Computers and Control Systems: Service Precautions

WARNING:

DANGER:
- Danger of accident if test and diagnostic equipment (PST2, scan tool, etc.) is operated while driving.
- Always get a second person to operate the test and diagnostic equipment while driving
- Some tests or system checks can affect vehicle handling so make sure to carry out these tests in a cordoned-off area.
- Gasoline is toxic.
- Inhaling vapors can lead to irritation of the mucous membranes and eyes
- It represents a serious risk to health when inhaled, touched or swallowed over extended periods
- Wear a breathing mask with active charcoal filter; do not breathe in any fuel vapors
- Wear protective gloves that are fuel-resistant
- Perform work on the fuel system only in well-ventilated rooms
- Relieve the fuel pressure before opening the fuel lines or fuel hoses
- Collect escaping fuel; absorb it if necessary with a suitable binding material and dispose of properly (special-category waste.)
- Pay attention to cleanliness when working on the fuel system
- Working with gasoline involves a danger of fire and explosion
- Keep away from sources of ignition
- Do not smoke
- Danger of fire due to naked flames and sparks, e.g.during welding or grinding work
- Danger of fire due to escaping fuel, e.g.on hot engine components and/or due to electrostatic charging
- Secure the vehicle, e.g.with a warning sign
- Change any clothing soaked with fuel immediately
- In case of fire, use a CO2 or dry powder fire extinguisher

WARNING:
- Danger of injury by hot and/or rotating parts.
- Do not perform any work on the engine and/or exhaust system when the engine is running and/or hot.
- Danger of injury due to fan start-up. Fans can start up unexpectedly when the ignition is switched on, when control module connector B is disconnected, when the air-conditioning system is switched on or when the engine is warm. Make sure to wear safe, correctly fitting clothes and any necessary personal safety gear (hair net). Do not work in this area when the engine is running.

CAUTION:
Risk of property damage if batteries and plug connectors of the control modules are handled incorrectly.
- Never disconnect the battery terminals with the engine running.
- Never start the engine unless the battery terminals are properly connected.
- Never connect or disconnect the plug connections of the control modules or other electronic components with the ignition switched on.
- Please observe warnings in the Body Manual if you intend to do welding work on vehicles.