Toyota 4Runner: Road Test

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Road Test

ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION

(a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transmission does not shift up or shift down, or that the shift point is too high or too low, conduct the following road test while referring to the automatic shift schedule and reproduce the problem symptoms.

2. ROAD TEST

HINT:

The ECM controls the transmission based on the vehicle condition according to the table below.

Automatic Transmission Control

Vehicle Condition	Automatic Transmission Control Performed
Engine coolant temperature is below 60°C (140°F) Shift lever is in S and the S3, S2 or S1 range is selected Accelerator pedal is released Stop light switch is on	Lock-up prohibition control
ATF temperature is below 33°C (91°F), or is 110°C (230°F) or higher Stop light switch is on	Acceleration flex lock-up prohibition control
ATF temperature is below 20°C (68°F), or is 110°C (230°F) or higher	Deceleration flex lock-up prohibition control
ATF temperature is 130°C (266°F) or higher	Lock-up schedule is changed
Any of the shift solenoid valves malfunction Turbine speed sensor circuit failure CAN communication system failure ATF temperature sensor circuit failure KCS sensor circuit failure Vehicle speed sensor circuit failure	Shift change prohibition control
Engine coolant temperature is below 55°C (131°F) and the vehicle speed is less than 45 km/h (28 mph)	4th Gear Up-shift Prohibition Control
Engine coolant temperature is below 55°C (131°F) and the vehicle speed is less than 51 km/h (32 mph)	5th Gear Up-shift Prohibition Control

(a) D position test

(1) Check up-shift operation.

Check the 1 → 2, 2 → 3, 3 → 4 and 4 → 5 up-shifts.

(2) Check for shift shock and slippage.

Check for shock and slippage at the 1 → 2, 2 → 3, 3 → 4 and 4 → 5 up-shifts.

(3) Check for abnormal noise and vibration.

Check for abnormal noise and vibration when up-shifting from 1 → 2, 2 → 3, 3 → 4 and 4 → 5 while driving with the shift lever in D, and also check while driving in the lock-up condition.

HINT:

The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due to loss of balance in the differential, torque converter, etc.

(4) Check kick-down operation.

Check that the 2 → 1, 3 → 2, 4 → 3 and 5 → 4 kick-downs take place when accelerating with the shift lever in D.

(5) Check for abnormal shock and slippage at each kick-down.

(6) Check the lock-up mechanism.

Drive in 5th gear with the shift lever in D at a steady speed (lock-up ON).
Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

HINT:

If there is a sudden increase in engine speed, there is no lock-up.

(b) S position test

(1) Check shift operation.

While driving the vehicle in 5th gear with the shift lever in D, move the shift lever to S and return it to D. Check that the 5 → 4 down-shift and 4 → 5 up-shift can be performed.
With the shift lever in S (while the vehicle is stopped), move to "+" to check that the shift position on the combination meter changes as follows: 1 → 2, 2 → 3, 3 → 4 and 4 → 5.
While driving the vehicle in 5th gear with the S5 range selected (at a vehicle speed of approximately 55 to 65 km/h (34 to 40 mph)), move to "-" and check if the down-shift to 4th gear occurs and the engine brake operates properly.
While driving the vehicle in 4th gear with the S4 range selected (at a vehicle speed of approximately 30 to 40 km/h (19 to 25 mph)), move to "-" and check if the down-shift to 3rd gear occurs and the engine brake operates properly.
While driving the vehicle in 3rd gear with the S3 range selected (at a vehicle speed of approximately 20 to 30 km/h (12 to 19 mph)), move to "-" and check if the down-shift to 2nd gear occurs and the engine brake operates properly.
While driving the vehicle in 2nd gear with the S2 range selected (at a vehicle speed of approximately 10 to 20 km/h (6 to 12 mph)), move to "-" and check if the down-shift to 1st gear occurs and the engine brake operates properly.

HINT:

Manual shifting (S position) is prohibited under either of the following conditions:

Down-shifting that causes engine overrun.
The driver continuously down-shifts (down-shifting to 1st gear may not be performed).

Move the shift lever to R and lightly depress the accelerator pedal. Check that the vehicle moves backward without any abnormal noise or vibration.

CAUTION:

Before conducting this test, make sure that the test area is free from people and obstructions.

(d) P position test

Stop the vehicle on an incline (more than 5°). Then move the shift lever to P and release the parking brake. Check that the parking lock pawl holds the vehicle in place.

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