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].)


STEP	INSPECTION		ACTION
1	• Is the line pressure normal? (See Line Pressure Test.)	Yes	Go to the next step.
1	• Is the line pressure normal? (See Line Pressure Test.)	No	Repair or replace any malfunctioning parts according to the inspection results.
2	• Is stall speed normal? (See Stall Speed Test.)	Yes	Go to the next step.
2	• Is stall speed normal? (See Stall Speed Test.)	No	Repair or replace any malfunctioning parts 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.
3		No	Repair or replace part if necessary.
4	• Inspect the line pressure control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is it normal?	Yes	Go to the next step.
4		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].)
5		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 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.