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 (2.0 锟斤拷 0.5 ftlb.).
3 Check fuel pressure regulator, vacuum connection and fuel return line.
1. Remove vacuum hose from fuel pressure regulator.
2. Connect special tool 9103/2 to vacuum hose.
3. Start the engine.
Display: 0.4 - 0.6 bar
If the value is not attained, check the intake air system for leaks and check vacuum line to fuel pressure regulator for restrictions.
4. Check housing of fuel pressure regulator for damage and deformation.
Replace the fuel pressure regulator if it is damaged with the result that the spring pre-tensioning is increased.
4 Check EVAP canister purge valve.
1. Disconnect hose from EVAP canister purge valve to intake system at EVAP canister purge valve.
2. Remove connector of EVAP canister purge valve.
3. Connect special tool 9160/1 to EVAP canister purge valve.
4. Generate vacuum of approx. 0.7 bar.
The vacuum must not fall below 0.5 bar after 10 minutes.
Oxygen Sensing Error By Means of Short Test, Bank 2 - Above Limit
P1134
Oxygen Sensing Error by means of Short Test, Bank 2 - Above Limit
Function
The adaptive oxygen sensing system corrects longer lasting deviations in the fuel/air mixture from lambda = 1 by changing the anticipatory control
calculated in the DME control module and the injection timing altered as a result. Should the correction factor through adaptation exceed a
predetermined value, the diagnosis will detect the adaptation threshold.
Diagnosis conditions
- Mixture adaptation performed with the Porsche System Tester 2
P1127 - P1134
NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation -> Check exhaust system for leaks.