Safety precautions when working on ignition system

To prevent injuries to persons and/or damage to the injection and ignition system, the following must be observed:

• Do not touch or disconnect ignition cables when the engine is running or being turned at starter speed.
• Switch off ignition before connecting or disconnecting injection and ignition system wiring as well as test instrument cables.

Note the following if testers and measuring instruments have to be used during a road test:

• Test and measuring instruments must always be secured to rear seat and operated by a second person from this location.

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

• If the engine is to be turned at starter speed without starting:

• Pull all 4-pin connectors -arrows- off ignition coils with final output stage. ⇒ 1.2 Removing and installing ignition coils with output stage
• Remove fuse for fuel pump control unit - J538- from fuse holder. Fuse assignment ⇒ Current flow diagrams, Electrical fault finding and Fitting locations