[1] Check system 'Charge pressure control'.: Too low boost pressure

[1] Check system 'Charge pressure control'.: Too low boost pressure

Test 1: Inspect charge air system for leaks.

Test 2: Check component B5/1 (Charge pressure sensor).

1. Inspect charge air system for leaks.
Inspect charge air system for leaks.
Important notes

- The following test sequence has changed.
- Follow the test procedure precisely!
- The test must be performed with the engine oil cap removed.
Communication with ECU required

2. Check component B5/1 (Charge pressure sensor).
Check actual value B5/1 (Charge pressure sensor).
Test prerequisite

- Ignition ON
Status of the relevant actual values:
- Boost pressure:Warning! Communication with ECU required.

- Atmospheric pressure:Warning! Communication with ECU required.

- Intake air pressure:Warning! Communication with ECU required.
Specified value

- With the ignition on, the values for boost pressure, atmospheric pressure and intake air pressure must not deviate from one another by more than 30 mbar.
Question

- Are the read-out values OK?


YES
The actual value is okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Loose contact, repair or replace if necessary.In the case of warranty or goodwill operations, see TIPS document in design group 09.40End of test

NO
Voltage supply of component B5/1 (Charge pressure sensor)
Figure legend/figure

- B5/1 (Charge pressure sensor)
- B5/1x1Plug connection B5/1 (Charge pressure sensor)
Test prerequisite

- The actual value is not o.k.
Test prerequisite

- Switch off ignition.
- Detach coupling at component B5/1 (Charge pressure sensor).
- Measure direct voltage with multimeter between sockets (B5/1x1) 1 and (B5/1x1) 3
- Switch on ignition.
Specified value

- Voltage[4,6...5,1V]
Question

- Is the measurement value OK?







YES
Signal cable of component B5/1 (Charge pressure sensor)
Figure legend/figure

- B5/1 (Charge pressure sensor)
Special tools

- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket [1.63] 63 of the 126-pole socket box tester and socket [B5/1x1] 2
Specified value:

- Resistance <1 Ohm?
Question

- Is the measurement value OK?







YES
The measurement value is not OK.Possible cause and remedy

- Replace component B5/1 (Charge pressure sensor).
End of test

NO
The measurement value is OK.Test signal line between components N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Open circuit.End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test lines between components N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Open circuit.


2. No further information available.