Differential Pressure Regulator Electrical System

1. Connect Pressure Gauge (VW 1318) as described previously in SYSTEM PRESSURE. See Figure . Close pressure gauge valve. Disconnect differential pressure regulator harness connector.
2. Using Adapter (VW 1315 A/1), connect Multimeter (US 1119) to differential pressure regulator and harness connector. See Fig 1 . Set multimeter to 200-mA DC scale. Turn ignition on.
3. Multimeter should read 100 mA. Pressure gauge should read 67-80 psi (5.5-5.9 kg/cm² ). If pressure is not as specified, check differential pressure regulator wiring and connectors. If wiring and connectors are good, replace differential pressure regulator.

Fig 1: Attaching Multimeter to Differential Pressure Regulator

Courtesy of AUDI OF AMERICA, INC.