Ground Circuits
WARNING: This page is about a different car, the 2003 Mazda Tribute, 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Locate Powertrain Control Module (PCM). See POWERTRAIN CONTROL MODULE LOCATION
table. Disconnect PCM 104-pin harness connector. Using a DVOM, check continuity between ground and PCM connector terminals. See IDENTIFYING PCM GROUND TERMINALS
table. See Figure
-Figure
. If continuity is present, go to next step. If continuity is not present, repair open ground circuit as necessary.POWERTRAIN CONTROL MODULE LOCATION
Application Location All Models Center Of Engine Compartment, Mounted In Firewall IDENTIFYING PCM GROUND TERMINALSApplication PCM Ground Pin No. Except Tribute 24, 25, 51, 76, 77 & 103 Tribute 2.0L 23, 24, 25, 33, 51, 76, 77 & 103 3.0L 3, 24, 25, 51, 76 & 103 - Connect DVOM negative lead to a good ground. With vehicle running, backprobe DVOM positive lead to each PCM ground terminal. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.