NO.22 TRANSMISSION OVERHEATS [5R55S]

id0503c1814100

22

Transmission overheats

DESCRIPTION

•  Burnt smell emitted from transmission.

•  Smoke emitted from transmission.

POSSIBLE CAUSE

•  The malfunction maybe restriction in the cooling system. The technician needs to diagnose the complete cooling system. Include coolers, line, and hoses. In addition, overheating of the transmission may be caused by a malfunction of the TFT sensor.

1.  Burning (TCC)

•  Line pressure

•  Improper fluid level

•  Control valve body malfunction

2.  Oil cooler malfunction (Foreign material mixed ATF)

3.  Excessive amount of ATF

4.  Torque converter malfunction

•  TCC control solenoid malfunction

•  Pressure control solenoid A malfunction

•  Pressure control solenoid B malfunction

•  Pressure control solenoid C malfunction

•  Excessive tow load

•  Vehicle over load

•  Engine concern

Note

•  Before the following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspections are conducted.
(See BASIC INSPECTION [5R55S].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Inspect oil cooler pipes for bending, damage, corrosion or kinks. Are the oil cooler pipes normal?	Yes	Go to the next step.
1		No	Replace any malfunctioning parts.
2	Is the line pressure normal. (See MECHANICAL SYSTEM TEST [5R55S].)	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts according to the inspection results.
3	Perform the stall test. (See MECHANICAL SYSTEM TEST [5R55S].) Is the stall speed normal?	Yes	Go to the next step.
3		No	Repair or replace any malfunctioning parts.
4	Check the value at the following PCM PIDs using the IDS/PDS. (See PCM INSPECTION (Thailand, General (L.H.D. R.H.D.) specs.) [WL-C, WE-C].) • TFT • TCC • PCA • PCB • PCC Are the PID values normal?	Yes	Go to the next step.
4		No	Repair or replace any malfunctioning parts.
5	Disconnect the TCM connector. Is the resistance between TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Go to the next step.
5		No	Repair the wiring harness. Reconnect the TCM connector.
6	Inspect pressure control solenoid A, B and C. (See SOLENOID VALVE INSPECTION [5R55S].) Is it normal?	Yes	Clean and inspect main control and the thermo static bypass valve. If parts are damaged, replace main control. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
6		No	Repair or replace any malfunctioning parts.
7	• 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 repaired, the troubleshooting is completed. • If the vehicle the not repaired or additional diagnostic information is not available, replace the TCM.