Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1988 Audi 5000 CS, StandardFACTORY OEM SERVICE PROCEDURE
Differential Pressure Regulator Electrical System
- Connect Pressure Gauge (VW 1318 ) as previously described. See Figure . Close pressure gauge valve. Disconnect differential pressure regulator connector from side of regulator.
- Using Adapter (1315 A/1 ), connect Multimeter (US 1119 ) to differential pressure regulator and to connector removed from regulator. See Fig 1 .
- Set multimeter to 200 mA DC scale. Turn ignition on. Multimeter should read 100 mA. Pressure gauge should read 17-22 psi (1.2-1.5 kg/cm2 ) less than readings noted in SYSTEM PRESSURE test. If differential pressure is not as specified, check differential pressure regulator wiring and connectors. If wiring and connectors are good, replace differential pressure regulator.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.