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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (On-Board Diagnostics - Dynamic Stability Control System (DSC)) >> DTC U0301-00: Brake Disc Temperature Too High [DSC HU/Cm] >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
Step Inspection Results Action
1 INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .)
If the CAN communication is normal, replace the PCM and perform the repair completion verification.
(See PCM REMOVAL/INSTALLATION (VIN L) .)
(See PCM REMOVAL/INSTALLATION (VIN M) .)
 
No System is normal. (Explain to the customer that a DTC was displayed by an increase in the brake disc temperature due to the use of frequent braking or continuous operation of the Mazda Radar Cruise Control (MRCC).)
Perform the repair completion verification.
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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