Table of contents: Procedure ↓ Interpretation of results ↓
Procedure
1. Check the fluid and oil levels in the engine and gearbox. If necessary, bring them up to standard.
2. Warm up the oil in the engine and gearbox by driving for about 10 minutes. The operating temperature of the ATF is 50-80°C.
3. Apply the parking brake and place chocks under the wheels.
4. Attach an accurate tachometer and position it within the driver's line of sight.
5. Start the engine, press the brake pedal and move the selector to position D.
6. Without releasing the brake pedal, slowly press the accelerator pedal all the way down.
7. Note the maximum RPM and immediately release the accelerator pedal. Do not hold the throttle fully open for more than 5 seconds. The engine speed for this test is given in the "Adjustment and Monitoring Data" section.**
8. Move the selector to position N.
9. Cool the ATF by letting the engine idle for at least 1 minute.
10. Repeat steps 5-9, moving the selector to positions 2, 1 and R.
Interpretation of results
Below are the possible test results as a four-letter string representing high (H), low (L), and normal (N) engine speed for selector positions D, 2, 1, and R. Following the results string are components that may be faulty.
H H H N — forward gear clutches, one-way 1st gear clutch.
NNN H — 1st gear and reverse gear brake, reverse gear clutch.
LLLL — torque converter clutch, engine.
H H H H - pressure control circuit (aTF pressure is low), forward gear clutches, 1st gear and reverse gear clutches and brakes.
NNNN — clutches and brakes, except for the 3rd and 4th gear clutch, band brake and overrunning clutch, are in order. (The listed components cannot be tested using this test.)