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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 163 (On-Board Diagnostic - Connectivity Master Unit) >> DTC U0028-88; Unit Communication Error (Private-Can) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY IF OTHER DTCs DISPLAYED FOR CONNECTIVITY MASTER UNIT Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
No Go to the next step.
2 PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING LOCATION IS CONNECTIVITY MASTER UNIT Yes Replace the connectivity master unit, 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 the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
No DTC troubleshooting completed.