SEAT Workshop Service and Repair Manuals

Test process

–  Remove the camshaft housing cover -arrows-.

–  Detach the 4-contacts connector from the ignition transformer -arrows-.

–  Remove the terminal connectors -arrows- from the injectors.

–  Connect the diode light -V.A.G. 1527- with auxiliary leads of the -V.A.G. 1594- to the contacts of the cylinder 1 connector. –  Switch on the starter motor and test the voltage supply of the cylinder 1 injector. The diode light should light up. –  Repeat the test at the injector connectors corresponding to cylinders 2...4. –  Switch off the ignition. If the diode light does not flash for any cylinder:

–  Connect the diode light to the connector of cylinder 1, contact 1 and earth. The diode light should light up. –  Repeat the test at the injector connectors corresponding to cylinders 2...4. If the diode does not light up: –  Switch off the ignition. –  Test for open circuits in the wiring between double-contact connector 1 and the fuel pump relay -J17-, following the wiring diagram. Wire resistance: 1.5 Ω max. If the diode light does not come on at one or more cylinders:

–  Connect test box -V.A.G. 1598/31- to the wiring harness of the control unit, without connecting the engine control unit.

–  Test for open circuits in the wiring between the test box and the double connector, following the wiring diagram. Injector 1, contact 2+female contact 96 Injector 2, contact 2+female contact 97 Injector 3, contact 2+female contact 88 Injector 4, contact 2+female contact 89 Wire resistance: 1.5 Ω max. –  Also test the wiring for short circuit between wires. Target value: ∞ Ω –  Test for open circuits in the wiring between the contacts 1 of the injector connectors. Wire resistance: 1.5 Ω max.