Fig. 3.73. Position of torque converter clutches
The purpose of this test is to measure the maximum engine crankshaft speed with the automatic transmission output shaft fully braked in the "D" and "R" ranges. The value of this speed can be used to determine the operability of the torque converter stator overrunning clutch, as well as the presence of slippage in the friction clutches and brakes of the automatic transmission.
Caution: Do not allow anyone to be in front or behind the vehicle during this test.
Check the automatic transmission fluid level and temperature, as well as the engine coolant temperature.
Automatic transmission oil level (ATF): at the "HOT" mark on the dipstick.
Automatic transmission oil temperature (ATF): 80–100°C.
Engine coolant temperature: 80–100°C.
Install brake pads under the rear wheels of the car (left and right).
Fully lift the parking brake lever and depress the brake pedal all the way.
Start the engine.
Set the automatic transmission selector lever to position "D", press the accelerator pedal all the way down and determine the engine crankshaft speed at this moment.
Caution: Do not hold the throttle fully open for more than 8 seconds during this test.
If this test needs to be performed more than once, after each test, move the automatic transmission selector lever to the "N" position and let the engine run at 1000 min⁻¹ for 2 minutes to cool the automatic transmission fluid (ATF) between tests.
Nominal value of engine speed with the vehicle fully braked (stall test): 2100–2900 min⁻¹.
Move the selector lever to the "R" position and repeat the check with the vehicle fully braked, similar to the points mentioned above.
Nominal value of engine speed with the vehicle fully braked (stall test): 2100–2900 min⁻¹.