Lexus RX (RX 350L, RX450h) 2016-2024 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.
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(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) |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communic ...
Hydraulic Test
HYDRAULIC TEST PERFORM HYDRAULIC TEST (a) Measure the line pressure. CAUTION: A line pressure test should always be carried out with at least 2 people. One person should observe the condition of wheel ...
Other materials:
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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