Fuel Delivery and Air Induction: Description and Operation

Fuel Injection, General Information


NOTE:
- The Motronic Engine Control Module (ECM) -J220- is equipped with On Board Diagnostic (OBD). Before carrying out repairs and troubleshooting the DTC memory of all control modules must be checked 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 Motronic Engine Control Module (ECM) -J220- could be damaged.
- Components marked with * are checked via the On Board Diagnostic (OBD), Checking and Erasing DTC Memory.
- Components marked with ** can be checked with the Output Diagnostic Test Mode (DTM).
- 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 burned in the engine and damage the oxygen sensor.
- Some checks can cause the control module to recognize and store a DTC. Therefore after completing all checks and repairs the DTC memory must be checked and if necessary erased, Checking and Erasing DTC Memory.
- Vehicles with an airbag are built with a crash/fuel shut-off. It reduces the risk of a vehicle burning in the event of a crash and 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 for 2 seconds to build up pressure in the fuel system.