A/T Stall Speed Test

1. Make sure the transmission fluid is filled to the proper level.

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