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.
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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESTROUBLESHOOTING (COMMUNICATION CONTROL SYSTEM)
2006 Mazda B4000 Base, Automatic
Troubleshooting (Communication Control System)
2006 Mazda B4000 Base, AutomaticSECTION Troubleshooting (Communication Control System)
- Module Controlled Functions
- Smart Junction Box (SJB)
- Symptom Troubleshooting Chart - Smart Junction Box (SJB)
- Connector End Views - Smart Junction Box (SJB)
- Pinpoint Test 1: No Communication With The Smart Junction Box (SJB)
- Communications Network
- Smart Junction Box (SJB)
- Powertrain Control Module (PCM)
- Restraints Control Module (RCM)
- Instrument Cluster
- Anti-Lock Brake System (ABS) Module
- Four-Wheel Drive (4WD) Control Module
- Notes
- Principles of Operation
- Controller Area Network (CAN)
- Standard Corporate Protocol (SCP) Communications Network
- International Standards Organization (ISO) 9141 Communications Network
- Inspection and Verification
- Pinpoint Test Pc: Data Link Diagnostics Test
- Symptom Troubleshooting Chart - Communications Network
- Connector End Views - Control Systems
- Pinpoint Test 1: Smart Junction Box (SJB) Does Not Respond To The Diagnostic Tool
- Pinpoint Test 2: Restraints Control Module (RCM) Does Not Respond To The Diagnostic Tool
- Pinpoint Test 3: Anti-Lock Brake System (Abs) Module Does Not Respond To The Diagnostic Tool
- Pinpoint Test 4: Four-Wheel Drive (4WD) Control Module Does Not Respond To The Diagnostic Tool
- Pinpoint Test 5: No Controller Area Network (Can) Communication
- Pinpoint Test 6: No Standard Corporate Protocol (SCP) Communications Network Communication
- Pinpoint Test 7: No International Standards Organization (ISO) 9141 Communications Network Communication
- Pinpoint Test 8: No Module/Network Communication - No Power To The Diagnostic Tool
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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.