LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2003 >> Forester XS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Computerized Engine Controls >> Electronic Control Module (ECM) >> Ground Circuits
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Ground Circuits

  1. Turn ignition off. Using ohmmeter connected to ground, backprobe each ECM ground terminal. For ECM ground terminal identification, see appropriate pin voltage chart in PIN VOLTAGE CHARTS article. 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 more than one volt, check for open, corrosion, or loose connection on ground lead.
scientia non olet · About LEMON Manuals