SEAT Workshop Service and Repair Manuals

Checking exhaust gas recirculation potentiometer -G212-

Special tools and workshop equipment required

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

t	Voltage tester -V.A.G 1527B-

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

t	Adapter cable, 121-pin -V.A.G 1598/31-

Not illustrated t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with diagnosis cable -V.A.G 1551/3C- t  Current flow diagram Test prerequisites

l  Fuse 29 must be OK. l  The battery voltage must be at least 11.5 V. l  All electrical consumers, e.g. lights and rear window heating, must be switched off. l  If the vehicle is equipped with an air conditioner, it must be switched off. Test procedure

–  Pull 6-pin connector (grey) off exhaust gas recirculation valve -N18--arrow-.

–  Connect hand-held multimeter -V.A.G 1526A- or hand-held multimeter -V.A.G 1526C- for voltage measurement to connector contact 2 (positive) + 4 (ground) using auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. –  Switch on ignition. Specification: at least 4.5 V –  Switch off ignition. If no voltage is present: –  First check whether a coded radio is fitted. If so, obtain anti-theft coding. –  Remove battery.

–  Connect adapter cable, 121-pin -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected. –  Check cables between test box and 6-pin connector for open circuit using current flow diagram. Contact 2 and test box socket 98 Contact 4 and test box socket 108 Contact 6 and test box socket 100

Cable resistance: max. 1.5 Ω. –  Also check wiring for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω. If no cable fault is detected and voltage is present between contacts 2 +4: –  Also connect 121-pin adapter cable -V.A.G 1598/31- to engine control unit and reconnect 6-pin connector to exhaust gas recirculation valve. –  Install battery. –  Connect fault reader -V.A.G 1551- (vehicle system tester -V.A.G 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. –  Connect voltage tester -V.A.G 1527B- to test box socket 100 and earth using auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. The LED must flash –  Proceed with final control diagnosis until completed. –  Press buttons 0 and 6 for function “End output” and confirm entry with Q button. –  Switch off ignition. –  Renew following components, depending on conditions: LED flashes: –  Renew exhaust gas recirculation valve -N18- with exhaust gas recirculation potentiometer -G212- → Item. –  Adapt engine control unit → Rep. Gr.24. If no fault in wiring is detected and the LED does not flash: –  Renew engine control unit → Rep. Gr.24.