Checking charge pressure sender G31 - vehicles with electronic throttle — AUDI

Checking
charge pressure sender
G31
- vehicles with electronic throttle
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526 C
or
V.A.G 1526 A
Auxiliary measuring set
V.A.G 1594 C
or
V.A.G 1594 A
Adapter cable
V.A.G 1598/31
(test box)
Vehicle diagnostic, testing and information system
VAS 5051
with
diagnosis lead
VAS 5051/1
Procedure
Note
The
charge pressure sender
G31
and the wiring connections are monitored by the engine control unit.
Connect up
vehicle diagnostic, testing and information system
VAS 5051
with
diagnosis lead
VAS 5051/1
, press
vehicle self-diagnosis
key and select vehicle system
“01 - Engine electronics”
. When doing this, the engine must be running at idling speed.
Display on
VAS 5051
:
From list
1
, select diagnosis function
“02 - Interrogate fault memory”
.
If a fault relating to
charge pressure sender
G31
is displayed:
Terminate function
“02 - Interrogate fault memory”
by touching
←
key.
Press function
“06 - End output”
.
Switch off ignition and detach diagnostic connector.
Vehicles up to model year 2000:
Release catch
1
at turn signal housing with cross-head screwdriver
2
by turning
1
/
4
turn to left.
Reach through opening for turn signal and unplug connector at
charge pressure sender
G31
.
Vehicles from model year 2001 onwards:
Remove washer fluid reservoir
Rep. Gr.
94
.
Unplug electrical connector at
charge pressure sender
G31
.
Checking voltage supply
Connect
hand-held multimeter
V.A.G 1526 C
to measure voltage between contacts
1
and
3
of connector for
charge pressure sender
G31
.
Switch on ignition.
Specification: approx. 5 V
If specification is not obtained:
Connect
adapter cable
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
arrow
Rep. Gr.
24
.
Caution
To prevent damage to electronic components, select appropriate measuring range before connecting measuring leads and observe test requirements.
Check for open circuit and short to positive or earth in the following wiring:
Connector
Contact
V.A.G 1598/31
Socket
1
108
3
98
Repair wiring connection if necessary.
If the specification is obtained:
Checking signal wire
Plug in connector at
charge pressure sender
G31
.
Connect
hand-held multimeter
V.A.G 1526 C
(voltage measurement range) between sockets
“101”
and
“108”
on
V.A.G 1598/31
.
Start engine and run at idling speed.
Specification: approx. 1.90 V
Increase engine speed by depressing accelerator pedal briefly.
Specification: 2.00 ... 3.00 V
If the specifications are not obtained:
Check for open circuit and short to positive or earth in the following wiring:
Connector
Contact
V.A.G 1598/31
Socket
4
101
Repair wiring connection if necessary.
If wiring is OK:
Renew
charge pressure sender
G31
.
Assembling
Installation is carried out in the reverse order; note the following:
Vehicles from model year 2001 onwards:
Install washer fluid reservoir
Rep. Gr.
94
.