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Home >> Mazda >> 2016 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> On-Board Diagnostics - A/T >> DTC U0074-00: Can Communication (Module Communication Error) >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION 
NOTE:
  • Recording can be facilitated using the screen capture of the PC function.
  • Record the freeze frame data/snap shot data.
- Go to the next step.
2 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.
3 VERIFY OTHER RELATED DTCs 
Yes Follow the applicable DTC inspection procedure, then go to the next step.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE .)
No Go to the next step.
4 VERIFY PCM DTC 
Yes DTC U0074:00 or U0302:00 is displayed:
  • CAN communication line can be considered the cause.
    • Repair or replace the wiring harness between PCM and TCM, then go to the next step.

DTC other than U0074:00 and U0302:00 is displayed:
No PCM can be considered the cause.
5 VERIFY SAME DTC IS NOT PRESENT 
Yes Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [SJ6A-EL] .)
No Go to the next step.
6 VERIFY DTC TROUBLESHOOTING COMPLETED 
Yes Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE .)
No DTC troubleshooting completed.