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Home >> Audi >> 1994 >> 90 CS Quattro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR) >> EGR Control Solenoid Valve
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EGR Control Solenoid Valve

  1. Disconnect harness connector from EGR control solenoid valve. See the ELECTRICAL COMPONENT LOCATIONS  table at beginning of article. Measure resistance across EGR control solenoid valve terminals. If resistance is not 25-35 ohms, replace EGR control solenoid valve.
  2. If resistance is 25-35 ohms, connect LED Tester (US 1115) between engine ground and EGR control solenoid valve connector terminal No. 1 with jumper from Adaptor Kit (VW 1594). See Figure . Operate starter for several seconds. If LED does not come on, check circuit breaker, wiring and fuel pump relay.
  3. If LED comes on, connect LED tester between EGR control solenoid valve connector terminals with jumper from adaptor kit. In self-diagnostics mode, initiate Output Diagnostic Test Mode (Output DTM). LED tester should flash when Output DTM is initiated for EGR control solenoid valve.
  4. If LED flashes as specified, system is okay. If LED does not flash as specified, check wiring harness. If wiring harness is okay, replace ECM.
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