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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Connectivity Master Unit >> DTC U0028-88: Unit Communication Error (Local-Can) (Connectivity Master Unit) >> Diagnostic Procedure

Diagnostic Procedure

DTC U0028:88 (CONNECTIVITY MASTER UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY IF OTHER DTCs DISPLAYED FOR CONNECTIVITY MASTER UNIT (CMU)
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC U0184:00/U0187:00 [CONNECTIVITY MASTER UNIT] .)
No Go to the next step.
2 VERIFY IF MALFUNCTIONING LOCATION IS CONNECTIVITY MASTER UNIT (CMU) DEPENDING ON REPEATABILITY
Yes Replace the connectivity master unit (CMU), then go to the next step.
(See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .)
No Go to the next step.
3 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
No DTC troubleshooting completed.