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A/T Stall Speed Test

  1. Apply the parking brake, and block all four wheels.
  1. Connect the HDS to the DLC (A), and go to the A/T data list. If the HDS does not communicate with the PCM, troubleshoot the DLC circuit.
  1. Make sure the A/C switch OFF.
  1. After the engine has warmed up to normal operating temperature (the radiator fan comes on), shift to D.
  1. Firmly press and hold the brake pedal then, while still holding the brake pedal, press the accelerator pedal for six to eight seconds, and note maximum engine speed. Do not move the shift lever while raising engine speed.
  1. Allow 2 minutes for cooling, repeat the test for the seven-position transmission in 2, and allow 2 minutes, then repeat test in 1.
  1. Allow 2 minutes for cooling, then repeat the test in R.
    NOTE:
    • Do not test stall speed for more than 10 seconds at a time.
    • Stall speed tests should be used for diagnostic purposes only.
    • The stall speed should be the same in D, 2, 1, and R.
    • Do not test stall speed with the A/T pressure gauges installed.
    Stall Speed rpm
    Specification:
    2,200 rpm (min −1 )
    Service Limit:
    2,050−2,350 rpm (min −1 )

  1. If any of the stall speeds are out of the service limit, refer to the problems and probable causes listed in the table.

    Seven-position Transmission

    Problem
    Probable Causes
    Stall speed rpm high in D, 2, 1, and R
    • ATF pump output low
    • Clogged ATF strainer
    • Regulator valve stuck
    • Slipping clutch
    Stall speed rpm high in 2
    Slippage of 2nd clutch
    Stall speed rpm high in 1
    Slippage of 1st clutch
    Stall speed rpm high in R
    Slippage of 5th clutch
    Stall speed rpm low in D, 2, 1, and R
    • Engine output low
    • Engine throttle valve closed
    • Torque converter one-way clutch slipping


    Five-position Transmission

    Problem
    Probable Causes
    Stall speed rpm high in D and R
    • ATF pump output low
    • Clogged ATF strainer
    • Regulator valve stuck
    • Slipping clutch
    Stall speed rpm high in R
    Slippage of 5th clutch
    Stall speed rpm low in D and R
    • Engine output low
    • Engine throttle valve closed
    • Torque converter one-way clutch slipping