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Home >> Volvo >> 1993 >> 850 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Electronic Control Unit - Fuel Injection >> Ground Circuit Check
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Ground Circuit Check

  1. Connect ohmmeter between ground and measuring unit terminal No. 20, then between ground and measuring unit terminal No. 29. Ohmmeter should indicate about zero ohms. If about zero ohms is not present, check control unit grounds.
  2. Connect ohmmeter between measuring unit terminal No. 20 and measuring unit terminals No. 8, 12, 14, and 23. Ohmmeter should indicate about zero ohms in all cases. If reading is too high, repeat test using new fuel injection ECU.
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