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Home >> Mazda >> 2023 >> CX-5 Turbo >> Repair and Diagnosis >> Brakes >> Parking Brake System >> On-Board Diagnostic - Electric Parking Brake >> DTC C112A-77: Incorrect Electric Parking Brake Motor Gear Unit Position [Electric Parking Brake Control Module] >> Diagnostic Procedure

Diagnostic Procedure

DTC C112A:77 (ELECTRIC PARKING BRAKE CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 VERIFY OTHER ELECTRIC PARKING BRAKE DTCS 
  • Clear the DTC for the electric parking brake control module using the M-MDS. (See CLEARING DTC [ELECTRIC PARKING BRAKE CONTROL MODULE] .)
  • Perform the following procedure 3 times or more.
    • Pull up the electric parking brake switch to operate the electric parking brake.
    • Press down the electric parking brake switch to release the electric parking brake.
  • Retrieve the electric parking brake control module DTCs using the M-MDS. (See DTC INSPECTION [ELECTRIC PARKING BRAKE CONTROL MODULE] .)
  • Are any DTCs other than DTC C112A:77 displayed?
Yes If a procedure which verifies other DTCs is included in the diagnostic procedure of the displayed DTC: 
  • Go to the next step.

If a procedure which verifies other DTCs is not included in the diagnostic procedure of the displayed DTC: 
No Go to the next step.
2 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Replace the electric parking brake control module, then go to the next step. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION .)
No System is normal. (Explain to the customer that a DTC is displayed by disconnecting the negative battery terminal during electric parking brake operation.)
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 [ELECTRIC PARKING BRAKE CONTROL MODULE] .)
No DTC troubleshooting completed.