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Home >> Mazda >> 2017 >> CX-9 Touring, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Parking Brake System >> On-Board Diagnostic - Electric Parking Brake >> DTC U0402:00 Error Signal Received From TCM >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY TCM DTCs Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)] .)
No Go to the next step.
2 VERIFY IF MALFUNCTIONING LOCATION IS TCM DEPENDING ON REPEATABILITY
  • Clear the DTC for the electric parking brake control module using the M-MDS. (See CLEARING DTC [ELECTRIC PARKING BRAKE] .)
  • 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] .)
  • Is the same DTC displayed?
Yes Replace the TCM, then go to the next step.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6A-EL, GW6AX-EL] .)
No Go to Step 4.
3 VERIFY THAT REPAIRS HAVE BEEN COMPLETED
  • Clear the DTC for the electric parking brake control module using the M-MDS. (See CLEARING DTC [ELECTRIC PARKING BRAKE] .)
  • 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] .)
  • Is the same DTC displayed?
Yes Replace the electric parking brake control module, then go to the next step.
(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION .)
No Go to the next step.
4 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] .)
No DTC troubleshooting completed.