– Exit diagnosis function.
– Switch off ignition.
If the linkage does not move with the engine idling but the sole-
noid valve operates:
– Pull vacuum hose off charge pressure control vacuum unit.
– Connect hand vacuum pump -V.A.G 1390- to charge pres-
sure control vacuum unit, and check whether linkage is free
to move.
If the linkage is not free to move:
– Turbocharger defective, renew vacuum unit.
If linkage does not move because solenoid valve is not working:
– Check charge pressure control solenoid valve -N75-
⇒ Page 341.
If specification in display zone 4 remains unchanged:
– Check vacuum hoses for leaks. Vacuum hose schematic di-
agram ⇒ Page 334.
Note
After the vacuum hoses have been checked for leaks, the en-
gine must be restarted.
– Check position sender for charge pressure positioner -G581-
⇒ Page 345.
If the charge pressure difference between “OFF” and “ON” in
display zone 3 is not at least 100 mbar:
– Check charge pressure sender -G31- ⇒ Page 343.
– Check charge air system for leaks ⇒ Page 331.
If charge pressure sender -G31- and charge air system are OK:
– Turbocharger defective; renew turbocharger ⇒ Page 326,
Removing and installing turbocharger.
2.3 Connection for vacuum hoses
Engine codes CJDA, CJDD ⇒ Page 335.
Engine codes CPYA, CPYB, CPYC, CPYD, CPYE ⇒ Page 336.
Testing vacuum system ⇒ Page 338
Caution
Do not kink, twist or crush the vacuum lines when routing.
Otherwise the turbocharger may fail.
3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
334
Repair Group 21 - Turbocharging/supercharging
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