Toyota Tacoma manuals

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 (b) Shift schedule confirmation ).

(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
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