Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting

• Troubleshooting
  • Symptoms - Automatic Transmission
  • Range Selector Displays Incorrect Range
    • Notes
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Tow/Haul Switch/Indicator Always On or Inoperative
    • Notes
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Transmission Fluid Checking Procedure
  • Line Pressure Check Procedure
    • Notes
    • Tools Required
    • Check Procedures
  • Road Test Procedure
    • Notes
    • Electrical Function Check
    • Upshift Control and Torque Converter Clutch (TCC) Apply
    • Part Throttle Detent Downshift
    • Full Throttle Detent Downshift
    • Manual Downshifts
    • Coasting Downshifts
    • Manual Gear Range Selection
  • Torque Converter Diagnosis Procedure
    • Notes
    • Torque Converter Stator
    • Poor Acceleration at Low Speed
    • Poor Acceleration at High Speed
    • Whine Noise
    • Torque Converter Clutch Shudder
    • If Shudder Occurs After TCC has Applied
    • Torque Converter Evaluation and Diagnosis
  • Flexplate/Torque Converter Vibration Test
    • Isolating Vibration
    • Indexing Torque Converter
  • Noise and Vibration Analysis
  • Clutch Plate Diagnosis
    • Composition Plates
    • Steel Plates
    • Causes of Burned Clutch Plates
  • Engine Coolant/Water in Transmission
  • Fluid Leak Diagnosis
    • General Method
    • Powder Method
    • Dye and Black Light Method
    • Find the Cause of the Leak
    • Possible Points of Fluid Leaks
  • Case Porosity Repair
  • Shift Solenoid Leak Test
    • Tools Required
    • Test Procedure
  • Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A)
    • Notes
    • Preparation
    • Back Flush
    • Forward Flush
    • Flow Test
    • Clean-up
  • Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096)
    • Notes
    • Cooler Flow Check and Flushing Steps
    • Machine Set-up
    • Determine Minimum Flow Rate
    • Back Flush Procedure
    • Forward Flush
    • Flow Test
    • Code Recording Procedure
    • Clean-up
  • Automatic Transmission Fluid Leaks
  • High Line Pressure
  • Forward Motion in Neutral
  • Inadequate Lubrication at Low Line or Heavy Loads
  • Inadequate Lubrication
  • Engine Stall in Neutral
  • Loss of Power
  • No Torque in Reverse and Third
  • Transmission Overheats
  • Transmission Overheats at WOT
  • Low Line Pressure
  • Engine Starts in Gear
  • Shift Lever Indicates Wrong Gear
  • No Gear Selection
  • Loss of Drive
  • No Park
  • Remains in Park
  • Difficult to Shift Out of Park
  • Does Not Stay in Park
  • No Reverse
  • No First Gear - D1
  • No Second Gear - D1
  • No Overrun Braking - D1
  • No Engine Braking - D1
  • No First Gear - D2
  • No Second Gear - D2
  • No Overrun Braking - D2
  • No Engine Braking - D2
  • No Second Gear Engine Braking - D2
  • No First Gear - D3
  • No Second Gear - D3
  • No Third Gear - D3
  • No Overrun Braking - D3
  • No Engine Braking - D3
  • No First Gear - D4
  • First Gear Only - D4
  • First and Second Gear Only - D4
  • Second Gear Only - D4
  • Second and Third Gear Only - D4
  • First and Fourth Gear Only - D4
  • Third and Fourth Gear Only - D4
  • No Second Gear - D4
  • No Third Gear - D4
  • No Fourth Gear - D4
  • No Torque Converter Clutch (TCC) Apply
  • Soft Torque Converter Clutch (TCC) Apply
  • Torque Converter Clutch (TCC) Slipping
  • Torque Converter Clutch (TCC) Stuck On
  • Incorrect Torque Converter Clutch (TCC) Apply or Release
  • Converter Ballooning
  • No Torque Multiplication
  • Fluid Foaming
  • Noise
  • Engine Stall
  • Vibration
  • Oil Out the Vent Tube
  • No Torque in Second Gear
  • Second Gear Starts
  • Third Gear Starts
  • Fourth Gear Starts
  • Erratic Shift Quality
  • Transmission Slips
  • Case Extension Bearing/Seal Failed
  • Inaccurate Shift Points
  • Harsh Shifts
  • Harsh Shift D to R
  • Harsh Shift 3 to 4
  • Harsh Shift 4 to 3
  • Harsh Shift D4 to D3, D2, or D1
  • Soft Shifts
  • Soft Shift into R
  • Soft Shift R to D
  • Soft Shift 2 to 1
  • Soft Shift 2 to 3
  • Soft Shift 3 to 2
  • Soft Shift D3 to D2
  • Delayed Shift 1 to 2
  • No D2 to D1
  • No D3 to D2