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Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Diagnosis, Fault Memory (Page GR-D2)

Syncro Canada Engine code PG Digifant fuel and ignition system electrical testing


Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Digifant fuel and ignition system, electrical testing (Page D2-10-1)

Note Look under General for information about the test equipment, how to hook it up and how to use it. To use the information in this manual you need the right wiring diagram. See wiring diagrams.


Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Digifant fuel and ignition system, electrical testing (Page D2-10-2)

use Test box VAG 1598 and adaptor wire kit VW 1594 to make all test connections to the control unit the terminal numbering on the control unit harness connector and the numbering on the VAG 1598 Test box are the same

CAUTION! Do NOT connect or disconnect adaptors/test instruments to the VAG 1598 Test box while the ignition is switched ON.

A - Digifant system, checking Using Digifant control unit harness connector Testing requirements battery voltage OK fuses 15 and 18 OK Digifant system grounds OK fuel pumps OK fuel pump relay OK switch OFF ignition disconnect Digifant control unit (J 169) harness connector located on driver's side of plenum (water trough)


connect VAG 1598 Text box 1 to Digifant control unit harness connector 2 using adaptor cable VAG 1598/2 control unit 3 is NOT connected make connections on the VAG 1598 Test box as indicated in the following procedures


Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Digifant fuel and ignition system, electrical testing (Page D2-10-3)


Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Digifant fuel and ignition system, electrical testing (Page D2-10-4)

Electrical testing with Digifant control unit connected Note Perform the following tests only if the engine will not start. switch OFF ignition

connect VAG 1598 Test box 1 to the Digifant control unit harness connector 2 and to the Digifant control unit 3 using adaptor cable VAG 1598/2

CAUTION! Always switch the multimeter to the desired units and range of measurement (Volts, Ohms, etc.) before making any connections to the Test box or the Digifant control unit will be permanently damaged. Do not connect or disconnect adaptors/test instruments to the VAG 1598 Test box while the ignition is switched ON.


Volkswagen B3 Passat Diagnosis, Fault Memory - Passat Syncro Digifant fuel and ignition system, electrical testing (Page D2-10-5)

switch OFF ignition disconnect multimeter from Test box

connect US 1115 LED tester (VAG 1527B) to terminals 13 and 18 of Test box using adaptor cables from the VW 1594 kit disconnect main harness connector for fuel injectors (from fuel injector wiring guide)

switch OFF ignition

connect US 1115 LED tester (VAG 1527B) to terminals 3 and 25 of Test box using adaptor cables from the VW 1594 kit


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