Checking charge pressure sender G31 - engine codes ANB, APU, ARK, ATW — AUDI
Checking charge pressure sender G31 - engine codes ANB, APU, ARK, ATW on Audi: factory workshop procedure for engines AEB, AJL, ANB, APU.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Checking
charge pressure sender
G31
- engine codes ANB, APU, ARK, ATW
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526D
Voltage tester
V.A.G 1527B
Auxiliary measuring set
V.A.G 1594C
Adapter cable, 121-pin
V.A.G 1598/31
Vehicle diagnostic, testing and information system
VAS 5051B
Procedure
Note
The
charge pressure sender
G31
and the wiring connections are monitored by the engine control unit.
Vehicle diagnostic, testing and information system
VAS 5051B
connected.
Engine running.
Vehicle self-diagnosis
and vehicle system
“01 - Engine electronics”
selected.
Display on
VAS 5051B
:
From menu
1
, select diagnostic function
“Interrogate fault memory”
and press
→
key to continue.
If a fault relating to
charge pressure sender
G31
is displayed:
Press
←
key to exit function
“Interrogate fault memory”
.
Select
“End output”
.
Switch off ignition.
Unplug electrical connector
arrow
at
charge pressure sender
G31
.
Checking voltage supply
Connect
hand-held multimeter
V.A.G 1526D
to measure voltage between contacts
1
and
3
of electrical connector for
charge pressure sender
G31
.
Switch on ignition.
Specification: approx. 5 V.
If specification is not attained, connect
adapter cable, 121-pin
V.A.G 1598/31
(test box) to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth
Rep. gr.
24
.
Check for open circuit and short to positive or earth in the following wiring for
charge pressure sender
G31
:
Connector
Contact
V.A.G 1598/31
Socket
1
108
3
98
Repair wiring connection if necessary.
Checking signal wire
Connect electrical connector to
charge pressure sender
G31
.
Connect multimeter (voltage measurement range) between socket
“101”
and socket
“108”
of
adapter cable, 121-pin
V.A.G 1598/31
.
Start the engine and run at idling speed.
Specification: approx. 1.90 V.
Increase engine speed by operating throttle quickly.
Specification: 2.00 … 3.00 V.
If specifications are not attained, check for open circuit and short to positive or earth in the following wiring for
charge pressure sender
G31
:
Connector
Contact
V.A.G 1598/31
Socket
4
101
Repair wiring connection if necessary.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.