Safety Precautions
Note the following when working on the fuel system:
There is a risk of injury because the fuel is under very high pressure.
- Reduce the fuel pressure down to residual pressure before opening high pressure area of the fuel injection system.
- To reduce remaining residual pressure, place a clean cloth around the connector and carefully loosen connector.
-- Procedures before opening high pressure fuel injection system. Refer to General Information .
To prevent personal injury and damage to the injection and ignition system, observe the following:
- The ignition must be switched off before connecting or disconnecting injection and ignition system wiring or tester cables.
- Only clean engine with ignition switched off.
- If electrical connectors were disconnected and the engine was started, then malfunctions have been stored in the engine control modules. "Generate readiness code" in "Guided Functions", refer to vehicle diagnosis tester.
Danger of causing damage to electrical components when disconnecting the battery.
- Complete the steps for disconnecting the battery.
- Turn off the ignition and disconnect the battery.
-- Disconnect the battery. Refer to [For transmission(s) 02E] Removal and Installation .
Before Opening High Pressure Fuel Injection System
- The injection system is separated into a high-pressure section (maximum approximately 120 bar) and a low-pressure section (approximately 6 bar).
- Before opening high pressure area, fuel pressure must be reduced to a residual pressure of approximately 6 bar. Refer to General Information .
Note the following when working on the cooling system:
Risk of scalding due to hot steam and hot coolant.
- The coolant system is under pressure when the engine is warm.
- Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure in the system.
The vehicle could overheat if the cap is installed incorrectly.
- The cap must engage noticeably when sealing.
If it is necessary to use testing and measuring devices on road tests, observe the following:
Distraction and improperly secured test equipment can lead to accidents.
There is a risk that the passenger airbag could deploy in a collision.
- Operating testing and measuring equipment while driving creates a distraction.
- There is an increased risk of injury due to unsecured testing and measuring equipment.
- Always secure testers on the rear seat with a strap and have a second person on the rear seat to operate them.
Note the following when working on the exhaust system:
Danger of damaging the decoupling element.
- Decoupling element must not be bent more than 10°.
- Do not load decoupling element on cable.
- Do not damage wire mesh at decoupling element.