NO.32 TRANSAXLE OVERHEATING[LA4AX-EL (CD4E)]

id0503a2806900

32

Transaxle overheating

POSSIBLE CAUSE

•  ATF

•  Powertrain control system malfunction

•  Oil cooler malfunction

•  Control valve body malfunction

•  Torque converter clutch malfunction

•  Oil pump malfunction

•  Chain pan malfunction

•  Thermostatic oil level control valve malfunction

•  Transaxle case/converter housing/starter support malfunction

32	Transaxle overheating
POSSIBLE CAUSE	• ATF • Powertrain control system malfunction • Oil cooler malfunction • Control valve body malfunction • Torque converter clutch malfunction • Oil pump malfunction • Chain pan malfunction • Thermostatic oil level control valve malfunction • Transaxle case/converter housing/starter support malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	ATF • Are there any problems with the following? ― Level ― Condition (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[LA4AX-EL (CD4E)].)	Yes	Service if necessary
1		No	Go to the next step
2	Powertrain control system • Are there any malfunctions with the following? ― Electrical input/output ― Vehicle wiring harness ― PCM ― TCC solenoid ― Transaxle fluid temperature (TFT) sensor ― Turbine shaft speed (TSS) sensor	Yes	Perform OBD Tests Perform DTC troubleshooting (See AUTOMATIC TRANSAXLE ON-BOARD DIAGNOSTIC FUNCTION[LA4AX-EL (CD4E)].)
2		No	Go to the next step
3	Oil cooler • Do any of the following malfunctions exist? ― Damaged ― Blocked ― Reversed ― Restricted ― Leaking ― Misassembled (See OIL COOLER REMOVAL/INSTALLATION[LA4AX-EL (CD4E)].)	Yes	Service if necessary
3		No	Go to the next step
4	Control valve body • Do any of the following malfunctions exist? ― Bolts are not tightened to the specification ― Main regulator valve, bypass clutch control valve, converter regulator valve are stuck, damaged, or misassembled ― Hydraulic passages are damaged ― Separator plates/gaskets are damaged ― TCC solenoid malfunction (OFF)	Yes	Service if necessary
4		No	Go to the next step
5	Torque converter clutch • Does the torque converter clutch apply?	Yes	Go to the next step
5		No	Perform the symptom troubleshooting No.27 (See SYMPTOM TROUBLESHOOTING ITEM TABLE[LA4AX-EL (CD4E)].)
6	Oil pump • Does either of the following malfunctions exist? ― Gasket is damaged ― Rear lube passage is blocked	Yes	Service if necessary
6		No	Go to the next step
7	Chain pan • Is it missing?	Yes	Install the chain pan
7	Chain pan • Is it missing?	No	Go to the next step
8	Thermostatic oil level control valve • Do any of the following malfunctions exist? ― Stuck open or damaged ― Gasket is damaged or missing ― Bolt or bracket is damaged, missing, or improperly installed	Yes	Service if necessary
8		No	Go to the next step
9	Transaxle case/converter housing/starter support • Do either of the following malfunctions exist? ― Front lube passage is blocked or restricted ― TC, CI, CT passages are blocked or restricted	Yes	Service if necessary
9		No	The malfunction is not in the automatic transaxle Inspect the cooling system
10	• 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.