Toyota Tacoma (2015-2018) Service Manual: 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 down, or that the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and attempt to duplicate the problem symptoms.
2. ROAD TEST
(a) Perform a road test.
CAUTION:
Check for safety before performing any tests.
NOTICE:
- Be sure to inspect and adjust the engine before performing these tests.
- Perform the road test with the engine coolant temperature is 70°C (158°F) or higher and the ATF temperature between 40 and 110°C (104 and 230°F).
- Perform these tests with the air conditioning and cruise control off.
|
Inspection |
Procedure |
|---|---|
|
Transmission Control Switch Test |
With the vehicle stationary and the shift lever in D, move the shift lever to S and return it to D. Check that the meter display changes from D to the appropriate S range and then back again. |
|
S Position Test |
With the vehicle stationary and the shift lever in S, move the shift lever to "+" and "-". Check that the meter display changes between S ranges properly. |
|
D Position Shift Test |
While driving the vehicle normally, check that the transmission shifts up and down through each gear properly. |
|
Lock-up Function |
While driving on a level surface at a constant speed in the lock-up range with the shift lever in D, lightly depress the accelerator pedal and check that the engine speed does not change abruptly. |
|
P Position Test |
Stop the vehicle on an incline (approximately 5° or more). Then move the shift lever to P and release the parking brake. Check that the parking lock pawl holds the vehicle in place. |
|
Abnormal Noise and Vibration |
Check for abnormal noise and vibration while driving the vehicle forward and backward, and during shift operations. |
|
Fluid Leakage |
After performing all other road test inspections, check for fluid leakage. |
HINT:
When checking for DTCs after a repair, drive the vehicle according to the monitor
drive pattern (See page .gif)
).
(b) Shift schedule confirmation
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Transmission / Data List / Vehicle Speed, Accel Position from EFI and Shift Status.
(5) Check that the "Shift Status" changes in accordance with the "Vehicle Speed" as shown in the following table.
Shift Schedule Chart|
Accelerator Position |
6% |
||||
|---|---|---|---|---|---|
|
Shift Status (Shift Lever in D) |
1st to 2nd |
2nd to 3rd |
3rd to 4th |
4th to 5th |
5th to 6th |
|
Vehicle Speed |
10 to 15 km/h (6 to 9 mph) |
20 to 30 km/h (12 to 19 mph) |
30 to 40 km/h (19 to 25 mph) |
45 to 55 km/h (28 to 34 mph) |
60 to 75 km/h (37 to 47 mph) |
NOTICE:
- All vehicle speeds indicated in the above table are actual values. Therefore, if checking a shift point with a chassis dynamometer, keep in mind that there is a margin of error in the chassis dynamometer indication.
- If checking a shift point against the vehicle speed indicated on the speedometer, remember to consider the speedometer correction rate and margin of error in the Techstream indication.
(c) Lock-up confirmation
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Transmission / Data List / Vehicle Speed, Engine Speed, Accel Position from EFI, NT Sensor Speed, A/T Oil Temperature 1, Lock Up Status and Shift Status.
(5) When the following conditions are met, check that the difference between "Engine Speed" and "NT Sensor Speed" is 50 rpm or less.
Lock-up Schedule|
Accel Position from EFI |
6% |
|
Vehicle Speed |
80 km/h (50 mph) or more |
|
Shift Status |
6th gear |
|
Lock Up Status |
ON |
HINT:
Lock-up prohibition conditions:
- A/T oil temperature is below 40°C (104°F)
- Engine coolant temperature is below 70°C (158°F)
- Shift range between "1" (S1 range) and "3" (S3 range)
- Accelerator pedal is fully released
- Stop light switch signal is on
(d) Manual down-shift permission speed
(1) Manual down-shift is permitted for each shift status when the vehicle speed is below the corresponding range shown in the following table.
Manual Down-shift Permission Speed Chart|
Shift Status (Shift Lever in S) |
S6 to S5 |
S5 to S4 |
S4 to S3 |
S3 to S2 |
S2 to S1 |
|---|---|---|---|---|---|
|
Vehicle Speed |
280 to 305 km/h (174 to 190 mph) |
190 to 210 km/h (118 to 130 mph) |
125 to 145 km/h (78 to 90 mph) |
90 to 100 km/h (56 to 62 mph) |
40 to 50 km/h (25 to 31 mph) |
(e) Shift schedule when accelerator pedal is fully depressed
Shift Schedule Chart|
Accelerator Pedal |
Fully Depressed |
||||
|---|---|---|---|---|---|
|
Shift Status (Shift Lever in D) |
1st to 2nd |
2nd to 3rd |
3rd to 4th |
4th to 5th |
5th to 6th |
|
Vehicle Speed |
45 to 55 km/h (28 to 34 mph) |
90 to 105 km/h (56 to 65 mph) |
130 to 150 km/h (81 to 93 mph) |
210 to 230 km/h (130 to 143 mph) |
305 to 330 km/h (190 to 205 mph) |
Mechanical System Tests
MECHANICAL SYSTEM TESTS
1. STALL SPEED TEST
HINT:
This test is to check the overall performance of the engine and transmission.
CAUTION:
This test should be done on a paved surface (a sur ...
Initialization
INITIALIZATION
1. RESET MEMORY
NOTICE:
Perform Reset Memory (AT initialization) when replacing the automatic
transmission assembly, transmission valve body assembly or any of the shift ...
Other materials:
Operation Check
OPERATION CHECK
1. CHECK WINDOW LOCK SWITCH
HINT:
Before performing the window lock switch operation check, make sure that the
window lock switch is off (the switch is not pushed in).
(a) Check that the front passenger and rear windows cannot be operated from each
power window regulator swit ...
Precaution
PRECAUTION
1. PRECAUTIONS FOR REFRIGERANT HFO-1234yf (R1234yf)
(a) Compatibility
(1) The parts used in the refrigerant cycle, the compressor oil, etc. of the
HFO-1234yf (R1234yf) system are not compatible with the conventional HFC-134a (R134a)
system.
(b) HFO-1234yf (R1234yf) Refrigerant
(1 ...
Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3) (P0798)
DESCRIPTION
Changing from 1st to 6th is performed by the ECM turning shift solenoid valves
SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valves
to allow the vehicle to be operated ...
