Operation

OPERATION
The PCM will command the cruise control module to control the throttle when the following conditions are true:
1. The cruise system is enabled.
2. The vehicle speed is greater than 40 km/h (25 mph).
3. The RESUME/ACCEL or SET/COAST switches have been depressed for a minimum period of 0.06 seconds.
4. The cruise control cannot be engaged with the resume/accel switch until the set/coast has been used to make the initial set.
5. The brake pedal is not depressed.
6. The clutch is fully engaged (manual transmission only).

IMPORTANT: On auto transaxle equipped vehicles, the PCM will not allow cruise operation until a brake switch transition is seen.

CRUISE CONTROL DISENGAGE
An engaged cruise control system will be disengaged when any of the following are true:
1. The cruise system is disabled.
2. Vehicle road speed drops below 40 km/h (25 mph).
3. Brake and/or clutch is depressed.
4. Vehicle begins to decelerate faster than 6 km/h (4.0 mph) per second.
5. Wheels begin to accelerate faster than 16 km/h (10 mph) per second.

CRUISE CONTROL SWITCH FUNCTIONS

SET/COAST SWITCH
The SET/COAST switch has several functions:
1. When cruise is enabled, pressing the SET/COAST switch will engage cruise. The switch must be pressed for a period greater than 0.06 seconds but less than one second.
2. When cruise is engaged, holding the SET/COAST switch depressed will allow the vehicle to coast down to a new, lower cruise speed. The switch must be pressed for a period greater than 0.4 seconds.
3. When cruise is engaged, tapping the SET/COAST switch will cause the cruise set speed to be lowered in increments of one mile per hour for each momentary press of the SET/COAST switch. This is the TAP DOWN feature. The switch must be pressed for a period greater than 0.06 seconds but less than 1.4 seconds.

RESUME/ACCEL SWITCH
The RESUME/ACCEL switch has several functions:
1. If the vehicle has been in cruise engaged mode, and cruise has been disabled by pressing the brake and/or clutch pedals, the vehicle can be returned to the original set speed by pressing the Resume/Accel button one time. The switch must be pressed for a period greater than 0.06 seconds but less than one second.
2. Holding the RESUME/ACCEL switch in the accelerate position will cause the vehicle to accelerate until the switch is released, resulting in new cruise speed. The switch must be pressed for a period greater than 1.4 seconds.
3. When cruise is engaged, tapping the RESUME/ACCEL switch will cause the cruise set speed to be raised in increments of 2 km/h (1 mph) for each momentary press of the RESUME/ACCEL switch. This is the TAP UP feature. The switch must be pressed for a period greater than 0.06 seconds, but less than 1.4 seconds.

SWITCH DEBOUNCE
Once the SET/COAST ON/OFF or the RESUME/ ACCEL switch is pressed, it must remain pressed at least 0.06 seconds to be considered a valid switch closure.

TAP UP AND TAP DOWN CRUISE SET SPEED ADJUSTMENT
The desired set speed can be adjusted UP and DOWN in 2 km/h (1 mph) increments after (and while) cruise is engaged. The system will limit the number of TAP UP requests to a differential of 10 mph from the previously recognized set speed.

TAP UP FEATURE
The desired set speed is adjusted UP by momentarily depressing the RESUME/ACCEL switch. This is the TAP UP feature. To be considered a valid TAP UP request, the RESUME/ACCEL switch must be pressed between 0.06 and 1 second. Pressing the RESUME/ ACCEL switch longer than 0.7 seconds will be considered an accelerate command. Each press of the RESUME/ ACCEL switch (which is determined to be a valid TAP UP request) will cause the desired set speed to be increased by one mile per hour. Holding the R/A longer than 1.4 seconds results in a new set speed upon release of the button.

PAGE No: PCMD-347

TAP DOWN FEATURE
The desired set speed is adjusted DOWN by momentarily depressing the SET/COAST switch. This is the TAP DOWN FEATURE. To be considered a valid TAP DOWN request, the SET/COAST switch must be pressed between 0.06 and 1 second. Each press of the SET/COAST switch (which is determined to be a valid TAP DOWN request) will cause the desired set speed to be decreased by 2 km/h (1 mph).

TAP DOWN LOWER SPEED LIMIT
When issuing repeated TAPS DOWN requests, the cruise set speed is limited to 40 km/h (25 mph), and cannot be Tapped Down below that limit.

COMBINATION TAPS UP AND TAPS DOWN RESOLUTION
When the driver issues a combination of TAPS UP and TAPS DOWN requests, the cruise set speed is adjusted according to the total sum of the TAPS UP and TAPS DOWN requested. For example, if the driver TAPS UP five times, then TAPS DOWN once, the speed will increase by 6 km/h (4 mph).