NO.23 TRANSAXLE OVERHEATS [FN4A-EL]

id050301802800

23
Transaxle overheats
DESCRIPTION
•  Burnt smell emitted from transaxle.
•  Smoke emitted from transaxle.
POSSIBLE CAUSE
•  The malfunction is restricted to hindrance of coolant at the oil cooler. In addition, overheating of the transaxle may be caused by a malfunction of the TFT sensor.
1.  Burned (TCC)
•  Line pressure low
•  Control valve body malfunction
•  Accelerator pedal position sensor malfunction
2.  Oil cooler malfunction (Foreign material mixed ATF)
3.  TFT sensor malfunction
4.  Excessive amount of ATF
5.  Torque converter malfunction
Note
•  Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect for bent, damage, corrosion or kinks of oil cooler pipes.
Are oil cooler pipes okay?
Yes
Go to next step.
No
Replace any defective parts.
2
Perform the stall test.
(See MECHANICAL SYSTEM TEST [FN4A-EL].)
Is stall speed okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
3
Check the value at the following PID using the M-MDS.
(See PCM INSPECTION [MZR 1.3, MZR 1.5].)
•  APP
Is PID value okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
4
Disconnect PCM connector.
Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?
Yes
Go to next step.
No
Repair open GND circuit.
Reconnect PCM connector.
5
Check LPS PID value.
Is LPS PID value okay?
(See PCM INSPECTION [MZR 1.3, MZR 1.5].)
Yes
Overhaul control valve body and repair or replace any defective parts.
If problem remains, overhaul transaxle and repair or replace any defective parts.
No
Repair or replace any defective parts.
6
•  Verify test results.
―  If okay, return to diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service informations and perform repair or diagnosis.
•  If vehicle not repaired, trouble shooting completed.
•  If vehicle not repaired or additional diagnostic information not available, replace PCM.