DME 7.8 DME 7.80 · Work instruction Display OK

DME 7.8 DME 7.80 Work instruction Display OK If not OK 3 Check fuel pressure regu- ♦Remove vacuum hose from fuel 0.4 - 0.6 bar Check the intake air lator, vacuum connection pressure regulator system for leaks and fuel return line and check vacuum ♦Connect special tool 9103/2 to line to fuel pressure vacuum hose regulator for restric- ♦Start the engine tions. ♦ ♦Check housing of fuel pressure Replace the fuel regulator for damage and defor- pressure regulator if mation it is damaged with the result that the spring pre-tension- ing is increased 4 Check EVAP canister ♦Disconnect hose from EVAP can- The vacuum must purge valve ister purge valve to intake sys- not fall below 0.5 tem at EVAP canister purge bar after 10 minutes valve ♦Remove connector of EVAP can- ister purge valve ♦Connect special tool 9160/1 to EVAP canister purge valve ♦Generate vacuum of approx. 0.7 bar 5 Check fuel injectors for leaks 418 Oxygen Sensing Error by means of Short Test, Bank 1 - Above Limit Diagnosis conditions • Mixture adaptation performed with the Porsche System Tester 2 Possible fault cause ♦Incorrect signal from MAF sensor ♦Intake air system leaking ♦Fuel pressure too low ♦Volume supply of fuel pump too low ♦Fuel injectors fouled Affected terminals - 0-115 page 2 2469 P1127 p1127 Printed in Germany – 1, 2000