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.
    NOTE: The illustration shows LHD model; RHD model is symmetrical.
  1. Make sure the A/C switch is OFF.
  1. After the engine has warmed up to normal operating temperature (the radiator fan comes on), shift to the D position.
  1. Firmly press the brake pedal and fully press the accelerator pedal for 6 to 8 seconds, and note engine speed. Do not move the shift lever while raising engine speed.
  1. Allow 2 minutes for cooling, then repeat the test in the R position.
    NOTE:
    • Do not test stall speed for more than 10 seconds at a time.
    • Stall speed tests should be used for diagnostic purposes only.
    • Stall speed should be the same in the D and R positions.
    • Do not test stall speed with the A/T pressure gauges installed.
    Stall Speed rpm
    K20Z2 engine model
    Specification:
    2,100 rpm (min −1 )
    Service Limit:
    1,950−2,250 rpm (min −1 )
    K24A3 engine model
    Specification:
    2,400 rpm (min −1 )
    Service Limit:
    2,250−2,550 rpm (min −1 )

  1. If the measurements are out of the service limit, problems and probable causes are listed in the table.
    Problem
    Probable causes
    Stall speed rpm high in the D and R positions
    • ATF pump output low
    • Clogged ATF strainer
    • Regulator valve stuck
    • Slipping clutch
    Stall speed rpm high in the R position
    Slippage 4th clutch
    Stall speed rpm low in the D and R positions
    • Engine output low
    • Engine throttle valve closed
    • Torque converter one-way clutch slipping