Fuel Delivery and Air Induction: Service and Repair

Fuel Injection System, Servicing

NOTE:
- Fuel hoses in engine compartment must be secured with spring type clips. The use of clamp or screw type clips is not permissible.
- The control module for the fuel injection and ignition system is equipped with a Diagnostic Trouble Code (DTC) memory. Before carrying out repairs, adjustment work and troubleshooting the DTC memory must be checked and the vacuum connections checked.
- Components marked with an asterisk (*) are checked via the On Board Diagnostic (OBD) program.
- Components marked with two asterisks (**) are checked via the output Diagnostic Test Mode (DTM).
- For trouble-free operation of the electrical components, a voltage of at least 11.5 volts is necessary.
- Do not use sealants containing silicone. Traces of silicone drawn into the engine are not consumed and will damage the oxygen sensor.
- Do not spray anything in the area of the oxygen sensor connectors. To function correctly, oxygen sensors require reference air, which they receive via the connector If contact spray gets into the oxygen sensor via this path it will lead to damage/malfunctions.
- During some checks it can happen that the ECM will recognize and store a malfunction. Therefore after completing all checks and repairs the DTC memory must be checked and if necessary erased: Scan Tool Function 02.