Checking Boost Pressure With Manometer While Test Driving The Car

Checking boost pressure with manometer while test driving the car

Special tools:
999 5230 PRESSURE METER 999 5230 Pressure Meter

Note! In order to ensure that the output of the turbo unit is correct, it is possible to measure the boost pressure.

Caution! Excessive boost pressure can cause serious engine damage.

Connect the measuring equipment




- Remove the turbo control valve from the air cleaner (ACL) housing
- Remove the red marked hose from the turbo control valve.

Note! If it is not possible to pull it away, cut the hose.

- Connect manometer 999 5230 PRESSURE METER 999 5230 Pressure Meter with a T-piece in between.

Note! Route hose with manometer inside the passenger compartment and hang up the manometer vertically.

Warning! Test drive on a quiet road. Drive safely. Abide by local traffic regulations and speed limits while test driving.

Measure the boost pressure




Drive at approx. 1800 r/min in 2nd gear.
Fully depress the accelerator pedal.
Apply the brakes while depressing the accelerator pedal at an engine speed of max. 5500 r/minso that full boost is obtained.
Full boost should be between 1800-5500 r/min.
Important: Do not brake for longer than 5 seconds, otherwise serious damage may be caused to the braking system.
Check the boost pressure and basic boost pressure values at full load.





If the test values differ from the above values, adjust the boost pressure control (BPC) valve see Checking and adjusting the boost pressure control (BPC) valve on the turbocharger (TC) Adjustments

Measure the basic boost pressure




Remove the turbo control valve wiring connector and carry out the same test drive as when measuring boost pressure, see Measure the boost pressure.

Note! These values are the basic values in "limp home" mode.

If no repairs are required then continue with Remove the special tool

Repairs
If the test values differ from the above values, read off the DTCs from the EMS 2000 system.

Note! Fault code ECM-2D will be stored due to the disconnected turbo control valve.

Check the turbocharger inlet and outlet system for leakage, blockage and unusual noises.
Check that compression, sparkplugs, timing, fuel pressure, lambda, CO content, etc are functioning correctly/are correctly adjusted.
Check that the correct fuel octane is used.
If the boost pressure is correct and well adjusted but there is still power dissipation, first try a new EMS 2000 ECU and check the performance again.
If the result is the same, there is an internal fault. Replace the turbo charger.

Remove the special tool




- Remove the measuring equipment and reinstall the hose and the hose clamp
- Connect the connector to the turbo control valve
- Install the turbo control valve to the air cleaner (ACL) housing
- Read off the diagnostic codes and erase all stored codes.

Note! Fault code ECM-2D will be stored because the turbo control valve is disconnected.