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Home >> Audi >> 1987 >> 5000 CS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Digital Control System - Turbo & QUATTRO >> Diagnosis & Testing >> Component Testing (Other Devices) >> Boost Pressure Indicator

Boost Pressure Indicator

  1. Start and idle engine. Using a voltmeter, probe back side of ECU connector terminal No. 17. See Figure . If voltage is not .25-2.5 volts, replace ECU.
  2. If okay, check boost pressure gauge. If it does not indicate correct pressure, check wiring between ECU and instrument panel. If wiring okay, replace boost pressure gauge.
NOTE: CIS (LAMBDA) fuel injection maintains constant fuel pressure throughout system. Relieve pressure before opening system. DO NOT  allow fuel to leak on engine or electrical parts. DO NOT allow any open flame near fuel system being serviced.
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