Cruise Control On/Off Switch -807640398

220

TM 9-2320-312-24-2

Troubleshooting Section

"Idle/PTO rpm Ramp Rate"

After a speed has been set, pressing and holding

the set/resume switch in position will cause the

"PTO Vehicle Speed Limit"

engine to establish a new set speed. The system's

reaction depends on the programming of the

"Cruise/Idle/PTO Switch Configuration".

The vehicle speed calibration can also affect the

cruise control, the fast idle, the idle set speed,

When the set/resume switch is momentarily pressed,

extended idle, and the PTO if the vehicle speed

the cruise set point will change one mph. The

calibration is incorrectly programmed. Refer to

rate of change is dependent on the programmed

Troubleshooting, "Customer Specified Parameters".

"Idle/PTO Bump RPM" when an idle speed is set.

Cruise Control On/Off Switch

Cruise Control Pause Switch

This switch must be ON before cruise control or

The cruise control pause switch is not a switch

controlled idle can be activated. This switch is

that is wired to an input. The switch position is

ON when the switch is closed. When the switch is

broadcast over a J1939 data link. The parameter

closed the following terminals are connected:

"Cruise Pause Switch" must be programmed to

ECM connector J1/P1 terminal 59 (cruise control

use a cruise control pause switch. After a speed

has been set and the speed is then disengaged

on/off switch)

by using the cruise control pause switch, the ECM

Terminal 5 (ap sensor/switch sensor common)

will seek the previous set speed when the resume

switch is toggled. This assumes that the vehicle

speed is above the "Low Cruise Control Speed

This switch may not be connected to an input on

Set Limit" for cruise control or the vehicle speed is

the ECM. The parameter "Cruise Control On/Off

below the "Idle/PTO Vehicle Speed Limit" for the

Switch" determines the input to the ECM. If the

idle and the PTO.

parameter is programmed to J1/P1:59 a switch

must be connected to terminal 59. If the parameter

The following background information is related

is programmed to one of the J1939 options, the

to this procedure:

switch position will be transmitted to the ECM over

the J1939 data link. If a problem is suspected

The kickout switch refers to the switch that is used

with the J1939 data link, refer to Troubleshooting,

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

"Powertrain Data Link Circuit - Test".

the idle set speed.

Note: If the vehicle is programmed to use the

The operation of the Caterpillar Electronic Engine

dedicated PTO, the PTO on/off switch overrides the

cruise control is similar to the operation of the

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

cruise controls that are installed in automobiles.

overrides the cruise control on/off switch when

The operation of idle fast idle, and PTO are similar

the vehicle speed is within the range of the "PTO

to the operation of cruise except that the idle, fast

Vehicle Speed Limit" that is programmed.

idle, and the PTO govern engine rpm instead of

vehicle speed.

Set/Resume Switch

Note: Idle in this procedure is an engine idle rpm

With the cruise control on/off switch in the ON

above the programmed low idle rpm. Idle is set

position and the vehicle speed within the range

by using the cruise control on/off switch and the

of the programmed "Low Cruise Control Speed

set/resume switch. Refer to Troubleshooting, "PTO

Set Limit" and the "High Cruise Control Speed Set

Switch Circuit - Test" for additional information

Limit", momentarily pressing the set switch will

regarding the programmable options for the

activate the cruise or controlled idle, and the ECM

dedicated PTO.

will maintain the current speed.

Kickout Switches

After a speed has been set and the speed is then

disengaged by using the brake, the clutch, the

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

the ECM will seek the previous set speed when the

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

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

for the idle and the PTO.