NO.23 TRANSAXLE OVERHEATS [AY6A-EL, AY6AX-EL]

id0503k3802800

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 [AY6A-EL, AY6AX-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Inspect the TFT sensor and related wiring harness: vibration, intermittent open/short circuit
•  Is it normal?
Yes
Go to the next step.
No
Repair or replace part if necessary.
2
•  Inspect the line pressure control solenoid.
•  Is it normal?
Yes
Go to the next step.
No
Inspect the coupler component.
If normal, replace the control valve body.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
3
•  Inspect for bending, damage, corrosion or kinks of the oil cooler pipes.
•  Are oil cooler pipes normal?
Yes
Replace the transaxle.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No
Replace any malfunctioning parts.
4
•  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.