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.
2002 Mazda B2300 StandardFACTORY OEM SERVICE PROCEDURE
Test 9: No Module/Network Communication
WARNING: This page is about a different car, the 2001 Mazda B4000, 2001 Mazda B3000, 2001 Mazda B2500, and 2001 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect NGS tester connector for loose, damaged, or corroded terminals. Repair as necessary and retest system for normal operation. If connector is okay, go to next step.
- Inspect Data Link Connector (DLC) for damage, bent terminals, or corrosion. Repair as necessary and retest system for normal operation. If connector is okay, go to next step.
- Measure voltage between ground and terminal No. 16 (Orange wire) at DLC. See Figure. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Orange wire between instrument panel fuse block and DLC. Retest system for normal operation.
- Measure resistance between ground and DLC connector terminals No. 4 (Black wire) and No. 5 (Black/White wire). If both resistance readings are 5 ohms or less, repair or replace NGS tester. Retest system for normal operation. If any resistance reading is greater than 5 ohms, repair open in Black wire and/or Black/White wire between ground and DLC. Retest system for normal operation.
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.