Powertrain Management: Service and Repair

- The Engine Control Module is equipped with self-diagnosis. Before carrying out repairs and malfunction finding the DTC memory must be checked. Also the vacuum hoses and connections must 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 See Computers and Controls/System Diagnosis
- Components marked with ** can be checked with the final control diagnosis
- For trouble-free operation of the electrical components, a Voltage of at least 11.5 Volts 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 malfunction. Therefore after completing all checks and repairs the DTC memory must be checked and if necessary erased:
Refer to "On Board Diagnostics II". See Computers and Controls/System Diagnosis