Fuel Delivery and Air Induction: Description and Operation

Diesel Fuel Injection

• Engine Control Modules (ECM) are equipped with On-Board Diagnostics (OBD). Always check DTC memory first, before performing repairs or troubleshooting. Vacuum hoses and connections should also be checked (false air).

• For the electric components to work properly, a voltage of at least 11.5 V is required.

• Do not use any silicone sealant. Traces of silicone components which are sucked into the engine are not burned there, and they damage the oxygen sensors.

• The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Modules (ECM) can otherwise be damaged.

• Fuel hoses at engine must only be secured with spring-type clamps. The use of clamping collars or screw clamps is not permitted.

• Vacuum hoses must not be clogged or kinked.

• Spring clip installation tool (VAS5024A) is recommended for installing spring-type clips.





• Components marked with * are tested via On Board Diagnostic (OBD) --> [ Diagnostic Mode 03 - Read DTC Memory ] Reading Diagnostic Trouble Codes, Diagnostic mode 3: Check DTC memory.

• It is possible that the control module will recognize a malfunction and store a DTC during some tests. Therefore the following work steps must be performed in the mentioned sequence after ending all tests and repairs.

- Check DTC memory --> [ Diagnostic Mode 03 - Read DTC Memory ] Reading Diagnostic Trouble Codes,

- Erase DTC memory --> [ Diagnostic Mode 04 - Erase DTC Memory ] Clearing Diagnostic Trouble Codes

- For completion, generate readiness code --> [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.