NO.23 TRANSAXLE OVERHEATS [AW6A-EL, AW6AX-EL]

id050310802800

23

TRANSAXLE OVERHEATS

DESCRIPTION

•  Burnt smell emitted from transaxle.

•  Smoke emitted from transaxle.

POSSIBLE CAUSE

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

―  Line pressure low

•  ATF level low

•  Incorrect accelerator opening signal

•  Line pressure control solenoid malfunction

―  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 Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION [AW6A-EL, AW6AX-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Is the line pressure normal? (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].)	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts according to the inspection results.
2	• Is stall speed normal? (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].)	Yes	Go to the next step.
2		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 TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR INSPECTION [AW6A-EL, AW6AX-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 [AW6A-EL, AW6AX-EL].) • Is it normal?	Yes	Go to the next step.
4		No	Inspect the coupler component. • If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
5	• Inspect for bending, damage, corrosion or kinks of the oil cooler pipes. • Are oil cooler pipes normal?	Yes	Overhaul the transaxle and repair or replace any malfunctioning parts. (See Automatic Transaxle and Transfer Workshop Manual AW6A-EL AW6AX-EL.)
5		No	Replace any malfunctioning parts.
6	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the 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.