The cruise control on my Grand Am seems to be malfunctioning. I can set the cruise control at a certain speed, but it seems to go off after about a minute or so. Also, I cannot seem to get it set at certain speeds. Any idea what the first steps might be in diagnosing this problem? Thanks in advance!
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Cruise Control on your vehicle is computer controlled , having the vehicle checked for DTC'S - diagnostic trouble codes should be the first step in diagnosing this problem . Not a code reader or autozone etc... Would need a factory Tech 2 scanner or someother professional type , one that can read BCM - body control module codes .
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the Cruise Control System:
• The accelerator pedal
• The brake pedal position (BPP) sensor
• The body control module (BCM)
• The cruise control on/off switch
• The powertrain control module (PCM)
• The + RES switch
The + RES switch is the equivalent to an accel/resume switch.
• The - SET switch
The - SET switch is the equivalent to a set/coast switch.
• The throttle actuator control (TAC) module
• The TAC motor
• The vehicle speed sensor (VSS)
It's probably a problem with cruise control module , located under the hood in engine compartment . Or a bad connection somewhere . Do you know how to do electrical testing ? Is the air bag light lit on the instrument cluster ?
Could have DTC'S - diagnostic trouble code's stored .
The powertrain control module (PCM) inhibits cruise control operation when certain conditions are not appropriate for cruise control operation. The PCM removes the ground from the cruise control inhibit signal circuit in order to disengage cruise control operation.
Output driver modules (ODMs) are used by the powertrain control module (PCM) in order to turn on many of the current driven devices that are needed to control various engine and transaxle functions. DTC P1558 set indicates that an improper voltage level has been detected on the signal circuit which controls the cruise control inhibit circuit.
Action Taken When the DTC Sets
• The PCM will not illuminate the malfunction indicator lamp (MIL).
• The PCM will store the conditions present when the DTC set as Failure Records data only.
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades may cause variations in the selected speeds. The electronic cruise control system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and TAP-UP or TAP-DOWN.
The main parts of the cruise control system are:
• The cruise control module assembly
• The function control switches
• The cruise control release switch
• The clutch pedal position switch (CPP), if equipped
• The stop lamp switch assembly
• The vehicle speed sensor
The cruise control system uses the cruise control module assembly to maintain the desired vehicle cruise speed and operation. The cruise control module assembly has an electronic controller and an electric stepper motor to vary the throttle in each different cruise control mode. The electric controller monitors vehicle speed and operates the electric stepper motor. The stepper motor operates in response to the electronic controller, to maintain the desired cruise speed. The electric stepper motor moves a strap that is attached to the cruise control cable which moves the throttle linkage. The cruise control module assembly contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph). The module assembly is not serviceable.
The cruise control switches are located on the steering wheel. When the cruise control is turned on there will be a green light luminated on the dash that says "cruise". When at the desired speed press "set" to set the cruise control at that speed.
P0582 is the Chrysler Diagnostic Trouble Code (Error Code) for:
Speed control vacuum or vent solenoid circuits open or shorted
If you do not have cruise control on your vehicle, you can ignore this code. If you do, you've probably noticed it is no longer working or only works intermittently. The code is saying it's an electrical problem to the servo.
Depending on the speed, there might not be a problem. All the cars that I have owned do not allow you to set the cruise control below about 35 mph. If its at a higher speed then I am not sure what the problem is and you can take it to most car repair shops to get it fixed. As far as I know there is not a high speed limit to set a cruise control (I have set them at 90mph).