SEAT Workshop Service and Repair Manuals

Activating checking Checking conditions l  Injector resistance, OK l  Voltage supply, OK. Test sequence

–  Pull 4-pin connector off ignition transformer -arrow-.

–  Unplug the connectors -arrows- from the injectors.

–  Connect diode test lamp -V.A.G 1527 B- using aux. cables from -V.A.G 1594 A- or -V.A.G 1594 C- to connector contacts.   Note Use test probes -V.A.G 1594 A- or -V.A.G 1594 C- if the vehicle has sealed connectors. –  Briefly operate the starter and check activation of injector. The LED must light-up.   Note The LED -V.A.G 1572 B- does not extinguish completely during the activation of the engine control unit, but remains shining weakly, increasing its intensity a little when activated. If the LED does not light up:

–  Connect test box -V.A.G 1598/22- to control unit wiring harness..

–  Check wiring between test box and 2 pin injector connectors (to engine control unit) for open circuit, according to current flow diagram.

Cyl.	Injector connector, contact	Test box -V.A.G 1598/22-, socket
1	2	79
2	2	59
3	2	73
4	2	65
Specification: 1.5 Ω max.

–  Additionally, check wires for shorts to one another, to vehicle earth or to battery positive.    Specification: ∞ Ω

–  Check the cables between contacts 1 of the injector connectors for breaks.    Wire resistance: max. 1,5 Ω If there is no fault in the wiring and the resistance measurement values are OK.: –  Renew engine control unit: → VAS 5051; Vehicle self-diagnosis