A/T Stall Speed Test (R18A: A/T)

A/T Stall Speed Test

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

2.Apply the parking brake, and block all four wheels.

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

NOTE: If the HDS does not communicate with the PCM, troubleshoot the DLC circuit.

 

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

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

6.Firmly 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.

7.Allow 2 minutes for cooling, then repeat the test in the 2 and 1 (for 7-position transmission), 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 the D, 2, 1, and R positions.
  • Do not test stall speed with the A/T pressure gauges installed.

Stall Speed rpm (min-1) 
Specification: 2,670 rpm (min-1) 
Service Limit: 2,520-2,820 rpm (min-1) 

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

7-position Automatic Transmission
Problem Probable causes 
Stall speed rpm high in the D, 2, 1, and R positions 
  • 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 of 5th 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
 


5-position Automatic Transmission
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 of 5th clutch 
Stall speed rpm low in the D and R positions 
  • Engine output low
  • Engine throttle valve closed
  • Torque converter one-way clutch slipping