Driver Controls Set/Decelerate/Resume/Accelerate Switch The set/decelerate/resume/accelerate switch can only be used when cruise control has been activated. See Fig. 4.14 . M Press the upper half of the switch momentarily to set the cruise speed (with the engine running at the de- sired speed). Press and hold the upper half of the switch to decelerate slowly. Release the switch when the desired speed is reached. ENGINE BRAKE HIGH MED LOW Press the lower half of the switch momentarily to re- sume the previously set cruise speed. Press the lower half of the switch and hold to accelerate slowly. Release the switch when the desired speed is achieved. 07/15/2011 f545791 1. Engine Brake On/Off 2.
Engine Brake Intensity Switch NOTICE Fig. 4.15, Engine Brake Switches When the cruise control is engaged, do not at- tempt to shift gears without using the clutch pedal. Failure to follow this precaution will result in a temporarily uncontrolled increase in engine speed. Transmission damage and gear stripping could result. Engine Diagnostic Switch (EPA07 vehicles) The engine diagnostic switch is used to signal the engine ECM to flash codes on the indicator light. Press the upper half of the switch once to activate it. See Fig. 4.16 . Engine Brake Switches NOTE: See Chapter 10 for detailed information about engine brake operation.
Whenever vehicle braking is required on good road conditions, the engine brake may be used in con- junction with the service brakes. There is no time limit for operation of the engine brake. However, an engine brake does not provide the precise control of, and is not a substitute for, service brakes. ENGINE DIAGN Two dash-mounted switches control the engine brake: The ENGINE BRAKE switch is used to turn the engine brake on and off. See Fig. 4.15 . 08/22/2011 f545819 The HIGH/MED/LOW engine brake intensity switch (HIGH/LOW in some cases) controls the amount of engine braking. When the engine brake is on, the status bar illuminates, indicat- ing the current intensity setting. Fig.
4.16, Engine Diagnostic Switch Engine Fan Switch Press the upper half of the engine fan switch to over- ride the automatic fan control and cause the engine fan to run continuously. See Fig. 4.17 . This switch is intended for temporary use, or if the automatic fan control fails. Press the lower half of the switch to re- turn to automatic fan control. 4.8