DME 7.8 DME 7.8 0 · Work instruction

DME 7.8 DME 7.8 0 Work instruction Display OK If not OK 8 Check volume supply of ♦Relieve pressure in fuel tank by → End. fuel pump. opening tank cap. (Fuel filter and electrical ♦Connect Porsche System Tester supply OK) 2 ♦Remove complete air filter sys- tem ♦Detach fuel return line (A/F 17 mm) from the engine compart- ment (left), taking care to hold it fast (A/F 17 mm). ♦Collect residual fuel ♦Observe safety regulations ♦Connect fuel hose (shop-made, approx. 1.5 metres long) to the fitting and hold in a measuring container ♦Actuate fuel pump with the Por- sche System Tester 2 and allow fuel to flow into the measuring container for 30 seconds ♦Volume supply must be at least 850 cm3/ 30 s, i.e. after 30 seconds at least 850 cm3 of fuel must be in the measuring container. Note! It is essential to observe safety regulations for handling fuel. Work instruction Display OK If not OK 9 Check triggering of fuel ♦The fuel injectors can be indi- The engine idle Check triggering injectors vidually suppressed with the speed decreases if Step 9a Porsche System Tester 2 in the triggering is OK menu 'Drive link active' 9a B+ supply ♦Remove connector of fuel injec- > 11 V Check wiring tor to be checked Step 9b according to wiring ♦Measure voltage between valve diagram for continu- ity or short circuit plug contact Pin 1 and ground → End ♦Switch on the ignition. 9b Coil resistance of fuel ♦Remove connector of fuel injec- 11 - 13 Ω injectors tor to be checked Step 9c ♦Measure resistance between the terminals of the fuel injec- tor 2470 P0303 0-46 page 5 Printed in Germany – 4, 2002 p0303