Road Test

ROAD TEST

CAUTION: Perform the test at normal operating fluid temperature (50-80°C or 122-176°F)

1. D RANGE TEST IN NORM AND PWR PATTERN RANGES

Shift into the D range and hold accelerator pedal constant at 50° and 100° throttle valve opening positions. Push in one of the pattern selection buttons with OD the switch ON and check the following:

(a) 1-2, 2-3, 3-OD and lock-up up-shifts should take place, and shift points should conform to those shown in the automatic shift diagram.

NOTE:
(1) There is no OD up-shift when coolant temperature is below 50°C (1 22°F).
(2) There is no lock-up when the vehicle speed is 10 km/h (6 mph) less than the set cruise control speed.

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 - OD up-shift (throttle valve opening 1/2):
- 3-OD shift valve is stuck

(4) If the shift point is defective:
- Throttle valve, 1-2 shift valve, 2-3 shift valve, 3-OD shift valve ect., are defective.

(5) If the lock-up is defective:
- No.3 solenoid is stuck
- Lock-up relay valve is stuck

(b) In the same manner, check the shock and the slip at 1 - 2, 2 - 3 and 3 - OD up-shifts.

EVALUATION
If the shock is severe:
- Line pressure is too high
- Accumulator is defective Check ball is defective

(c) Run in the OD gear of the D range and with the lock-up in operation, and check for abnormal noise and vibration.

NOTE: Check for cause of abnormal noise and vibration must be made with extreme care as they could also be due to unbalance in the drive shaft, differential, tire, torque converter, etc. or insufficient bending rigidity, etc., in the power train.

(d) While running in the D range 2nd, 3rd gears and OD, check to see that the possible kick-down vehicle speed limits for 2-1, 3-2, OD-3 and OD-2 kick-downs conform to those indicated on the automatic shift diagram.

(e) Check for abnormal shock and slip at kick-down.

(f) While running about 80 km/h (50 mph) in the D range OD gear, shift into the 2 and L ranges and check the engine braking effect at each of these ranges.

EVALUATION

(1) If there is no engine braking effect at the 2 range.
3rd Gear
Second brake is defective.

2nd Gear
Second brake and second coast brake are defective.

(2) If there is no engine braking effect at the L range.
2nd Gear
Second brake and second coast brake are defective.

1st Gear
First and reverse brake are defective.

(g) While running in the D range, release your foot from the accelerator pedal and shift into the L range. Then check to see if OD - 3, 3 - 2 and 2 - 1 down-shift points conform to those indicated on the automatic shift diagram;

2. INSPECT LOCK-UP MECHANISM

(a) Connect a voltmeter to service connector terminals ECT and E1.

(b) Select the normal pattern.

(c) Drive at around 50 km/h (31 mph) to where 7, 5 or 3 volts appears on the voltmeter (this is the lock-up range).

(d) Depress the accelerator pedal and read the tachometer. If there is a big jump in engine rpm there is no lock-up.

3. 2 RANGE TEST

Shift into the 2 range and while driving with the accelerator pedal held constant at specified point (throttle valve opening 50% and 100% push in one of the pattern selectors, check on the following points.

(a) At each of the above throttle openings, check to see that 1 - 2, up-shift take place and also that the shift points conform to those shown on the automatic shift diagram.

NOTE:
- To prevent overrun, the transmission up shift into 3rd gear at around 120 km/h (75 mph).

- In range 2, there will be no lock-up to 2nd gear.

(b) While running in the 2 range, 2nd gear, release the accelerator pedal and check the engine braking effect.

(c) Check for abnormal noise at acceleration and deceleration, and for shock at up-shift and down-shift.

4. L RANGE TEST

(a) While running above 80 km/h (50 mph) in the D or 2 range, release your foot from the accelerator pedal and shift into L range. Then check to see that the 2 - 1 down shift point conforms to 50 km/h (31 mph).

(b) While running in the L range, check to see that there is no up-shift to 2nd gear.

(d) Check for abnormal noise at acceleration and deceleration.

5. R RANGE TEST

Shift into the R range and, while starting at full throttle, check for slipping

6. P RANGE TEST

Stop the vehicle on a gradient (more than 50) and after shifting into the P range, release the parking brake. Then check to see that the parking lock pawl holds the vehicle in place.