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Home >> Mazda >> 2022 >> MX-5 Miata RF Club >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Electric Supply Unit (ESU) >> DTC U3000-44: Electrical Supply Unit (ESU) Internal Malfunction [Electrical Supply Unit (ESU)] >> Diagnostic Procedure

Diagnostic Procedure

DTC U3000:44 (ELECTRICAL SUPPLY UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY IF MALFUNCTIONING LOCATION IS ELECTRICAL SUPPLY UNIT (ESU) DEPENDING ON REPEATABILITY 
Yes Replace the electrical supply unit (ESU), then go to the next step.
(See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION .)
No Go to the next step.
2 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 [ELECTRICAL SUPPLY UNIT (ESU)] .)
No DTC troubleshooting completed.