A/T Stall Speed Test

1.Engage the parking brake, and block all four wheels.

2.Connect the HDS to the DLC (A), and go to the A/T data list.

 

3.Make sure the A/C switch is OFF.

4.After the engine has warmed up to normal operating temperature (the radiator fan comes on), shift to the 2 position.

5.Fully press the brake pedal and accelerator pedal for 6 to 8 seconds, and note the engine speed. Do not move the shift lever while raising engine speed.

6.Allow 2 minutes for cooling, then repeat the test in the D, 1, and R positions.

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, 2, 1, and R positions.
  • Do not test stall speed with the A/T pressure gauges installed.

Stall Speed rpm:
Specification: 2,100 rpm (min-1) 
Service Limit: 1,950-2,250 rpm (min-1) 

7.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, 2, 1, and R positions 
  • Low fluid level
  • ATF pump output low
  • Clogged ATF strainer
  • Regulator valve stuck
  • Slipping clutch
 
Stall speed rpm high in the 1 position Slippage of 1st clutch 
Stall speed rpm high in the 2 position Slippage of 2nd clutch 
Stall speed rpm high in the R position Slippage 4th clutch 
Stall speed rpm low in the D, 2, 1, and R positions 
  • Engine output low
  • Engine throttle valve closed
  • Torque converter one-way clutch slipping