Fuel Delivery and Air Induction: Description and Operation

Fuel Injection System

• The intake air temperature sensor (G42) is installed on the intake manifold with the manifold absolute pressure sensor (G71).

• If fuel supply system was opened, then the system must be bled before starting the engine. Refer to => [ Fuel System, Filling and Bleeding ] Fuel System, Filling and Bleeding.

• Fuel hoses in the engine compartment may only be secured using spring type clamps, Allocation, refer to the Parts Catalog. The use of clamp or screw type clamps is not permissible.

• The ignition must be turned off when disconnecting the battery. Obtain the radio code for radios with a anti-theft code before disconnecting the battery.

• Observe the safety precautions after connecting the battery.

• For trouble free operation of the electrical components a voltage of at least 11.5 volts is necessary.

• Do not use sealants containing silicone. Particles of silicone drawn into the engine, will not be burnt and will damage the oxygen sensor.

• If the engine only starts briefly and then turns off again after troubleshooting, repairs or checking of the components, it may be that the immobilizer is blocking the Engine Control Module (ECM). The ECM then may have to be adapted. Refer to "Guided Functions" in the vehicle diagnostic tester.

• It is possible that the ECM will recognize a malfunction and store a Diagnostic Trouble Code (DTC) during some tests. After completing all checks and repairs, check the DTC memory and erase the memory, if necessary.

• Vehicles with an airbag are equipped with an emergency fuel shut off system. It reduces the risk of fire in an accident because the fuel pump relay switches the fuel pump off.

• When the drivers side door is opened, the fuel pump is activated for 2 seconds so that pressure builds in the fuel system. This improves engine start up behavior.