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2008 - MX-5 - Transmission/Transaxle

NO.23 TRANSMISSION OVERHEATS [SJ6A-EL]



23

Transmission overheats

DESCRIPTION

  • Burnt smell emitted from transmission.

  • Smoke emitted from transmission.

POSSIBLE CAUSE

  • The malfunction is restricted to the hindrance of coolant at the oil cooler. In addition, overheating of the transmission may be caused by a malfunction of the TFT sensor.

    • Line pressure low

      • ATF level low

      • Incorrect throttle position signal

    • Oil cooler malfunction (Foreign material mixed in with ATF)

    • TFT sensor malfunction

    • Excessive amount of ATF

NOTE:

  • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)


Diagnostic procedure

STEP

INSPECTION

ACTION

1

Yes

Go to the next step.

No

Repair or replace any malfunctioning parts according to the inspection results.

2

Yes

Go to the next step.

No

Repair or replace any malfunctioning parts according to the inspection results.

3

Yes

Go to the next step.

No

Repair or replace part if necessary.

4

Yes

Go to the next step.

No

Replace the control valve body.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

5

  • Inspect for bending, damage, corrosion or kinks of the oil cooler pipes.

  • Are oil cooler pipes normal?

Yes

Replace the transmission.

(See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].)

No

Replace any malfunctioning parts.

6

  • Verify test results.

    • If normal, return to the diagnostic index to service any additional symptoms.

    • If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

      • If the vehicle is repaired, troubleshooting completed.

      • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.




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