Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL
CRUISE CONTROL SYSTEM (for 2AD-FHV) - SYSTEM DESCRIPTION
| CRUISE CONTROL SYSTEM |
The cruise control system makes it possible to drive at a desired speed without using the accelerator pedal. The ECM controls the fuel injection volume based on signals from switches and sensors. A microcomputer, which controls the cruise control system, is built into the ECM, and changes the fuel injection volume.
Constant speed control is ready to operate when the cruise control main switch ON-OFF button is pushed (the CRUISE main indicator light comes on).
Operating the cruise control main switch, the driver can control the following functions.
| LIMIT CONTROL |
Low speed limit
The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. Cruise control operation will be automatically canceled and the stored vehicle speed will be erased when the vehicle speed goes below the low speed limit while the cruise control is in operation.
High speed limit
The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, + (ACCEL)/RES (RESUME) cannot be used to increase speed beyond the high speed limit.
| OPERATION OF CRUISE CONTROL |
The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it.
SET CONTROL
Vehicle speed is stored and constant speed control is maintained when pushing the cruise control main switch to - (COAST)/SET while driving with the main switch on (the CRUISE main indicator light is on), and the vehicle speed is within the set speed range (between the low and high speed limits).
- (COAST) CONTROL
A cruise set speed decreases while pushing down on the cruise control main switch to - (COAST)/SET. The vehicle cruises at the newly set speed when releasing the cruise control main switch.
TAP-DOWN CONTROL
When tapping down the cruise control main switch to - (COAST)/SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). When the cruise control main switch is released from - (COAST)/SET and the difference between the driving and stored vehicle speed is more than 5 km/h (3 mph), the driving vehicle speed is stored and constant speed control is maintained.
ACCELERATION CONTROL
A cruise set speed increases while pushing up on the cruise control main switch to + (ACCEL)/RES (RESUME). The vehicle cruises at the newly set speed when releasing the cruise control main switch.
TAP-UP CONTROL
When tapping up the cruise control main switch to + (ACCEL)/RES (RESUME) (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than 5 km/h (approximately 3.1 mph), the stored vehicle speed will not be changed.
RESUME CONTROL
If cruise control operation was canceled with the stop light switch or the CANCEL switch, and if driving speed is within the limit range, pushing the cruise control main switch to + (ACCEL)/RES (RESUME) restores vehicle speed memorized at the time of cancellation, and maintains constant speed control.
MANUAL CANCEL CONTROL
Performing any of the following cancels the cruise control system while in operation (the stored vehicle speed in the ECM is maintained).
| AUTO CANCEL (FAIL-SAFE) |
This system has an automatic cancellation function (fail-safe) .