshooting analogous to test point lOon P. 45 -D 28. 45 -D 51