Stall Speed Test
- Make sure the transmission fluid is filled to the proper level (see ATF LEVEL CHECK ).
- Apply the parking brake, and block all four wheels.
- Connect the HDS to the DLC (A), and go to the A/T data list.
- Make sure the A/C switch is OFF.
- After the engine has warmed up to normal operating temperature (the radiator fan comes on), shift to the 2 position.
- 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.
- 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: 2,400 rpm
Service Limit: 2,250-2,550 rpm
- If the measurements are out of the service limit, problems and probable causes are listed in the table.PROBLEMS AND PROBABLE CAUSES
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 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