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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (On-Board Diagnostics - Automatic Transaxle System (ET6A-El, ET6AX-El)) >> DTC P1738-00: Automatic Transaxle Internal Malfunction (TCM) (Us) >> Diagnostic Procedure

Diagnostic Procedure

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DTC P1738:00 (TCM, ET6A-EL, ET6AX-EL, US) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 VERIFY DTC OUTPUT STATUS
  • Are any the following DTCs displayed?
    • P0729:00, P0731:00, P0732:00, P0733:00, P0734:00, P0735:00, P0736:00
Yes Replace the automatic transaxle.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6A-EL (SKYACTIV-G 2.0, SKYACTIV-G 2.5) (US)] .)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6AX-EL (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (US))] .)
No Go to the next step.
2 INSPECT ATF LEVEL
Yes Adjust the ATF level to the specification, then go to the next step.
(See AUTOMATIC TRANSAXLE FLUID (ATF) ADJUSTMENT [ET6A-EL, ET6AX-EL (US)] .)
No Go to Step 5.
3 PERFORM ON-BOARD DIAGNOSTIC TEST TO SPECIFY MALFUNCTIONING PART
Yes DTC P1738:00 is displayed:

DTC other than P1738:00 is displayed:
No Go to the next step.
4 DRIVE VEHICLE AND VERIFY DTCs
  • Drive the vehicle for 5 min or more.
  • Stop the engine.
  • Drive the vehicle for 5 min or more after the engine restarts.
  • Perform the DTC inspection using the M-MDS. (See DTC INSPECTION .)
  • Are any DTCs present?
Yes DTC P1738:00 is displayed:

DTC other than P1738:00 is displayed:
No No DTCs are displayed:
  • DTC troubleshooting completed.
5 PERFORM ON-BOARD DIAGNOSTIC TEST TO SPECIFY MALFUNCTIONING PART
Yes DTC P1738:00 is displayed:

DTC other than P1738:00 is displayed:
No Go to the next step.
6 DRIVE VEHICLE AND VERIFY DTCs
  • Drive the vehicle for 5 min or more.
  • Stop the engine.
  • Drive the vehicle for 5 min or more after the engine restarts.
  • Perform the DTC inspection using the M-MDS. (See DTC INSPECTION .)
  • Are any DTCs present?
Yes DTC P1738:00 is displayed:

DTC other than P1738:00 is displayed:
No Replace the control valve body.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL (US)] .)