Checking inlet camshaft control valve 1 N205: Audi 1.8 (AGU, AJQ, AMK, AMU, …)

Checking
inlet camshaft control valve 1
N205
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526 C
or
V.A.G 1526 A
Voltage tester
V.A.G 1527 B
Auxiliary measuring set
V.A.G 1594 C
or
V.A.G 1594 A
Adapter cable, 121-pin
V.A.G 1598/31
(test box)
Vehicle diagnostic, testing and information system
VAS 5051
Procedure
Connect up
vehicle diagnostic, testing and information system
VAS 5051
with
diagnosis lead
VAS 5051/1
, press
vehicle self-diagnosis
button 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 the display shows a fault relating to
inlet camshaft control valve 1
N205
:
Terminate function
“02 - Interrogate fault memory”
by touching
←
button.
Press function
“06 - End output”
and switch off ignition.
Switch on ignition and select vehicle system
“01 - Engine electronics”
.
Display on
VAS 5051
:
From the menu
1
select the diagnostic function
“03 - Final control diagnosis”
.
Press the
→
button repeatedly until the following display appears:
Display on
VAS 5051
(example):
A
3rd control element being tested
3
Variable valve timing (camshaft adjustment)
The valve is activated (clicks) intermittently for 1 minute unless the next control element is selected beforehand by touching the
→
button.
Press the
←
button to exit from function
“03 - Final control diagnosis”
.
Press function
“06 - End output”
and switch off ignition.
If the valve is not activated (does not click):
Checking internal resistance
Take off engine cover panel
arrows
.
Unplug electrical connector
arrow
at
inlet camshaft control valve 1
N205
.
Connect
hand-held multimeter
V.A.G 1526 C
to measure resistance between contacts on
inlet camshaft control valve 1
N205
.
Specification: 10 ... 18 Ω.
If specification is not obtained:
Renew
inlet camshaft control valve 1
N205
.
If specification is obtained:
Checking voltage supply
Fuse for
inlet camshaft control valve 1
N205
OK
Current flow diagrams, Electrical fault finding and Fitting locations
.
Fuel pump relay
J17
OK
Current flow diagrams, Electrical fault finding and Fitting locations
.
Note
The
inlet camshaft control valve 1
N205
is supplied with power via the
fuel pump relay
J17
.
Connect
voltage tester
V.A.G 1527 B
between contact
1
of connector for
inlet camshaft control valve 1
N205
and engine earth
“–”
.
Operate the starter briefly.
The LED should light up.
If LED does not light up:
Check for open circuit in wiring from contact
1
of connector for
inlet camshaft control valve 1
N205
via fuse to
fuel pump relay
J17
Current flow diagrams, Electrical fault finding and Fitting locations
.
Repair wiring connection if necessary.
If the LED lights up:
Checking activation
Connect
voltage tester
V.A.G 1527 B
between contact
1
and
2
of connector for
inlet camshaft control valve 1
N205
.
Switch on ignition and select vehicle system
“01 - Engine electronics”
.
Repeat function
“03 - Final control diagnosis”
.
Press the
→
button repeatedly until the following display appears:
Display on
VAS 5051
(example):
A
3rd control element being tested
3
Variable valve timing (camshaft adjustment)
The LED should flash.
Press the
←
button to exit from function
“03 - Final control diagnosis”
.
Press function
“06 - End output”
.
Switch off ignition and detach diagnostic connector.
If the LED does not flash or lights up continuously:
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
.
Check for open circuit and short to positive or earth in the following wiring for
inlet camshaft control valve 1
N205
.
Connector
Contact
V.A.G 1598/31
Socket
2
115
Repair wiring connection if necessary.
If no fault is found:
Renew mechanical camshaft adjuster
Chapter
“
Removing and installing camshafts and hydraulic chain tensioner/camshaft adjuster
”
.