Testing intake manifold pressure sender -G71 and altitude sender -F96 — AUDI

Intake manifold pressure sender -G71 is located in the Diesel direct injection system control unit.
In Version 1 of the diesel direct injection system1), altitude sender -F96 is a separate component. Fitting location=>Page
23-3
.
In Version 2 of the diesel direct injection system1), altitude sender -F96 is located in the Diesel direct injection system control unit.

1)
Differences between injection systems=>Page
01-1
.

Special tools, testers and auxiliary items

Turbocharger tester V.A.G 1397 A
Hand-held multimeter V.A.G 1526 or V.A.G 1526 A
Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/1
Adapter set V.A.G 1594 A
Test box V.A.G 1598/18

Test requirement:

Engine not running

Connect fault reader V.A.G 1551 and select engine electronics control unit => Page
01-3
.
Read measured value block 10
⇒
0 mg/H
1027 mbar
1013 mbar
0.0 %
Read measured value block, Display Group 010, engine not running=>Page
01-83
.
Observe the readouts in display zone 2 (altitude sender -F96) and display zone 3 (intake manifold pressure sender -G71).
Specification: The pressures should be the same.
Tolerance:±30 mbar

If the specification is not attained:

Compare displayed pressures with pressure according to a barometer (e.g. turbocharger tester V.A.G 1397/A).
Tolerance:±30 mbar.

If the value in display zone 3 does not agree:

Detach pressure hose from control unit.

If the value in display zone 3 still does not agree:

Fit a new Diesel direct injection system control unit -J248
=>Page
23-45
.

If the value in display zone 2 does not agree and a value of 1024 mbar is displayed constantly:

Injection system Version 11):

Test wiring for open circuit and short to positive or earth.

Injection system Version 21):

Fit a new Diesel direct injection system control unit -J248
=>Page
23-45
.

1)
Differences between injection systems=>Page
01-1
.

Testing wiring

Switch off ignition.
Unplug connector for altitude sender -F96
=>Fitting locations overview, Page
23-3
.
Select voltage measurement range (20 V direct current) on hand-held multimeter V.A.G 1526 and connect it to contacts 1 and 2 of the connector using test leads from V.A.G 1594 A.
Switch on ignition.
Specification: approx. 5 V

If the specification is not attained:

With the ignition switched off, connect test box V.A.G 1598/18 to connector for engine control unit=>Page
23-49
.

Test for open circuit and short to positive or earth in the following wiring connections:

Connector / for -F96 / Contact · Test box / V.A.G 1598/18 / / Socket
1 · 41
2 · 33
3 · 40

Test all wires for short circuit to each other.
Rectify any open/short circuit as necessary.

If the wiring is OK:

Injection system Version 11):

Fit a new altitude sender -F96.

Injection system Version 21):

Fit a new Diesel direct injection system control unit -J248
=>Page
23-45
.

1)
Differences between injection systems=>Page
01-1
.