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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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NO.23 TRANSMISSION OVERHEATS [SJ6A-EL]

23	Transmission overheats
DESCRIPTION	Burnt smell is emitted from the transmission. Smoke is emitted from the 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 accelerator pedal position signal Oil cooler malfunction (Foreign material mixed in with ATF) TFT sensor malfunction Excessive amount of ATF

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Is the line pressure normal? (See MECHANICAL SYSTEM TEST [SJ6A-EL].)	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results.
2	Is the stall speed normal? (See MECHANICAL SYSTEM TEST [SJ6A-EL].)	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results.
3	Inspect the TFT sensor and related wiring harness (vibration, intermittent open/short circuit). (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].) Is it normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results.
4	Inspect the line pressure control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) Is it normal?	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	Overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) (See Automatic Transmission Workshop Manual [SJ6A-EL].)
		No	Repair or replace the malfunctioning part according to the inspection results.
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. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)

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