Fuel Delivery and Air Induction: Description and Operation

OBD General Information

• Fuel hoses in the engine compartment may only be secured with spring type clamps appropriate for the model type. 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 an anti-theft code before disconnecting the battery.

• Follow all steps after reconnecting 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 in the engine 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 must then be adapted if necessary.

• To complete the procedure, check the ECM Diagnostic Trouble Code (DTC) memory and erase any DTCs that may have been stored when testing and making repairs. If the DTC memory was erased, the readiness code must be generated again. Refer to "Guided Fault Finding" in the vehicle diagnostic tester.

• Vehicles with an airbag are equipped with an emergency fuel shut off system. It reduces the risk of fire in a collision 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 comfort of engine start-up behavior.