Fuel Delivery and Air Induction: Description and Operation

General Notes on Injection

Servicing ignition components: Description and Operation

- The engine control module is equipped with On Board Diagnostic (OBD). Before carrying out repairs and fault finding the fault memory of all control modules must be interrogated using the automatic test sequence. This is necessary as various control modules are connected to each other via a data bus. The vacuum hoses and connections must also be checked (unmetered air).
- Fuel hoses in engine compartment must only be secured with spring type clips. The use of clamp or screw type clips is not permissible.
- Disconnecting and connecting the battery must only be done with the ignition switched off, otherwise the engine control module could be damaged.
- Components marked with * are checked via the On Board Diagnostic (OBD), interrogating and erasing fault memory.
- Components marked with ** can be checked with the Output Diagnostic Test Mode.
- 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.
- During some checks it is possible that the control module will recognize and store a fault. Therefore after completing all checks and repairs the fault memory must be interrogated and if necessary erased. interrogating and erasing fault memory.
- Vehicles with an airbag are fitted with a crash/fuel shut-off. It reduces the risk of a vehicle burning in the event of a crash in that the fuel pump is switched off by the fuel pump relay. At the same time this device improves the starting of the engine because as soon as the door is opened the fuel pump is activated to build-up pressure in the fuel system.