Servicing intake manifold flap motor -V157 (engine with code letters AXR) — AUDI

ATD AXR
Testing intake manifold flap motor

Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598/31

Test sequence

Start final control diagnosis and activate intake manifold flap motor -V157=>Page 01-64.
Opening and closing of intake manifold flap should be audible

If intake manifold flap does not function:

Unplug connector -arrow- from intake manifold flap motor.

Checking voltage supply

Test requirement:

Fuses for engine electronics OK.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Connect multimeter (voltage measurement range) as follows:

Connector / Contact · Measure against
2 · Engine earth

Switch on ignition.
Specification: approx. battery voltage

If the specification is not attained:

Test wiring for open circuits and rectify if necessary.

If the specification is obtained:

Testing earth supply

Connect multimeter (voltage measurement range) as follows:

Connector / Contact · Measure against
1 · Battery positive

Specification: approx. battery voltage

If the specification is not attained:

Test wiring for open circuits and rectify if necessary.

If the specification is obtained:

Checking activation

Connect voltage tester V.A.G 1527 B between contacts 3 and 4.
Start final control diagnosis and activate intake manifold flap motor -V157=>Page 01-64.
The LED should flash.

Press the ◂button to exit from function "03 - Final control diagnosis".
Select diagnosis function "06 - End output".
Switch off ignition.

If the LED flashes, but motor -V157 does not activate flap:

Replace intake manifold flap motor -V157.

If the LED does not flash:

Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself.
Connecting test box to engine control unit without protective housing=>Page 23-49.

Connecting test box to engine control unit with protective housing=>Page 23-51.

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

Connector / Contact · Test box V.A.G 1598/31 / Socket
3 · 81
4 · 75

Rectify any open/short circuit as necessary.

If no fault is found:

Replace engine control unit
Removing and installing engine control unit without protective housing=>Page 23-57.
Removing and installing engine control unit with protective housing=>Page 23-60.