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.
2010 Mazda 5 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Body Control Systems: Testing and Inspection
MULTIPLEX COMMUNICATION SYSTEM [MULTIPLEX COMMUNICATION SYSTEM]
Outline
- If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using the M-MDS to determine the malfunctioning system.
- PCM
- TCM (ATX)
- EHPAS control module
- ABS HU/CM (with ABS)
- DSC HU/CM (with DSC)
- Instrument cluster
- Information display
- HF/TEL unit (with HF/TEL system)
- Climate control unit (with full-auto air conditioner)
- Audio unit (base unit) (with audio unit)
- Car-navigation unit (with car-navigation unit)
- BCM
Flowchart
- Use the following flowchart to verify the cause of the trouble.
Step 1-Step 6:
Step 7:
Step 8-Step 13:
Step 14:
Step 15:
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.