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.
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 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].)