Driver Technique

The ISL Cruise Control feature works like the Cruise Control on your car. It gives you the freedom to take your foot off the pedal while maintaining vehicle speed.

Cruise Control Switches
Your vehicle will be equipped with two Cruise Control switches. The first is the ON/OFF and the second controls the SET, RESUME, ACCEL, and COAST functions. Note: OEMs have the flexibility of setting the second switch up as:

  • SET/COAST and RESUME/ACCEL 
  • SET/ACCEL and RESUME/COAST

Be sure to understand the way your Cruise Control switches are set up. For more information see OEM Vehicle Setup - Cruise Control Switch Settings.

The Cruise Control switches are also used to control the PTO feature. All Cruise Control operation must take place at vehicle speeds in excess of 30 MPH.
Bumping your cruise control switches means flipping the switch in the correct direction for SET or RESUME and immediately releasing the switch. If the switches are held for longer than half a second, the secondary option of ACCEL or COAST are performed.

How to use Cruise Control

To turn on your Cruise Control:

  • Flip the ON/OFF switch to ON.

  • Accelerate to your desired vehicle speed and switch to the set position.

To increase or decrease your cruising speed:

  • Bump the switch to increase (ACCEL)or decrease (COAST) your cruise speed. Each bump will increase or decrease your speed by 1 MPH.

  • Accelerate to your desired vehicle speed and switch to the set position.

To stop using cruise control:

  • Press the brake pedal, or

  • Press the clutch pedal (see Cruise Control AutoResume Feature), or

  • Flip the ON/OFF switch to OFF.

To resume using Cruise Control:

  • Be sure the ON/OFF switch is ON.

  • Bump the RESUME switch.

The Cruise Control Maximum Vehicle Speed parameter allows the vehicle owner to limit vehicle speed while the Cruise Control feature is activated. The speed chosen must be between 30 and 102 mph.

Setting the Cruise Control Maximum Vehicle Speed slightly higher than the Accelerator Maximum Vehicle Speed provides an incentive for drivers to operate in Cruise Control. This can have a positive effect on fuel consumption.

It is also possible for the Cruise Control Maximum Vehicle Speed to be set slightly lower than the Accelerator Maximum Vehicle Speed. This will allow a little reserve speed for passing situations that require the use of the accelerator pedal.

The Cruise Control and Road Speed Governors are designed alike. They both have maximum vehicle speed and droop parameters. These parameters can be tailored to provide the desired combination of performance, economy, and speed control.

The Upper Droop controls fueling as you drive up a grade or accelerate and the Lower Droop controls fueling as you drive down a grade.

If the Cruise Control and Road Speed Governor Droop parameters are setup differently, the vehicle will perform differently while using cruise. If the vehicle performs better with cruise off, the cruise speed settings and/or droops may be setup to take advantage of fuel economy and speed control.

The Cruise Control AutoResume feature allows the engine to resume "cruising" after a clutched gear change is made. It is important to remember that when this feature is active, tapping the clutch pedal will still disengage Cruise Control. The control system can differentiate between tapping and a normal clutched gear change. Cruise will only resume if the engine is sure the operator used the clutch for shifting purposes. As always, tapping the brake or turning cruise off will also disengage the feature.

If you downshift in Cruise Control and the Gear Down Protection feature is enabled, your engine will only attempt to reach the programmed gear-down speed and not your original cruising set speed.

The Cruise Control Automatic Engine Brake Feature engages the Engine Brake at a programmable speed above Cruise Control Maximum Vehicle Speed. This allows for better speed control and can reduce vehicle brake system wear. The engine brake Switch must be ON for this feature to work correctly.