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Home >> Mazda >> 2022 >> 3 Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> On-Board Diagnostics - Electronically Controlled Brake Unit (4 Of 4) >> DTC U0300-51: Internal Control Module Software Incompatibility [Electronically Controlled Brake Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC U0300:51 (ELECTRONICALLY CONTROLLED BRAKE UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY 
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Perform the DTC inspection for the electronically controlled brake unit. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 Yes Replace the electronically controlled brake unit and perform the repair completion verification.
(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.] .)
(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D. (US)] .)
No Go to the next step.
Repair completion verification VERIFY IF OTHER DTCs DISPLAYED 
  • Perform the DTC inspection. (See DTC INSPECTION .)
  • Are any DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
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