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Home >> Lexus >> 2010 >> IS 250 AWD V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Cruise Control >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Cruise Control System >> Road Test
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Road Test





CRUISE CONTROL: CRUISE CONTROL SYSTEM: ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION

(a) Inspect the SET function.





(1) Turn the cruise control main switch on.

(2) Drive at a speed between 40 km/h (25 mph) and 200 km/h (125 mph).

(3) Push the cruise control main switch to - (COAST)/SET.

(4) After releasing the switch, check that the vehicle cruises at the set speed.

(b) Inspect the ACCELERATION function.





(1) Turn the cruise control main switch on.

(2) Drive at a speed between 40 km/h (25 mph) and 200 km/h (125 mph).

(3) Push the cruise control main switch to - (COAST)/SET.

(4) Check that vehicle speed increases while the cruise control main switch is pushed to + (ACCEL)/RES (RESUME), and that the vehicle cruises at the newly set speed when the switch is released.

(5) Push the cruise control main switch to + (ACCEL)/RES (RESUME) and then release it immediately. Check that vehicle speed increases by approximately 1.6 km/h (1 mph) (tap-up control).

(c) Inspect the - (COAST) function.





(1) Turn the cruise control main switch on.

(2) Drive at a speed between 40 km/h (25 mph) and 200 km/h (125 mph).

(3) Push the cruise control main switch to - (COAST)/SET.

(4) Check that vehicle speed decreases while the cruise control main switch is pushed to - (COAST)/SET, and the vehicle cruises at the newly set speed when the switch is released.

(5) Push the cruise control main switch to - (COAST)/SET, and then release it immediately. Check that vehicle speed decreases by approximately 1.6 km/h (1 mph) (tap-down control).

(d) Inspect the CANCEL function.





(1) Turn the cruise control main switch on.

(2) Drive at a speed between 40 km/h (25 mph) and 200 km/h (125 mph).

(3) Push the cruise control main switch to - (COAST)/SET.

(4) When performing any one of the following, check that the cruise control system is canceled and that the normal driving mode is reset.

* Depressing the brake pedal

* Depressing the clutch pedal (for Manual Transaxle)

* Moving the shift lever from the D to the N position or selecting the 3rd, 2nd, or 1st range with the shift lever in the S position (for Automatic Transaxle)

* Selecting the 3rd, 2nd, or 1st range with the shift paddle switch (for Automatic Transaxle)

* Turning the cruise control main switch off

* Pulling the cruise control main switch to CANCEL

(e) Inspect the RES (RESUME) function.





(1) Turn the cruise control main switch on.

(2) Drive at a speed between 40 km/h (25 mph) and 200 km/h (125 mph).

(3) Push the cruise control main switch to - (COAST)/SET.

(4) Cancel the cruise control system by performing any of the above operations (other than turning the main switch off).

(5) After pushing the cruise control main switch to + (ACCEL)/RES (RESUME) at a driving speed of more than 40 km/h (25 mph), check that the vehicle resumes the speed set prior to the cancellation.
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