Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Mazda B2300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Ground Circuits
- 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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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