Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | TDI injection and glow plug system (6-cyl.) | Self diagnosis, V.A.G Inspection Service | Reading measured value block | Readout specifications for charge pressure control | Display group 11 at full throttle (test drive in 3rd and 4th gear, coolant temperature not below +85 °C)

Display group 11 at full throttle (test drive in 3rd and 4th gear, coolant temperature not below +85 °C)

WARNING

Secure fault reader to rear seat and operate from this position. When doing this, always observe the relevant safety precautions → Chapter.

Read measured value block 11

→

▾ Indicated on display

3340 rpm

2121 mbar

42 %

Duty cycle (activation) of charge pressure control solenoid valve -N75-

Current charge pressure

l	If as specified in display zone 2 (tolerance ±100 mbar): okay

l	Charge pressure too low: no charge pressure control ⇒ check

l	Excessive charge pressure: Charge pressure control solenoid valve -N75- sticking

Charge pressure control pressure hose disconnected or clogged
Linkage seized on turbocharger, vacuum unit defective
⇒ Check charge pressure

Charge pressure specified by control unit

l	1900...2200 mbar okay

Engine speed 2900...4000 rpm: OK