Input 4 (Torque Limit Switch)

319

TM 9-2320-312-24-2

Troubleshooting Section

When a two-speed axle is used, the change in gear

The ECM can use various inputs in a number

ratios from the main drive axle ratio will alter the

of ways. The inputs depend on the parameter

calibration of the vehicle speed signal. When the

programming. Certain features are available on

two-speed axle switch is in the ON position, the

several different inputs. The configuration for the

ECM will automatically adjust the vehicle speed

switch must match the actual switch installation in

calibration. This will ensure that the ECM driven

order for the switch to function properly.

speedometer and the stored information in the ECM

correctly reflect the actual vehicle speed. In order

Input 4 (Torque Limit Switch)

for this feature to function properly, the "Low Speed

Range Axle Ratio" and "High Speed Range Axle

MAR98 and Newer Software

Ratio" parameters must be programmed. If the

"Input # 6" parameter is programmed to "None"

The torque limit switch provides a way to temporarily

(default), this feature is not used.

protect equipment from damage that is caused

by applying too much torque. Torque limiting is

OCT01 Software

typically used during PTO operation. Torque limiting

can also be used when the PTO on/off switch is

The parameter "Input # 6" has been replaced by the

in the OFF position.

parameter "Two-Speed Axle Switch". This parameter

can be programmed to "J1/P1:6" or "None".

In order to use torque limiting, the parameter

"Torque Limit" must be programmed. The "Torque

Input 7 (Diagnostic Enable Switch)

Limit" parameter is located under the "Dedicated

PTO Parameters". The default setting is 2712 Nm

JUL99 and Newer Software

(2000 lb ft). The "Input # 4" parameter must be

programmed to "Torque Limit Switch". If the "Input

The diagnostic enable switch is used to prompt

# 4" parameter is programmed to "None" (default),

diagnostic flash codes on the check engine lamp.

this feature is not used.

For more information, refer toTroubleshooting, "Flash

Programming" and Troubleshooting, "Check Engine

OCT01 Software

Lamp or Warning Lamp is Malfunctioning". If the

"Input # 7" parameter is programmed to "None"

The parameter "Input # 4" has been replaced by

(default), then the feature is not used. If the "Input #

the parameter "Torque Limit Switch". This parameter

7" parameter is programmed to "Diagnostic Enable

can be programmed to "J1/P1:7", "J1/P1:23", or

Switch", then the feature is available and the switch

"None".

circuit should be connected to terminal 46 of the

J1/P1 ECM vehicle harness connector.

Input 5 (Ignore Brake/Clutch Switch)

OCT01 Software

MAR98 and Newer Software

The parameter "Input # 7" is no longer used.

The ignore brake/clutch switch is typically used

"Diagnostic Enable" is the parameter that is used

when the parameter "PTO Configuration" is

to configure a diagnostic enable switch. This

programmed to "Cab Switches". This configuration

parameter can be programmed to "J1/P1:46",

requires mobile use of the vehicle during PTO

"J1939 Cab Controller", "J1939 Body Controller",

operation. When the ignore brake/clutch switch

"J1939 Instrument Cluster", or "None". For

is on, depressing the brake or the clutch will not

troubleshooting the J1939 options, refer to

disengage PTO operation or a set engine speed. If

Troubleshooting, "Powertrain Data Link Circuit -

the "Input # 5" parameter is programmed to "None"

Test".

(default), this feature is not used. For information on

troubleshooting this switch, refer to Troubleshooting,

JUL99 and Newer Software

"Ignore Brake/Clutch Switch Circuit - Test".

"Input # 7" can be programmed to "Diagnostic

OCT01 Software

Enable Switch" or to "PTO Engine RPM Set Speed

Input A". If the "Input # 7" parameter is programmed

The parameter "Input # 5" has been replaced by

to "PTO Engine RPM Set Speed Input A" the

the parameter "Ignore Brake/Clutch Switch". This

switch is used to control engine speed during PTO

parameter can be programmed to "J1/P1:47" or

operation. The switch circuit should be connected

"None".

to terminal 46 of the J1/P1 ECM vehicle harness

connector. The "PTO Configuration" parameter

Input 6 (Two-Speed Axle Switch)

must be programmed to "Cab Switches", "Remote

Switches" or "Remote Throttle" and the "PTO

MAR98 and Newer Software

Engine RPM Speed Input A" parameter must be

programmed to a valid speed.