Diesel Fuel Injection

Safety Precautions

CAUTION!
When doing any repair work, especially in the engine compartment, pay attention to the following due to clearance issues:

• Route lines of all types (e.g. for fuel, hydraulic, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.

• Ensure sufficient clearance to all moving or hot components.

To reduce the risk of personal injury and/or damage to the fuel injection and glow plug system, always observe the following:

• Only disconnect and reconnect wires for glow plug and fuel injection systems, including test leads, when ignition is turned off.

• If engine is to be cranked at starting RPM without starting, e.g. for a compression test, separate the connection for pump-injector unit at cylinder head:

• Obtain radio code for radios with anti-theft coding before disconnecting battery.

• Always switch ignition off before disconnecting or connecting battery, as failure to do so may damage the control module for Diesel-Direct Fuel Injection System.

• Vehicles with an airbag are equipped with an emergency fuel shut-off system. It reduces the risk of fire in an accident because the fuel pump relay switches the fuel pump off.

• When opening the driver door, the fuel pump is activated for 2 seconds to build pressure in the fuel system. This improves comfort of engine start-up behavior.

• Fuel pump is activated with switching on the ignition and by door contact switch of driver's door. Therefore for reasons of safety, connector - arrow - must be disconnected from fuel delivery unit before opening fuel supply system, if the battery is not disconnected.





If special testing equipment is required during road test, note the following:

• Test equipment must always be secured to the rear seat and operated from there by a second person.

If test and measuring instruments are operated from the front passenger's seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered.