Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Road Test

ROAD TEST

PROBLEM SYMPTOM CONFIRMATION

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

ROAD TEST

CAUTION:

Strictly observe posted speed limits, traffic laws and road conditions when performing the road test.

NOTICE:

  • Be sure to inspect and adjust the engine before performing these tests.
  • Perform the road test with the engine coolant temperature between 60 and 100°C (140 and 212°F) and the ATF temperature between 50 and 100°C (122 and 212°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 M and return it to D. Check that the meter display changes from D to the appropriate M gear and then back again.

    M Position Test

    While driving with the shift lever in M, move the shift lever to "+" and "-". Check that the meter display changes accordingly.

    D Position Shift Test

    While driving the vehicle normally, check that the transaxle 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.

Click here

(a) Shift schedule confirmation

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Enter the following menus: Powertrain / Engine / Data List.

Powertrain > Engine > Data List

Tester Display

Vehicle Speed

Coolant Temperature

Throttle Sensor Position

Shift Status

(4) Check that the "Shift Status" changes in accordance with the "Vehicle Speed" as shown in the following table.

Shift Schedule Chart:

Throttle Sensor Position

6%

Shift Status

(Shift Lever in D)

1st to 2nd

2nd to 3rd

3rd to 4th

4th to 5th

5th to 6th

6th to 7th

7th to 8th

Vehicle Speed

5 to 15 km/h

(3 to 9 mph)

15 to 25 km/h

(9 to 16 mph)

25 to 35 km/h

(16 to 22 mph)

30 to 40 km/h

(19 to 25 mph)

40 to 50 km/h

(25 to 31 mph)

65 to 75 km/h

(40 to 47 mph)

75 to 80 km/h

(47 to 50 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 tester indication.

(b) Lock-up confirmation

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Enter the following menus: Powertrain / Engine / Data List.

Powertrain > Engine > Data List

Tester Display

Vehicle Speed

Engine Speed

Coolant Temperature

Throttle Sensor Position

NT Sensor Speed

A/T Oil Temperature No.1

Lock Up Status

Shift Status

(4) 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

Throttle Sensor Position

6%

Vehicle Speed

80 km/h (50 mph) or more

Shift Status

8th gear

Lock Up Status

ON

HINT:

Lock-up prohibition conditions:

  • A/T oil temperature is less than 5°C (41°F)
  • Engine coolant temperature is less than 60°C (140°F)
  • S1, S2, M1 or M2 is selected
  • Throttle valve is fully closed
  • Stop light switch is on

(c) 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 M)

8 to 7

7 to 6

6 to 5

5 to 4

4 to 3

3 to 2

2 to 1

Vehicle Speed

295 to 305 km/h

(183 to 190 mph)

240 to 250 km/h

(149 to 155 mph)

195 to 205 km/h

(121 to 127 mph)

160 to 170 km/h

(99 to 106 mph)

130 to 140 km/h

(81 to 87 mph)

80 to 95 km/h

(50 to 59 mph)

25 to 35 km/h

(16 to 22 mph)

(d) Shift schedule when throttle valve is fully open

Shift Schedule Chart:

Throttle Opening Angle

Fully Open

Shift Status

(Shift Lever in D)

1st to 2nd

2nd to 3rd

3rd to 4th

4th to 5th

5th to 6th

6th to 7th

7th to 8th

Vehicle Speed

45 to 55 km/h

(28 to 34 mph)

80 to 90 km/h

(50 to 56 mph)

125 to 140 km/h

(78 to 87 mph)

160 to 175 km/h

(99 to 109 mph)

195 to 205 km/h

(121 to 127 mph)

245 to 255 km/h

(152 to 158 mph)

305 to 310 km/h

(190 to 193 mph)

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