Other Concern: Transmission Overheating

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

OTHER CONCERN: TRANSMISSION OVERHEATING

Possible Component	Reference/Action
257 - ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, Torque Converter Clutch (TCC) solenoid, Pressure Control Solenoids A, B, C, Transmission Fluid Temperature (TFT) sensor	Carry out on-board diagnostic tests. See INTRODUCTION - GASOLINE article for diagnosis and testing of the PCM. GO to PINPOINT TEST A , GO to PINPOINT TEST B and GO to PINPOINT TEST D . Repair as required. Clear DTCs, road test and rerun on-board diagnostic test.
Fluid
Incorrect level	Adjust to correct level. Refer to TRANSMISSION FLUID LEVEL CHECK in this article.
Hydraulic/Mechanical
Thermostatic by-pass valve in the main control valve body assembly	Verify correct thermal valve function while monitoring TFT. Drive the vehicle for about 32 km (20 miles) or 20 minutes. If the temperature exceeds 102°C (215°F) during the drive, then install a new main control valve body assembly.
Incorrect Pressures
High/low pressures	Check pressure at line and PC C taps. Carry out Line Pressure Test. Refer to SPECIAL TESTING PROCEDURES in this article.
Main Control
Screws not tightened to specification	Tighten to specification.
Separator plate damaged	Inspect for damage. If damaged, install a new separator plate.
Contamination	Disassemble and clean.
Valves/springs damaged, misassembled, missing, stuck or bore damaged, thermostatic bypass valve damaged	If damaged or parts are missing, install new main control assembly. If misassembled, reassemble correctly. DO NOT stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.
Thermostatic by-pass valve damaged or malfunctioning.	If the verification procedure confirms the malfunction, install a new main control valve body assembly. If not malfunctioning, inspect for damage. If damaged, install a new main control valve body assembly.
Filter damaged, missing	Inspect for damage, repair as necessary.
Fluid Pump Assembly
Screws not tightened to specification	Tighten screws to specification.
Gasket damaged	Inspect for damage. If damaged, install a new gasket.
Porosity, cross leaks, ball missing, plugged hole	Inspect for damage. If damaged, repair as necessary.
Pump gears cracked and/or seized	Inspect for damage. Install a new pump.
Flow control valves, springs or seals damaged, stuck or not assembled correctly	Inspect for damage. Install a new seal or flow control valve.
Case
Case vent damaged	Inspect for damage. If damaged, repair as necessary.
Torque Converter Assembly
Seized torque converter one-way clutch Excessive slip detected	Remove the transmission. Inspect for damage. Refer to TORQUE CONVERTER in the General Procedures portion of this article. If the torque converter fails to pass the criteria or is damaged, install a new or remanufactured torque converter.
Other
Restriction in the transmission cooling system	Refer to TRANSAXLE/TRANSMISSION COOLING for information and diagnosis of cooling issues.
Excessive trailer tow load	Refer to the owner guide for specifications on trailer towing.
Engine driveability concerns	Check engine. Refer to ENGINE SYSTEM-GENERAL INFORMATION .