LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2002 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Computerized Engine Controls >> Powertrain Control Module >> Ground Circuit Checks
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Ground Circuit Checks

  1. Using an ohmmeter, check ground circuits to Powertrain Control Module (PCM) for continuity to ground. See WIRING DIAGRAMS article to determine PCM ground terminals. See PCM LOCATIONS  table. If continuity is not present, repair open circuit to ground.
  2. Using a voltmeter, touch negative lead to a good ground. Touch positive lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltage reading is more than one volt, check for open circuit, corrosion, or loose connection on ground lead.
scientia non olet · About LEMON Manuals