Ignition System: Service Precautions

Safety precautions

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


WARNING!
Be alert when working on or near the engine. High ignition secondary voltage can cause serious personal injury and damage vehicle components.
- DO NOT touch or disconnect ignition wiring when the engine is running or being turned at starter speed.
- DO NOT operate the starter if fuel injectors are removed.
- Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control module may be damaged.
- The ignition must be switched off before connecting or disconnecting injection or ignition system wiring or tester cables.
- In order to run the engine at starting speed without actually starting it (e.g. to test compression), disconnect the connectors from the output stages of the ignition coils and from all the fuel injectors. After completing the work, check and erase the DTC memory. If DTC memory was erased generate readiness code.
- The ignition must always be switched off when cleaning the engine.


CAUTION!
Before disconnecting the battery:
- Stop the engine.
- Be sure of proper radio code (for vehicles equipped with coded anti-theft radio)

When connecting and disconnecting electrical test equipment (LED voltage tester, multi meter, etc.):

- Be sure the ignition is switched OFF.
- Use correct adapters from VAG1594 connector test kit