Road Test
ROAD TESTCAUTION: Perform the test at normal operating fluid temperature (122 - 176°F or 50 - 80°C).
1. D RANGE TEST IN NORM AND PWR PATTERN RANGES
Shift into the D range and hold the accelerator pedal constant at the full throttle valve opening position.
Check the following:
a. 1->2, 2->3 and 3->O/D up-shifts should take place, and shift points should conform to those shown in the Automatic Shift Schedule.
Conduct a test under both Normal and Power patterns.
NOTE:
- There is no O/D up-shift and lock-up when the coolant temperature is below 140°F (60°C) (for A540E) or 122°F (50°C) (for A540H).
- When the coolant temperature is below 140°F (60°C) (for A540E) or 122°F (50°C) (for A540H), the shift point is lower than specified in the automatic shift schedule.
EVALUATION
1. If there is no 1->2 up-shift:
- No.2 solenoid is stuck
- 1->2 shift valve is stuck
2. If there is no 2->3 up-shift:
- No.1 solenoid is stuck
- 2->3 shift valve is stuck
3. If there is no 3->O/D up-shift:
- 3->4 shift valve is stuck
4. If the shift point is defective:
- Throttle valve, 1->2 shift valve, 2->3 shift valve, 3->4 shift valve etc., are defective
5. If the lock-up is defective:
- Lock-up solenoid is stuck
- Lock-up relay valve is stuck
b. In the same manner, check the shock and slip at the 1->2, 2->3 and 3->O/D up-shifts.
EVALUATION
If the shock is excessive:
- Line pressure is too high
- Accumulator is defective
- Check ball is defective
c. Run at the D range lock-up or O/D gear and check for abnormal noise and vibration.
NOTE: The check for the cause of abnormal noise and vibration must be make with extreme care as it could also be due to loss of balance in the drive shaft, tire, torque converter, etc.
d. While running in the D range, 2nd, 3rd and O/D gears, check to see that the possible kick-down vehicle speed limits for 2->1, 3->2 and O/D->3 kick-downs conform to those indicated on the Automatic Shift Schedule.
e. Check for abnormal shock and slip at kick-down.
f. Check for the lock-up mechanism.
1. Drive in D range, O/D gear, at a steady speed (lock-up ON) of about 75 km/h (47 mph).
2. Lightly depress the accelerator pedal and check that the engine rpm does not change abruptly.
If there is a big jump in engine rpm, there is no lock-up.
2. 2 RANGE TEST
Shift into the 2 range and, while driving with the accelerator pedal held constantly at the full throttle valve opening position, push in one of the pattern selectors and check on the following points.
a. Check to see that the 1->2 up-shift takes place and that the shift point conforms to it shown on the Automatic Shift Schedule.
b. While running in the 2 range and 2nd gear, release the accelerator pedal and check the engine braking effect.
EVALUATION
If there is no engine braking effect:
- Second coast brake is defective
c. Check for abnormal noise at acceleration and deceleration, and for shock at up-shift and downshift.
3. L RANGE TEST
a. While running in the L range, check to see that there is no up-shift to 2nd gear.
b. While running in the L range, release the accelerator pedal and check the engine braking effect.
EVALUATION
If there is no engine braking effect:
- First and reverse brake is defective
c. Check for abnormal noise during acceleration and deceleration.
4. R RANGE TEST
Shift into the R range and, while starting at full throttle, check for slipping.
5. P RANGE TEST
Stop the vehicle on a gradient (more than 5°) and after shifting into the P range, release the parking brake.
Then check to see that the parking lock paw holds the vehicle in place.
AUTOMATIC SHIFT SCHEDULE
A540E Shift Schedule:
A540H Shift Schedule:
NOTE:
1. Lock-up will not occur in 2nd gear unless the throttle valve opening is greater than 50%.
2. There is no lock-up in the 2 and L ranges.
3. In the following cases, the lock-up will be released regardless of the lock-up pattern.
- When the throttle is completely closed.
- When the brake light switch is ON.
4. When the coolant temperature is below 140°F (60°C) (A540E) or 122°F (50°C) (A540H), the shift point is lower than specified vehicle speed.