DME 7.8 DME 7.80 · Diagnosis/Troubleshooting

DME 7.8 DME 7.80 Diagnosis/Troubleshooting Note! ♦Fuel tank ventilation diagnosis is initiated with the Porsche System Tester 2 in the "Short test" menu. This reduces the time elapsed after engine start-up to 30 seconds. ♦The EVAP canister purge valve is very sensitive to contamination. If the lines to the EVAP canister have to be detached, the outside of the canister must be cleaned beforehand. Work instruction Display OK If not OK 1 Check shutoff valve for ♦Remove front right-hand wheel Replace shutoff leaks housing liner valve ♦Detach connector of shutoff valve ♦Detach ventilation line of shutoff valve ♦Connect shutoff valve to the bat- tery or a separate power supply unit via special tool V.A.G.1315A/1. ♦Do not actuate the shutoff valve for more than 5 minutes (over- load) ♦Connect special tool 9160/1 to EVAP canister ♦Using special tool 9160/1, gen- erate a vacuum of 100 mbar (0.1 bar) 0-75.1 page 2 2023 P0456 p0456 Printed in Germany – 6, 2002