- via fuel pump relay without tester
Disconnect the fuel pump relay from the central electrical system and jumper plug-in contacts 30 and 87 (identification 3 and 5 on central
electrical system) with a fused shop-made cable. The fuel pump must now operate or deliver fuel.
4. Nominal test values
Stationary engine 3.8 锟斤拷 0.2 bar
Engine idling 3.3 锟斤拷 0.2 bar
NOTE: The seal or sealing ring in the brass closure cap is not exchangeable. It must therefore be used only once.
Tightening torque of new brass closure cap 2.5 锟斤拷 0.5 Nm.
3 Check volume supply of fuel pump.
Precondition:
Fuel filter and electrical supply OK.
1. Relieve pressure in fuel tank by opening tank cap.
2. Connect Porsche System Tester 2.
3. Remove complete air filter system.
4. Detach fuel return line from the engine compartment, taking care to hold it fast. Collect residual fuel.
5. Connect fuel hose (shop-made, approx. 1.5 m long) to the fitting and hold in a measuring container.
6. Actuate fuel pump with the Porsche System Tester 2 and allow fuel to flow into the measuring container for 30 seconds.
Quantity supplied 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.
4 Fuel injectors fouled.
1. If preceding Check Points were negative, the fuel injectors may be fouled.
2. Clean fuel injectors (ultrasonic cleaning device) or replace them.
Oxygen Sensing Adaptation, Lower Load Range, Bank 2 - Below Limit