2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 785

- 055Measuring beaker

- 069Pressure hose(119 589 04 63 00)

Warning!On USA vehicles with code 917 ( PZEV ), the sealing ring of the service valve for the protective cap must be replaced.Test sequence

- Switch off ignition.

- Connect test pressure gauge.

- Engine at idle

Specified value

- Pressure[3.7...4.2] bar

Question

- Is the measurement value OK?

YES

The measurement value is OK.Test prerequisite

- Test pressure gage is connected.

Test sequence

- Run the engine for a short time and switch off again.

- Switch off ignition.

Specified value

- Pressure after 30 minutes:[> 2.5] bar

Question

- Is the measurement value OK?

YES

The measurement value is OK.Further possible causes of fault

- Test delivery of component M3 (Fuel pump).

NO

The measurement value is not OK.Possible cause and remedy

- In the event of slow pressure drop:Check component Y62 (Fuel injectors).

- In the event of rapid pressure drop:Check valve in component M3 (Fuel pump)