NO.23 TRANSAXLE OVERHEATS [FN4A-EL]

id050301802800

23
Transaxle overheats
DESCRIPTION
•  Burnt smell emitted from the transaxle.
•  Smoke is emitted from the 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.  Burnt (TCC)
•  Line pressure low
•  Control valve body malfunction
•  APP 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. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FN4A-EL].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect for bent, damage, corrosion or kinks of oil cooler pipes.
Are the oil cooler pipes normal?
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts.
2
Perform the stall test.
(See MECHANICAL SYSTEM TEST [FN4A-EL].)
Is the stall speed normal?
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts.
3
Inspect the APP PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts.
4
Disconnect the PCM connector.
Measure the resistance between ground terminal at the PCM connector and body ground.
Is the resistance less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
5
Inspect the LPS PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
If any problem remains:
•  Overhaul the transaxle and repair or replace any malfunctioning parts.
No
Repair or 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. (See PCM REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)