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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (On-Board Diagnostic - Automatic Transmission) >> DTC U0074; Can System Communication Error (Between TCM And Pcm) >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
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:
  • Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
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 [FW6A-EL] .)
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 [TCM (FW6A-EL)] .)
No DTC troubleshooting completed.
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