Checking exhaust gas recirculation potentiometer G212: VW 1.6 (AEH, AKL, APF, AVU)

Checking
exhaust gas recirculation potentiometer
G212
Special tools and workshop equipment required
Adapter cable, 121-pin
V.A.G 1598/31
Voltage tester
V.A.G 1527B
Fault reader
V.A.G 1551
or
vehicle system tester
V.A.G 1552
Diagnostic cable
V.A.G 1551/3C
Auxiliary measuring set
V.A.G 1594A
Hand multimeter
V.A.G 1526B
Current flow diagram
Test prerequisites
All fuses must be OK.
Test procedure
Pull 6-pin connector
1
(grey) off
exhaust gas recirculation valve
N18
.
Connect
hand multimeter
V.A.G 1526B
to 6-pin connector contacts 2 and 4.
Switch on ignition. Specification: at least. 4.5 V.
If the specification is not attained:
Switch off ignition.
Connect
121-pin adapter cable
V.A.G 1598/31
to control unit wiring harness. The engine control unit remains disconnected.
Check wiring between test box and 6-pin connector for open circuit referring to current flow diagram. Contact 2 and test box socket 96, contact 4 and test box socket 84, contact 6 and test box socket 108, wire resistance:: max. 1.5 Ω.
Additionally check wiring for short circuit to one another and short circuit to positive or earth.
If the specification is obtained:
Connect
121-pin adapter cable
V.A.G 1598/31
to engine control unit and reconnect 6-pin connector to
exhaust gas recirculation valve
N18
.
Connect
fault reader
V.A.G 1551
or
vehicle system tester
1552
. Then switch on ignition and select engine control unit with
“Address word 01”
Rep. Gr.
01
.
Initiate final control diagnosis and select
exhaust gas recirculation valve
N18
Rep. Gr.
01
Final control diagnosis
.
Connect
voltage tester
V.A.G 1527B
to test box socket 108 and earth using auxiliary cables from
auxiliary measuring set
V.A.G 1594A
or
auxiliary measuring set
V.A.G 1594C
. The
voltage tester
V.A.G 1527B
must flash.
Proceed with final control diagnosis until completed.
Press buttons
0
and
6
for function
“End data transfer”
and confirm entry with
Q
button.
Switch off ignition.
Renew following components, depending on prerequisite:
Voltage tester
V.A.G 1527B
flashes:
Renew
exhaust gas recirculation valve
N18
with
exhaust gas recirculation potentiometer
G212
.
Adapt engine control unit
Rep. Gr.
24
.
If no fault is detected in lines/wiring and the
voltage tester
V.A.G 1527B
does not flash:
Renew engine control unit
Rep. Gr.
24
.