Clutch Switch

176

TM 9-2320-312-24-2

Troubleshooting Section

PTO on/off switch

The kickout switch refers to the switch that is used

to exit the cruise control, the fast idle, the PTO, or

cruise control pause switch

the idle set speed.

The operation of the Caterpillar electronic engine

The switches are described in the respective circuit

cruise control is similar to the operation of the

tests in Troubleshooting.

cruise controls that are installed in automobiles. The

operation of fast idle, idle and PTO are similar to the

All of the following Customer Programmable

operation of cruise except that the idle and the PTO

Parameters can affect cruise control, fast idle, idle

govern engine rpm instead of vehicle speed.

set speed, and PTO operation:

"Low Cruise Control Speed Set Limit"

Note: Idle in this procedure is an engine idle rpm

above the programmed low idle rpm. Idle is set

"High Cruise Control Speed Set Limit"

by using the cruise control on/off switch and the

set/resume switch. Refer to Troubleshooting, "PTO

"Idle Vehicle Speed Limit"

Switch Circuit - Test" for additional information

regarding the programmable options for the

"Fast Idle RPM #1"

Dedicated PTO.

"Fast Idle RPM #2"

Note: Fast idle in this procedure is an engine idle

rpm above the programmed low idle rpm. Fast idle

"Cruise/Idle/PTO Switch Configuration"

is set by using a dedicated fast idle switch.

"Idle/PTO Bump rpm"

Cruise Control On/Off Switch

"Idle/PTO rpm Ramp Rate"

This switch must be on before cruise control or

controlled idle can be activated. This switch is

"PTO Vehicle Speed Limit"

on when the switch is closed. When the switch is

closed the following terminals are connected:

"Cruise Pause Switch"

ECM connector J1/P1 terminal 59 (cruise control

The vehicle speed calibration can also affect

on/off switch)

the cruise control, the idle set speed, and the

Terminal 5 (AP sensor/switch sensor common)

PTO if the vehicle speed calibration is incorrectly

programmed. Refer to Troubleshooting, "Customer

Specified Parameters".

Note: If the vehicle is programmed to use the

"Dedicated PTO", the PTO on/off switch overrides

the cruise control on/off switch. The PTO on/off

Clutch Switch

switch overrides the cruise control on/off switch

The clutch pedal position switch is normally closed

when the vehicle speed is within the range of the

when the pedal is released. Depressing the clutch

"PTO Vehicle Speed Limit" that is programmed.

pedal should open the circuit. This switch is OEM

supplied. The clutch pedal position switch is

Set/Resume Switch

typically a limit switch that is mounted near the

pedal. The clutch pedal position switch is usually

With the cruise control on/off switch in the ON

adjustable.

position and the vehicle speed within the range

of the programmed "Low Cruise Control Speed

This switch may not be connected to an input on

Set Limit" and the "High Cruise Control Speed Set

the ECM. The parameter "Clutch Pedal Position

Limit", momentarily pressing the set switch will

Switch" determines the input to the ECM. If the

activate cruise control, and the ECM will maintain

parameter is programmed to J1/P1:22 a switch

the current speed.

must be connected to terminal 22. If the parameter

is programmed to one of the J1939 options, the

After a speed has been set and the speed is then

switch position will be transmitted to the ECM over

disengaged by using the brake, the clutch, the

the J1939 data link. If a problem is suspected

cruise control pause switch, or the on/off switch,

with the J1939 data link, refer to Troubleshooting,

the ECM will seek the previous set speed when the

"Powertrain Data Link Circuit - Test".

resume switch is toggled. This assumes that the

vehicle speed is above the "Low Cruise Control

Speed Set Limit" for cruise control or the vehicle

The following background information is related

speed is below the "Idle/PTO Vehicle Speed Limit"

to this procedure:

for the idle and the PTO.