A/T Stall Speed Test

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

2.Connect a tachometer to the engine, and start the engine.

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 [2] position.

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

6.Allow 2 minutes for cooling, then repeat the test in [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 stall speed with the A/T pressure gauges installed.

Stall Speed rpm:
 Specification: 2,320 rpm (min-1) 
 Service Limit: 2,170-2,470 rpm (min-1) 

7.If the measurements are out of the service limit, problems and probable causes are listed in the table below:

Problem Probable causes 
Stall speed rpm high in [D], [2], [1] and [R] positions 
  • Low fluid level
  • ATF pump output low
  • ATF pump defective
  • Clogged ATF strainer
  • Pressure regulator valve stuck closed
 
Stall speed high in [R] position Slippage of 4th clutch 
Stall speed high in [2] position Slippage of 2nd clutch 
Stall speed high in [1] position Slippage of 1st clutch 
Stall speed low in [D], [2], [1] and [R] positions 
  • Engine output low
  • Engine throttle valve closed
  • Torque converter one-way clutch slipping