16DB00

The negative control deviation during boost pressure control is too high.


Possible cause:

- Y77/1 (Charge pressure positioner)
- Charge air system
Affected functions:

- Power generation

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Test 1: Inspect charge air system for leaks.

Test 2: Check component Y77/1 (Charge pressure positioner).

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 Y77/1 (Charge pressure positioner).
Figure legend

- Y77/1 (Charge pressure positioner)
- Y77/1x1Plug connection Y77/1 (Charge pressure positioner)
Procedure

- Check component Y77/1 (Charge pressure positioner) for unobstructed movement by actuation.
Proceed to 'Actuation' with F2







Actuation of component Y77/1 (Charge pressure positioner)
Figure legend

- Y77/1 (Charge pressure positioner)
- Y77/1x1Plug connection Y77/1 (Charge pressure positioner)
Test prerequisite

- Engine at idle
- All electrical accessories must be switched off.
Test sequence

- The entire linkage from component Y77/1 (Charge pressure positioner) to the turbocharger must move visibly during the actuation.
Important note

- Never actuate turbocharger adjusting mechanism by hand.
Proceed to 'Actuation' with F2







Warning!Communication with ECU required.