W 3500 L4-5.2L DSL Turbo (2006)
Cruise Control: Testing and Inspection
Cruise Control System Check
Description
The cruise control system consists of the engine control module (ECM), the cruise main switch, set/coast switch and resume/accel. switch. The cruise
control keeps the vehicle running at a fixed speed without pressing the accelerator pedal. The vehicle speed is increased or decreased if the set/coast
switch or the resume/accel. switch is pushed.
Cruise Control Operation
Conditions for running the cruise control:
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The vehicle speed is between 30 MPH (48 km/h) and75MPH(121 km/h).
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The engine coolant temperature is more than 68 °F (20 °C).
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The cruise main switch is ON.
Conditions for canceling the cruise control:
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When the brake pedal is depressed.
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When the clutch pedal is depressed (MT) or when the transmission gear position is shifted to the "N" or "1st" position (A/T).
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The vehicle speed becomes approximately 25 MPH (40 km/h) or lower.
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The cruise main switch is turned OFF.
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The ignition switch is turned OFF.
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The DTCs relating to the cruise control system are set.
1. Function of "SET"
If the set/coast switch is pressed and released while conditions for running the cruise control are satisfied, the ECM memorizes and maintains the
vehicle speed at the time.
2. Function of "COAST"
If the set/coast switch is pressed while the cruise control system is operating, the vehicle speed is decreased. Then, when the set/coast switch is
released, the vehicle will maintain the vehicle speed at that time.
3. Function of "RESUME"
If the resume/accel. switch is pressed while the cruise control system is operating and the ECM memorizes the vehicle speed, the vehicle speed is
returned to the vehicle speed memorized by the ECM.
4. Function of "ACCEL"
If the resume/accel. switch is pressed while the cruise control system is operating, the vehicle speed is increased. Then, when the resume/accel.
switch is released, the vehicle will maintain the vehicle speed at that time.
5. Function of "TAP UP"
If the resume/accel. switch is tapped while the cruise control system is operating, the vehicle speed is increased 1 MPH (1.6 km/h) at a time. The
function is possible to operate 10 times continuously until vehicle speed is increased to 75 MPH (120 km/h).
6. Function of "TAP DOWN"
If the set/coast switch is tapped while the cruise control system is operating, the vehicle speed is decreased 1 MPH (1.6 km/h) at a time. The
function is possible to operate 10 times continuously until the vehicle speed is decreased to 30 MPH (48 km/h).
7. Function of Temporary Acceleration
If the accelerator pedal is pressed while the cruise control system is operating, the vehicle speed is increased.
8. Function of Temporary Cancellation
The cruise control is canceled temporarily if the following condition is satisfied:
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The brake pedal is pressed.
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The clutch pedal is pressed (M/T).
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The transmission gear position is not 2nd, 3rd, or 4th (A/T).
Diagnostic Aids
NOTE: The operational speed range of the cruise control system can change by request of a user within the following allowable range.
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Maximum cruise control speed limit is lower than 75 MPH (121 km/h).
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Minimum cruise control speed limit is higher than 25 MPH (40 km/h).
Refer to the Cruise Control Option Programming for ECM programming. See: Service and Repair
