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 accelerator pedal position signal

• Oil cooler malfunction (Foreign material mixed in with ATF)

• TFT sensor malfunction

• Excessive amount of ATF

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 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. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)