Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Monitor Drive Pattern

MONITOR DRIVE PATTERN

MONITOR DRIVE PATTERN FOR ECT

CAUTION:

Perform the following procedure on a level surface while strictly observing all traffic laws and speed limits.

HINT:

Performing this drive pattern is one method to simulate ECM (ECT) malfunction detection conditions. Some DTCs may not be detected through ordinary, everyday driving. Also, some DTCs may not be detected through this drive pattern.

(a) Preparation for driving

(1) Warm up the engine sufficiently (engine coolant temperature of 60°C (140°F) or higher).

(2) Drive the vehicle when the ambient temperature is -10°C (14°F) or higher.

Some malfunctions are not detected when the ambient temperature is less than -10°C (14°F).

(b) Drive pattern

*: Drive at a speed in the highest gear that will cause lock-up to engage. The vehicle can be driven at a speed lower than the speed shown in the above diagram under lock-up.

(1) Drive the vehicle through all of the gears.

Stop → 1st → 2nd → 3rd → 4th → 5th → 6th → 7th → 8th → 8th (lock-up ON).

HINT:

Lock-up will be engaged while driving in 3rd gear or higher.

(2) Perform an engine braking test with the shift lever in M. While driving in M8 with 8th gear lock-up, move the shift lever to "-" and down-shift from 8th → 7th, 7th → 6th, 6th → 5th, 5th → 4th, 4th → 3rd, 3rd → 2nd and 2nd → 1st.

Check that engine braking is normal for every down-shift.

(3) Repeat the above drive pattern 3 times or more.