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Home >> Mazda >> 2023 >> MX-5 Miata Club >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> On-Board Diagnostic - Start Stop Unit >> DTC B13C3-04: LF Control Unit Internal Malfunction [Start Stop Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC B13C3:04 (START STOP UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT LF CONTROL UNIT  Yes Go to the next step.
No Replace the LF control unit, then go to the next step. (See LF CONTROL UNIT REMOVAL/INSTALLATION .)
2 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Replace the start stop unit, then go to the next step. (See START STOP UNIT 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 [START STOP UNIT] .)
No DTC troubleshooting completed.