Ground Circuit Checks
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.