Safety Precautions
If special testing equipment is required during road test, note the following:
Improperly secured testing and measuring equipment and distraction during a road test increase the risk of an accident.
Risk of passenger airbag deploying in an accident.
- Operating testing and measuring equipment while driving creates a distraction.
- There is an increased risk of injury due to unsecured testing and measuring equipment.
- Position passenger's seat as far back as possible.
- Only use the Vehicle Diagnosis and Service System VAS 5052 or Diagnostic System VAS 5053.
- Testing and measuring instruments -1- must lay flat on the passenger's thighs and be operated by him or her, as shown in the illustration.
Fuel system is under pressure! Fuel pressure must be reduced to a residual pressure before opening high pressure area of injection system. Refer to BEFORE OPENING HIGH PRESSURE FUEL INJECTION SYSTEM .
After reducing high pressure, connection should be opened immediately. To do this, place a cloth around the connection to reduce residual pressure (approximately 6 bar).
To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:
- The battery must be disconnected before opening the fuel system, for safety reasons. The fuel pump may be activated by the driver's door contact switch.
- Individuals with a pacemaker must not stay in the danger area of high voltage systems, e.g. ignition systems, xenon light.
- Fuel lines must not be opened when engine is running.
- Only disconnect and reconnect wires for injection and ignition system, including test leads, when ignition is switched off.
- If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect connectors from ignition coils and remove fuse for electric fuel pump.
- It is possible that the control module will recognize a malfunction and store a DTC during some tests. Therefore after completing all checks and repairs the DTC memory must be checked and if necessary erased.
- If the DTC memory was erased, the readiness code must be generated.
- Cleaning the engine should only be performed with ignition switched off.
- The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module can otherwise be damaged.
- If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect the four connectors for ignition coils, using the ignition coil puller T40039. Refer to IGNITION COILS WITH POWER OUTPUT STAGES . Also remove fuse from Fuel Pump (FP) Control Module -J538-.
The fuse is located in the fuse holder in the right of the luggage compartment.
By removing fuse -SF 6-, the voltage supply to terminal 30 for the Fuel Pump (FP) Control Module -J538- is interrupted.