NO.23 TRANSMISSION OVERHEATS [SJ6A-EL]

id050307809700

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 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	• Is the line pressure normal? (See MECHANICAL SYSTEM TEST [SJ6A-EL].)	Yes	Go to the next step.
1		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.
2		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.
3		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.
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	Overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) (See Automatic Transmission Workshop Manual [SJ6A-EL].)
5		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 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].)