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Home >> Subaru >> 1997 >> Impreza Outback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Electronic Control Module (ECM) >> Ground Circuits
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Ground Circuits

  1. Turn ignition off. Using ohmmeter connected to ground, backprobe each ECM ground terminal. See ECM GROUND TERMINAL IDENTIFICATION table. Resistance should be zero ohms. If resistance is not close to zero ohms, repair open to ground.
  2. Start engine. Using voltmeter connected to ground, backprobe each ground terminal. Voltage should be less than one volt. If voltage is greater than one volt, check for open, corrosion, or loose connection on ground lead.
ECM GROUND TERMINAL IDENTIFICATION

Application/Terminal No. Wire Color
17 (1)
18 (1)
19 (1)
20 (1)
42 (1)
46 (1)
69 (1)
94 (1)
95 (1)
(1) See appropriate wiring diagrams in WIRING DIAGRAMS article.
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