Fuel Delivery and Air Induction: Description and Operation

Fuel Injection System

• Fuel hoses in engine compartment may only be secured with spring type clamps appropriate for the model type. The use of clamp or screw type clips is not permissible.

• Hose clip pliers (VAS 6340) or spring type clip pliers (VAS 5024 A) are recommended for installing spring clamps.

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

• Observe safety precautions after connecting battery. .

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

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

• If the engine only starts briefly and then shuts off again after troubleshooting, repairs or checking of the components, it may be that the immobilizer is blocking the Engine Control Module (ECM). ECM must then be adapted if necessary.

• To conclude work, check the Diagnostic Trouble Code (DTC) memory of the ECM, erase all DTC entries which may have occurred during the tests and repairs. If the DTC memory was erased, generate a readiness code. Refer to the "Guided Function" in the vehicle diagnostic tester.

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

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