Road Test

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION

HINT
The dynamic radar cruise control system has two cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.

* Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control switch (ON-OFF button).
* Operation of constant speed control mode is the same as that for a conventional cruise control system.

(a) Inspect the SET function.

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(1) Turn the cruise control system on using the cruise control switch (ON-OFF button).

(2) Check that the cruise control indicator light illuminates in green on the combination meter sub-assembly.

(3) Drive at a speed between 50 km/h (30 mph) and 170 km/h (105 mph).

(4) Push the cruise control switch to -/SET.

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(5) Check that the cruise control indicator remains illuminated, the cruise control SET indicator illuminates and the set speed is displayed in the cruise control part of the combination meter.

(6) After releasing the switch, check that the vehicle maintains the set speed.

(b) Inspect the + (ACCEL) function.

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(1) Turn the cruise control system on using the cruise control switch (ON-OFF button).

(2) Drive at a speed between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

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

(5) Push the cruise control switch to +/RES and then release it immediately. Check that the vehicle speed increases* (tap-up control).

HINT
*: Constant speed control mode: increases by approximately 1.6 km/h (1 mph); vehicle-to-vehicle distance control mode: increases by approximately 1 km/h (1 mph).

(c) Inspect the - (COAST) function.

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(1) Turn the cruise control system on using the cruise control switch (ON-OFF button).

(2) Drive at a speed between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

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

(5) Push the cruise control switch to -/SET, and then release it immediately. Check that the vehicle speed decreases* (tap-down control).

HINT
*: Constant speed control mode: decreases by approximately 1.6 km/h (1 mph); vehicle-to-vehicle distance control mode: decreases by approximately 1 km/h (1 mph).

(d) Inspect the CANCEL function.

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(1) Turn the cruise control system on using the cruise control switch (ON-OFF button).

(2) Drive at a speed between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

(4) When any of the following are performed, check that cruise control system control of vehicle speed is canceled and that the normal driving mode (no control of vehicle speed by the cruise control system) resumes.

* Depressing the brake pedal

* Moving the shift lever from D to any other position

* Pulling the cruise control switch to CANCEL

* Turning the cruise control system off using the cruise control switch (ON-OFF button). The stored vehicle speed in the driving support ECU assembly is not maintained.

(e) Inspect the RES (RESUME) function.

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(1) Turn the cruise control system on using the cruise control switch (ON-OFF button).

(2) Drive at a speed between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

(4) Cancel the cruise control system control of vehicle speed by performing any of the above operations (other than turning the cruise control system off using the ON-OFF switch).

(5) After pushing the cruise control switch to +/RES at a speed of more than approximately 40 km/h (25 mph), check that the vehicle resumes the speed set prior to cancellation and that the cruise control SET indicator light comes on.

HINT
The stored vehicle speed is retained even if vehicle speed drops below approximately 40 km/h (25 mph). The previously stored vehicle speed can be resumed by pushing the cruise control switch to +/RES when the vehicle speed has returned to approximately 40 km/h (25 mph) or more.