A/T - Torque Converter Diagnosis - Technical Service Bulletin Summary
ranges. Pump whine will vary with pressure ranges.
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Chain and sprocket noise will be evident in park or neutral, and engine running. It is a whine or growl that increases and fades with vehicle speed,
most noticeable under light throttle acceleration. A slipping chain will cause a loud rattle during heavy acceleration. Chain noise will stop when the
transaxle is shifted into Drive or Reverse gear ranges with vehicle standing and foot on brake.
SERVICE NOTES:
The converter should not be replaced if:
Fluid has an odor or is discolored but no evidence of metal or burned and distressed clutch plate material.
If the transmission condition did not display evidence of damaged or worn internal parts, steel particles or clutch plate lining material in unit and inside
fluid filter.
Vehicle has been exposed to high mileage (only). The exception may be where the Torque Converter Clutch dampener plate lining has been exposed to
excess wear by vehicles operated in heavy and/or constant traffic, such as taxi, delivery or police use.
The Torque Converter should be replaced under any of the following conditions:
Vehicle has TCC shudder and/or No TCC apply but, only after all Electrical and Hydraulic diagnosis has been made (Converter Clutch material may be
glazed).
Evidence of damage to the pump assembly or steel particles in converter.
Steel particles are found after flushing the cooler and cooler lines.
External leaks in the hub weld area.
Converter pilot is broken, damaged or poor fit into crankshaft.
Converter hub is scored or damaged.
Internal failure to stator roller clutch.
Contamination from engine coolant.
Excess end play found after checking converter for end play.
Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are worn or damaged indicating lining material
came from converter.
Heavy clutch debris due to Overheating (Blue Converter).
SERVICE MANUAL REFERENCE:
Refer to the Unit Repair section of your Service Manual whenever checking the torque converter for end play and/or replacement of the Torque
Converter is necessary.
