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 MANUALSMAZDA20103 L4-2.5LREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEW
2010 Mazda 3 L4-2.5L
Initial Inspection and Diagnostic Overview
2010 Mazda 3 L4-2.5LSECTION Initial Inspection and Diagnostic Overview
FOREWORD [MULTIPLEX COMMUNICATION SYSTEM]
- If the CAN system is considered to be the cause of the malfunction based on the repair order form and the malfunctioning symptom, follow the.
- DTCs are also output due to a control module or sensor malfunction, or incorrect power supply. Verify the output DTCs and first inspect the DTCs not shown in DTC Table [Multiplex Communication System].
- If there is an open circuit in the communication lines, it is possible that signal error DTCs may be output in addition to communication error DTCs. Perform Determining Malfunctioning Part (HS-CAN) - Multiplex Communication System, Determining Malfunctioning Part (MS-CAN) - Multiplex Communication System if the communication error and signal error DTCs are output simultaneously.
Troubleshooting Procedure
*1
DTC Table [Multiplex Communication System]
*2
Multiplex Communication System
*3
U0498
*4
Determining Malfunctioning Part (HS-CAN) - Multiplex Communication System / Determining Malfunctioning Part (MS-CAN) - Multiplex Communication System
*5
Scan Tool Testing and Procedures
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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.