Fuel Delivery and Air Induction: Description and Operation

Fuel Injection System

CAUTION!
Fuel system is under pressure! Before opening the high pressure components of the fuel injection system, the fuel pressure must be relieved to residual pressure, procedures. Refer to --> [ High Side Fuel Pressure Releasing ] High Side Fuel Pressure Releasing.

• The Engine control Module (ECM) is equipped with On Board Diagnostic (OBD). Before repairs such as fault finding, check the Diagnostic Trouble Code (DTC) memory first, refer to "Guided Function ". Also the vacuum hoses and connections must be checked (unmetered air).

• For the electric components to work properly, a voltage of at least 12.0 volts is required.

• 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.

• The vehicle have a crash fuel shut off. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay.

• At the same time, with this set up, an improvement in the comfort of engine startability is also attained. When the driver side door is opened, the fuel pump is activated for 2 seconds so that pressure builds in the fuel system, observe safety measures. Refer to --> [ Safety Precautions ] Safety Precautions.

• Fuel hoses in engine compartment must only be secured with spring type clips. The use of clamp or screw type clips is not permissible.

• Secure all hose connections using spring type clips appropriate for the model type.

• spring type clip pliers (VAS 5024A) or hose clip pliers (VAS 6362) are recommended for installing spring clamps.

• To conclude work, check DTC memory of the ECM, erase all DTC entries which may have occurred during the tests and repairs. If DTC memory was erased, generate readiness code.

• If the engine only starts briefly and then shuts off again after troubleshooting, repair or checking of the components, it may be that the immobilizer is blocking the ECM. Control module must then be adapted if necessary. Refer to " Guided Functions".