C-10, C-12 and C-15 On-highway Engines Caterpillar

"Fan Override Switch"

Four input connections can be used in order to connect the "Fan Override Switch". The "Fan Override Switch" can be programmed to the following ECM pins:

• J1/P1:7 (Input 4)

• J1/P1:47 (Input 5)

• J1/P1:6 (Input 6)

• J1/P1:46 (Input 7)

The J1939 data link can also be used to control the "Fan Override Switch".

This switch will allow the operator to turn on the cooling fan at any time for improved retarding and braking of the engine. This will also allow better engine cooling.

"Ignore Brake/Clutch Switch"

The Input 5 to the ECM can be used to connect an "Ignore Brake/Clutch Switch". The "Ignore Brake/Clutch Switch" is used for applications that require the mobile use of the vehicle with a set PTO engine set rpm that does NOT require the Brake or the Clutch to disengage the engine's PTO operation. This parameter ("Ignore Brake/Clutch Switch") must be programmed to J1/P1:47 to enable this feature.

"Torque Limit Switch"

The Input 4 to the ECM can be used to connect the "Torque Limit Switch" in order to limit the engine torque to a programmable value. This should only be used for temporary protection of equipment. The "Torque Limit Switch" parameter cannot be programmed if the "PTO Configuration" is programmed to "OFF". If the "PTO Configuration" is programmed to "OFF", the ECM will ignore the "Torque Limit Switch". This parameter ("Torque Limit Switch") must be programmed to J1/P1:7 to enable this feature.

"Diagnostic Enable"

The J1939 data link and input 7 can be used to connect the "Diagnostic Enable". Diagnostic flash codes can be prompted by using the "Diagnostic Enable". To initiate the flash codes, depress the momentary "Diagnostic Enable" until the Check Engine Lamp begins to flash. Refer to Troubleshooting, "Diagnostic Codes" for additional information regarding flash codes.

"PTO On/Off Switch"

This parameter allows the connection of a "PTO On/Off Switch" using either the J1939 data link or J1/P1:56.

"Remote PTO Set Switch"

The J1939 data link and input 2 can be used to connect the "Remote PTO Set Switch". The "Remote PTO Set Switch" is used when the "PTO Configuration" is programmed to Remote Switches and the "PTO On/Off" switch is in the ON position.

"Remote PTO Resume Switch"

The J1939 data link and input 3 can be used to connect the "Remote PTO Resume Switch". The "Remote PTO Resume Switch" is used when the "PTO Configuration" is programmed to Remote Switches and the "PTO On/Off" switch is in the ON position.

"PTO Engine RPM Set Speed Input A"

The "PTO Engine RPM Set Speed Input A" switch can be connected to any one of the following locations: J1/P1:6, J1/P1:46, J1/P1:58, J1/P1:60 and J1939 data link. If the "PTO Engine RPM Set Speed Input A" parameter is programmed to the corresponding switch input option, the switch is used to control engine speed during PTO operation. The "PTO Configuration" parameter must be programmed to Cab Switches, Remote Switches or Remote Throttle and the "PTO Engine RPM Speed Input A" parameter must be programmed to a valid speed.

"PTO Engine RPM Speed Input B"

The "PTO Engine RPM Set Speed Input B" switch can be connected to any one of the following locations: J1/P1:6, J1/P1:46, J1/P1:58, J1/P1:60 and J1939 data link. If the "PTO Engine RPM Set Speed Input B" parameter is programmed to the corresponding switch input option, the switch is used to control engine speed during PTO operation. The "PTO Configuration" parameter must be programmed to Cab Switches, Remote Switches or Remote Throttle and the "PTO Engine RPM Speed Input B" parameter must be programmed to a valid speed.

"Starting Aid On/Off Switch"

The "Starting Aid On/Off Switch" can be connected to either of the following locations: J1/P1:6, J1/P1:7, J1/P1:46 and J1/P1:47. The Starting Aid System does not require a switch for Automatic operation. A switch can be installed in order to allow the operator to disable the Automatic Starting Aid. If a switch is installed and the "Starting Aid On/Off Switch" parameter is programmed to the corresponding switch input, the switch will control the Starting Aid system. When the switch is in the ON position, the Starting Aid System will automatically enable the Starting Aid Output when conditions require the use of a starting aid. When the switch is in the Off position, the Starting Aid System will not function.

"Two-Speed Axle Switch"

The J1939 data link and input 6 to the ECM is used to connect the "Two-Speed Axle On/Off Switch". When a two-speed axle is used, the change in gear ratios from the high speed range to the low speed range alters the calibration of the vehicle speed signal. When this parameter is programmed to J1/P1:6 or J1939 and the switch is in the ON position the ECM automatically adjusts the vehicle speed calibration. This will ensure that the ECM driven speedometer and the information that is stored in the ECM correctly reflect the actual vehicle speed. The "High Speed Range Axle Ratio" and "Low Speed Range Axle Ratio" must also be programmed for this feature to function correctly.

"Cruise Control On/Off Switch"

The "Cruise Control On/Off" input circuit is available for the connection of a "Cruise Control On/Off Switch" to ECM Connector J1/P1:59 or the J1939 data link. This switch is used to enable Cruise Control when the vehicle is moving. Also, this switch is used to control the engine idle rpm when the vehicle is stationary.

"Cruise Control Set/Resume/Accel/Decel Switch"

The "Cruise Control Set/Resume" input circuits are available for the connection of a cruise control set/resume switch. This parameter can be programmed to J1/P1:35 & 44 or J1939. If the parameter is set to J1/P1:35 & 44, the Set input should be connected to J1/P1:35 and the Resume input should be connected to J1/P1:44. This switch is used in conjunction with the Cruise Control On/Off Switch to perform the following functions:

• Control the operation of the cruise control while the vehicle is moving.

• Adjust the engine idle rpm while the vehicle is stationary.

• Enable the Diagnostic Flash Codes on the Check Engine Lamp.

When the "PTO Configuration" is programmed to Cab Switches, the "Cruise Control Set/Resume Switch" is also used with the "PTO On/Off" switch to control the engine rpm in PTO Mode.

"Cruise Control Pause Switch"

This parameter configures an input for use as a cruise control pause switch. This functionality is only available for use over a J1939 data link.

"Clutch Pedal Position Switch"

The Input for the "Clutch Pedal Position Switch" is available for the connection of a Clutch Pedal Position Switch to ECM Connector J1/P1:22 or the J1939 data link. This input is used when the "Transmission Style" is programmed to the Manual Mode. When the "Transmission Style" is programmed to the Manual Mode, an input that is used to determine the position of the clutch pedal is required.

"Retarder Off/Low/Med/High Switch"

The input for the "Retarder Solenoid Low/Hi Switch" and the input for the "Retarder Solenoid Med/Hi Switch" are available for the connection of a selector switch for engine retarder solenoid. The Retarder Switch can be connecting using the J1939 data link or using J1/P1:23 & 40. If J1/P1:23 & 40 is used, the Low/Hi Input should be connected to ECM Connector J1/P1:23 and the Med/Hi Input should be connected to ECM Connector J1/P1:40. This switch controls the operation of the Engine Retarder Solenoids.

"Service Brake Pedal Position Switch #1"

The Input for "Service Brake Pedal Position Switch 1" is available for the connection of a Service Brake Pedal Position Switch. The "Service Brake Pedal Position Switch 1" can be connected by using the J1939 data link or by using ECM connector J1/P1:45. The input is used to determine the position of the service brake pedal. The position of the service brake pedal can affect the following functions:

• Cruise

• Idle

• PTO

• Idle Shutdown

"Accelerator Pedal Position"

The Input for the "Accelerator Pedal Position" is available for the connection of an Accelerator Pedal Position Sensor. The Sensor's signal line should be connected to ECM Connector J1/P1:66. This parameter ("Accelerator Pedal Position") must be programmed to J1/P1:66. The input is used to determine the position of the Accelerator Pedal.

"Vehicle Speed Input"

The ECM has an input circuit that can be used to receive vehicle speed information. The ECM input can receive the vehicle speed information in either of the following ways:

• A vehicle speed sensor can be connected to the input.

• A signal wire from an electronic control can be connected to the input.

The "Vehicle Speed Input" parameter must be programmed to "J1/P1:32 & 33" to use this option.

The ECM can also be configured to receive vehicle speed information from an Electronic Transmission Control Unit via the J1939 data link. The transmission must be capable of supporting the "J1939 ETC1 Broadcast Message". The "Vehicle Speed Input" must be programmed to "J1939-Trans".

The ECM can also be configured to receive vehicle speed information from the ABS system via the J1939 data link. The ABS system must be capable of supporting the "J1939 High Resolution Wheel Speed Broadcast Message". The "Vehicle Speed Input" must be programmed to "J1939-ABS".