Passat (B3)
Servicing Diesel direct injection system
Checking charge pressure control
Special tools, testers, measuring instruments and auxiliary items required
Engine code 1Z, AHU Engine code AFN To enable the charge pressure control to be checked it is essential that the charge pressure is known without charge pressure control (limiting), first => 4-Cyl. Diesel engine, Mechanics; Repair group 21; Check exhaust turbocharger Test sequence
Note: When the charge pressure is measured during a test drive, a second person is required, for reasons of safety, to operate the fault reader.
|
→ Indicated on display: |
|
||
|
→ Indicated on display: |
|
||
|
→ Indicated on display: |
|
||
|
Note: When the charge pressure is measured during a test drive, for reasons of safety, a second person is required to operate the fault reader.
Notes:
|
→ Indicated on display: |
|
||
|
→ Indicated on display: |
|
||
|
→ Indicated on display: |
|
||
Specification on V.A.G 1397/A: 1.700...2.500 bar |
→ Specification on V.A.G 1551: 1700...2500 mbar (in display zone 3) |
|
||
Note: The charge pressure is determined with the turbocharger tester V.A.G 1397/A. The fault reader V.A.G 1551 serves as a check that the charge pressure is being recorded in the control unit. If the specification is not obtained:
|
→ Indicated on display: |
|
||
The solenoid valve must function and the charge pressure control pressure unit rod must move to and fro (at least 3...4 times, as long as there is vacuum in vacuum reservoir).
If the rod does not move:
Electrically checking charge pressure limitation solenoid valve (N75)
|
→ Engine code 1Z, AHU Specification: 25...45 ω |
→ Engine code AFN Specification: 14...20 ω If the specification is not attained:
Checking voltage supply from boost pressure control solenoid valve (N75)
|
If the specification is not attained:
Checking wiring connection to boost pressure control solenoid valve (N75)
The following wiring connections are to be checked for open circuits and/or short to positive or negative. |
|