Audi Workshop Service and Repair Manuals

Checking inlet camshaft control valve 1 -N205-

Special tools and workshop equipment required

t	Hand-held multimeter -V.A.G 1526 C- or -V.A.G 1526 A-

t	Voltage tester -V.A.G 1527 B-

t	Auxiliary measuring set -V.A.G 1594 C- or -V.A.G 1594 A-

t	Adapter cable, 121-pin -V.A.G 1598/31- (test box)

t	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 ← key. –  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 → key repeatedly until the following display appears: Display on -VAS 5051- (example): A -  3rd control element being tested 3 -  Variable valve timing (camshaft adjustment) l  The valve is activated (clicks) intermittently for 1 minute unless the next control element is selected beforehand by touching the → button. –  Press the ← key 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-. l  Specification: 10 ... 18 Ω. If specification is not obtained: –  Renew inlet camshaft control valve 1 -N205-. If specification is obtained: Checking voltage supply l  Fuse for inlet camshaft control valve 1 -N205- OK → Current flow diagrams, Electrical fault finding and Fitting locations. l  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. l  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 → key repeatedly until the following display appears: Display on -VAS 5051- (example): A -  3rd control element being tested 3 -  Variable valve timing (camshaft adjustment) l  The LED should flash. –  Press the ← key to exit from function “03 - Final control diagnosis”. –  Press function “06 - End output”. –  Switch off ignition and unplug 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“.