Ignition Control Unit (Except Vanagon)

Perform SPARK check. If secondary spark is present, ignition control unit is okay. If not, turn ignition off. Disconnect ignition control unit wire harness connector. Turn ignition on. Using a voltmeter, measure voltage between terminal No. 2 (-) and terminal No. 4 (+) of connector. See Fig 1 .
Voltage should be present. If not, ensure continuity exists between terminal No. 2 and ground. Continuity should also exist between terminal No. 4 and ignition coil positive terminal. Repair wiring if necessary. If wiring is okay, replace ignition control unit.

Fig 1: Typical Ignition Control Unit Connector ID (Except Vanagon)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: Vanagon Digifant I Component Schematic

Courtesy of VOLKSWAGEN UNITED STATES, INC.