NO.23 TRANSAXLE OVERHEATS[GF4AX-EL]

id0503a3802800

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.
1.  Line pressure low
•  ATF level low
•  APP sensor malfunction
•  Throttle cable mis-adjustment
2.  Oil cooler malfunction (Foreign material mixed in ATF)
3.  TFT sensor malfunction
4.  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.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Is the line pressure normal?
(See MECHANICAL SYSTEM TEST[GF4AX-EL].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the inspection results.
2
Is the stall speed normal?
(See MECHANICAL SYSTEM TEST[GF4AX-EL].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the inspection results.
3
Turn the ignition switch to the ON position.
Connect the M-MDS to DLC-2.
Access TFT and TFTV PIDs.
Drive the vehicle while monitoring PIDs.
(See PCM INSPECTION[L3].)
Are the PIDs within the specification?
Yes
Go to the next step.
No
Inspect the TFT sensor and related wiring harness: for intermittent open/short circuit during vibration.
4
Simulate LPS PID for 50 %.
Is operating sound of the pressure control solenoid heard?
Yes
Go to the next step.
No
Inspect connection of the pressure control solenoid terminal on the ATX for bent terminals damage, corrosion or looseness.
Inspect for stuck pressure control solenoid?
(See SOLENOID VALVE INSPECTION[GF4AX-EL].)
If the pressure control solenoid is normal, inspect for open or short circuit between the PCM terminal 1B and the pressure control solenoid terminal G.
5
Inspect for bent, damaged, corrosion or kinks of the oil cooler pipes.
Are the oil cooler pipes normal?
Yes
Replace the control valve body and repair or replace any malfunctioning parts.
(See ATX Workshop Manual (GF4AX-EL))
If any problem remains, replace the transaxle and repair or replace any malfunctioning parts.
(See ATX Workshop Manual (GF4AX-EL))
No
Replace any malfunctioning parts.
6
•  Verify the 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 is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.