SEAT Workshop Service and Repair Manuals

Checking fuel pump

Special tools and workshop equipment required

t	Union nut tool -3217-

t	K-Jetronic pressure tester -V.A.G 1318-

t	Adapter set -V.A.G 1318/10-12-

t	Adapter -V.A.G 1318/11-

t	Hose adapter -V.A.G 1318/16-

t	Torque wrench -V.A.G 1332- (40...200 Nm)

t	Quantity comparison tester -V.A.G 1348-

t	Relay controlled current circuit tester -V.A.G 1466A-

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	Multimeter -V.A.G 1715-

t	Spring-type clip pliers -VAS 5024A-

Not illustrated t  Measuring container t  Current flow diagram Test prerequisites l  Fuse 14 must be OK.

Fuse holder in vehicles with engine code AJH.

Fuse holder in vehicles with engine code AWC. 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.   Note! Observe the functional description of crash fuel shut-off for vehicles with engine code AWC → Chapter. Checking function and voltage supply   Note! Before carrying out further work, battery earth strap may have to be disconnected. First check whether a coded radio is fitted. Obtain radio code first if necessary. –  Remove cover from fuel delivery unit. –  Briefly operate starter. Fuel pump must be heard to run. –  Switch off ignition. If the fuel pump does not run: Vehicles with engine code AJH

–  Disconnect 6-pin connector -arrow- on left behind battery.

–  Connect remote control for V.A.G 1348 -V.A.G 1348/3A- to contact 2 of connector and battery positive (+) using adapter cable -V.A.G 1348/3-2- and auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. Vehicles with engine code AWC

–  Pull 2-pin connector off cylinder 1 injector -arrow-.

–  Connect remote control for V.A.G 1348 -V.A.G 1348/3A- to contact 1 of connector and battery positive (+) using adapter cable -V.A.G 1348/3-2- and auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. Continuation for all vehicles –  Operate remote control for V.A.G 1348 -V.A.G 1348/3A-. Fuel pump runs: –  Check activation of fuel pump relay -J17- against current flow diagram with checking system -V.A.G 1466A- → Current flow diagrams, Electrical fault finding and Fitting locations. Fuel pump does not run: –  Pull 4-pin connector off fuel delivery unit flange.

–  Connect voltage tester -V.A.G 1527B- to outer contacts of connector using auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. –  Operate remote control. LED must light up. If LED does not light up –  Locate and eliminate open circuit referring to current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations. If LED lights up (voltage supply OK): –  Unscrew union nut with union nut tool -3217-. –  Check that electrical wires between flange and fuel pump are connected. If no open circuit can be found –  Fuel pump defective. Renew fuel delivery unit → Chapter, Removing and installing fuel delivery unit.