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Home >> Mazda >> 2014 >> 3 SV, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (On-Board Diagnostic - Automatic Transaxle) >> DTC U0074: 00 Can System Communication Error (Local Can Between TCM And Pcm) >> Diagnostic Procedure

Diagnostic Procedure

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DTC U0074:00 (FW6A-EL) - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 VERIFY PCM DTC 
 Yes DTC U0074:00 is displayed:
  • CAN communication line can be considered the cause.
    • Refer to the wiring diagram and verify whether or not there is a common connector between TCM and PCM.

      If there is a common connector: 

      • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a malfunction.
      • Repair or replace the malfunctioning part.

      If there is no common connector: 

      • Repair or replace the wiring harness.
  • Go to the next step.

DTC other than U0074:00 is displayed:
No Go to the next step.
3 VERIFY DTC TROUBLESHOOTING COMPLETED 
 Yes Replace the control valve body, then go to the next step.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION .)
No Go to the next step.
4 VERIFY NO DTC IS PRESENT 
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE .)
No DTC troubleshooting completed.
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