HOUSING 8P8780 - Caterpillar

Probable Causes
The probable root causes are listed below:
Customer specified parameters (normal operation)
Cruise control pause switch
On/Off switch for cruise control and idle control
PTO on/off switch
Set/resume switch
Circuit for service brake switch
Transmission neutral switch circuit
Clutch switch circuit
Vehicle speed circuit
Adaptive cruise controlRecommended Actions
Perform the following diagnostic procedures in order:
When the cruise control or the idle control is set with the cruise control on/off switch, use the Caterpillar Electronic Technician (ET) in order to check the Configuration. Check the following parameters:
"Low Cruise Control Set Speed Limit"
"High Cruise Control Set Speed Limit"
"Idle Vehicle Speed Limit"
"Idle rpm Limit"Note: If the vehicle speed exceeds the "High Cruise Control Set Speed Limit" and the driver attempts to set a cruise control speed, the cruise set speed will be the "High Cruise Control Set Speed Limit". If the vehicle speed is below the "Low Cruise Control Set Speed Limit", the cruise control can not be set or resumed. If the engine rpm is above the idle rpm limit and the driver attempts to set an idle engine rpm the idle engine rpm will be the Idle rpm Limit. If the driver attempts to set an Idle engine rpm and the vehicle speed exceeds the Idle Vehicle Speed Limit, the Idle will not activate. Refer to Troubleshooting, "Cruise Control Switch Circuit - Test".
Connect Cat ET to the data link connector. Check the status screen for the following kickouts:
Cruise KickoutIf the cruise control pause switch was the cause of the last kickout, the cruise control pause switch may be preventing normal operation of the cruise control.
Check the position of the cruise control pause switch. If the switch is in the ON position, the switch will prevent normal operation of the cruise control. Change the switch to the OFF position. Verify that the repair eliminates the problem.
If the cruise control pause switch is in the OFF position and the switch is still causing the cruise kickout, the switch is bad or the wiring is shorted.
Check the switch for proper operation. If the switch is bad, replace the switch. If the switch is working, the wiring is probably shorted. Refer to Troubleshooting, "Electrical Connectors - Inspect".
When the PTO is set with a dedicated PTO On/Off switch, use Cat ET to check the Configuration. Check the following parameters:
"PTO Configuration"
"PTO Vehicle Speed Limit"
"PTO Top Engine Limit"
"PTO Cab Controls RPM Limit"Refer to Troubleshooting, "PTO Switch Circuit - Test" for additional information.
Connect Cat ET to the data link connector. Check the status screen for the following controls:
On/Off switch for cruise control and idle control
PTO on/off switch
Set/Resume switch
Circuit for service brake switch
Transmission neutral switch
Clutch switch
Vehicle speed
Turn on the on/off switch for cruise control and idle control while the status screen on Cat ET