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. Fully press the brake pedal and 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 D and R positions.
   - Do not test stall speed with the A/T pressure gauges installed.

   Stall Speed rpm
   K20A6 Engine model
   Specification: | 2,100 rpm (min −1 )
   Service Limit: | 1,950−2,250 rpm (min −1 )
   K24A3 Engine model
   Specification: | 2,000 rpm (min −1 )
   Service Limit: | 1,850−2,150 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 |
   - Low fluid level
   - 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