BUSHING 5I7528 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure to determine if the neutral switch is preventing normal operation of cruise control, fast idle, idle set speed, or PTO operation:The following switch circuits can also prevent the correct operation of the cruise control, fast idle, idle set speed or PTO operation:
Service brake pedal position (switch 1)
Service brake pedal position (switch 2)
Neutral switch
Cruise control set/resume switch
Cruise control on/off switch
PTO on/off switch
cruise control pause switchThe switches are described in the respective circuit tests in Troubleshooting.All of the following Customer Programmable Parameters can affect cruise control, fast idle, idle set speed, and PTO operation:
"Low Cruise Control Speed Set Limit"
"High Cruise Control Speed Set Limit"
"Idle Vehicle Speed Limit"
"Fast Idle RPM #1"
"Fast Idle RPM #2"
"Cruise/Idle/PTO Switch Configuration"
"Idle/PTO Bump rpm"
"Idle/PTO rpm Ramp Rate"
"PTO Vehicle Speed Limit"
"Cruise Pause Switch"The vehicle speed calibration can also affect the Cruise Control, the Idle Set Speed, and the PTO if the vehicle speed calibration is incorrectly programmed. Refer to Troubleshooting, "Customer Specified Parameters".Automatic Transmission Neutral SwitchThe automatic transmission neutral switch is required when the "Transmission Style" parameter is programmed to "Automatic Option 3", "Automatic Option 4", "AT/MT/HT Option 3", or "AT/MT/HT Option 4". This switch is used to indicate when the automatic transmission is in neutral.The automatic transmission neutral switch is an open circuit when the transmission is in gear. Shifting the transmission to the neutral position should close the circuit, which connects the input to the battery voltage. Many other switches in the system connect the input to ground when the circuit is closed.This switch may not be connected to an input on the ECM. The parameter "Transmission Neutral Switch" determines the input to the ECM. If the parameter is programmed to J1/P1:62 a switch must be connected to terminal 62. If the parameter is programmed to "J1939", the switch position will be transmitted to the ECM over the J1939 data link. If a problem is suspected with the J1939 data link, refer to Troubleshooting, "Powertrain Data Link Circuit - Test".The following background information is related to this procedure:The kickout switch refers to the switch that is used to exit the cruise control, the fast idle, the PTO, or the idle set speed.The operation of the Caterpillar electronic engine cruise control is similar to the operation of the cruise controls that are installed in automobiles. The operation of fast idle, idle, and PTO are similar to the operation of cruise except that the idle and the PTO govern engine rpm instead of vehicle speed.Note: Idle in this procedure is an engine idle rpm above the programmed low idle rpm. Idle is set by using the cruise control on/off switch and the set/resume switch. Refer to Troubleshooting, "PTO Switch Circuit - Test" for additional information regarding the programmable options for the Dedicated PTO.Note: Fast idle in this procedure is an engine idle rpm above the programmed low idle rpm. Fast idle is set by using a dedicated fast idle switch.Cruise Control On/Off SwitchThis switch must be ON