C13 and C15 On-highway Engines Caterpillar

Output Selection Parameters

Usage:

C15 B5R

Auxiliary Outputs

The P1 connector has six terminals that can be used to control devices on the vehicle. The terminals are called "Auxiliary Outputs". Each terminal can be programmed to control one device from a list of devices. The terminals must be programmed to match the configuration of the vehicle.

The Engine Control Module (ECM) monitors the current flow through the terminals. The ECM sets a code if the current flow is too low or the current flow is too high. The codes are displayed as "Auxiliary Output" diagnostic codes on the active diagnostic code screen. Table 1 provides information about the codes.

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Table 1
"Auxiliary Output" Diagnostic Trouble Codes
Code	Comments
706-5 707-5 925-5 926-5 2646-5 2647-5	The most likely cause of these codes is incorrect programming of the ECM. If the output is programmed correctly, one of the following conditions exists: There is an open circuit in the vehicle wiring. There is an open circuit in the device.
706-6 707-6 925-6 926-6 2646-6 2647-6	The most likely cause of these codes is a short circuit in the vehicle wiring. If the wiring is OK, there is a problem with the device.
Follow the troubleshooting procedure in order to determine the root cause of the problem.

Troubleshooting Procedure

Refer to Table 2. Determine the P1 terminal that is associated with the code.

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Table 2
Terminal That Is Associated With Each Code
Code	Terminal
706-5 706-6	J1/P1:19
707-5 707-6	J1/P1:20
925-5 925-6	J1/P1:10
926-5 926-6	J1/P1:12
2646-5 2646-6	J1/P1:13
2647-5 2647-6	J1/P1:11

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Illustration 1	g01419135
Terminals that relate to the auxiliary outputs

Refer to Illustration 1. Inspect the P1 connector. Determine if a device is connected to the terminal that relates to the code.

Note: A wire may be connected to a terminal of the P1 connector, but the wire may not be connected to a device. Refer to a schematic for the vehicle wiring in order to determine the actual configuration of the wiring.

If a device is not connected to the terminal, the programming is incorrect. Use Cat ET to determine the programming of each device that is listed in Table 3. The devices are in the "Output Selections" group or the "Engine Monitoring Lamps" group. Determine the device that is incorrectly programmed to the terminal. Program the device to "None" in order to clear the code.

If a device is connected to the terminal, there is a problem with the circuit. Use Cat ET to determine the programming of each device that is listed in Table 3. The devices are in the "Output Selections" group or the "Engine Monitoring Lamps" group. Determine the device that is programmed to the terminal that relates to the code. Refer to the appropriate troubleshooting procedure in order to troubleshoot the code.

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Table 3
Troubleshooting Procedure for Each Device
Device	Troubleshooting Procedure
"Warning Lamp Config"	"Indicator Lamp - Test"
"Low Coolant Level Lamp Config"
"High Coolant Temperature Lamp Config"
"Low Oil Pressure Lamp Config"
"PTO Switch On Lamp"
"Wait to Start Lamp"
"Fast Idle Enabled Lamp"
"Change Oil Lamp"
"Diesel Particulate Filter Lamp"
"Exhaust System High Temperature Lamp"
"Aftertreatment Regeneration Device Disabled Lamp"
"Engine Running Output"	"Engine Running - Test"
"Engine Shutdown Output"	"Shutdown Timer (Idle) - Test"
"Auxiliary Brake"	"Auxiliary Brake - Test"
"Starting Aid Output"	"Starting Aid - Test"
"PTO Active Output"	"Power Take-Off - Test"

Refer to the following examples:

There is a 926-5 diagnostic code. Terminal P1-12 relates to this code. No wire is connected to terminal P1-12. All of the parameters in Table 3 were checked. The "Fast Idle Enabled Lamp" is programmed to "J1/P1:12". In this example, this programming is incorrect. Programming the "Fast Idle Enabled Lamp" parameter to "None" clears the 926-5 code.

There is a 707-5 diagnostic code. Terminal P1-20 relates to this code. A wire is connected to terminal P1-20. However, the schematic for the vehicle wiring shows that the wire is not connected to a device on the vehicle. All of the parameters in Table 3 were checked. The "High Coolant Temperature Lamp Config" parameter is programmed to "J1/P1:20". In this example, this programming is incorrect. Programming the "High Coolant Temperature Lamp Config" parameter to "None" clears the 707-5 code.

There is a 2646-5 diagnostic code. Terminal P1-13 relates to this code. A wire is connected to terminal P1-13. The schematic for the vehicle wiring shows that the wire is connected to the "Exhaust System High Temperature Lamp". The "Exhaust System High Temperature Lamp" parameter was checked. The parameter is programmed to "J1/P1:13". The appropriate troubleshooting procedure in this example is "Indicator Lamp - Test". Refer to that procedure in order to troubleshoot the code.

"Engine Running Output"

This parameter assigns a P1 terminal to the output for the starting motor relay. The output can be programmed to a high side ECM driver or to a low side ECM driver.

High Side ECM Driver - The ECM sets the output to +Battery when the engine rpm increases above the programmed low idle speed. The ECM sets the output to ground if the engine rpm becomes 100 rpm less than the programmed idle speed. The ECM limits the output's current flow to two amperes.

Low Side ECM Driver - The ECM sets the output to ground when the engine rpm is zero. The ECM sets the terminal to an open circuit when the engine rpm increases above the programmed low idle speed.

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Table 4
Default	Alternatives
None	High Side ECM Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side ECM Drivers J1/P1:29, 30, 31

"Engine Shutdown Output"

This parameter assigns a P1 terminal to an output that can be used to shut down the vehicle's electrical system after the idle timer has expired. The output is enabled when the engine has been running for more than three seconds. The output is disabled when the engine rpm becomes 100 rpm less than the programmed idle speed for more than three seconds.

The output can be programmed to a high side ECM driver or to a low side ECM driver. The ECM limits the output's current flow to two amperes when the output is programmed to a high side output driver.

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Table 5
Default	Alternatives
None	High Side ECM Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side ECM Drivers J1/P1:29, 30, 31

"Auxiliary Brake"

This parameter assigns a P1 terminal to an output that is used to control aftermarket braking devices. The ECM activates the output at the appropriate times according to the engine's operating conditions. The ECM limits the current flow to two amperes when the output is programmed to a high side output driver.

High Side Output Driver - The ECM sets the output to +Battery when the appropriate conditions exist for activation of an auxiliary brake. The ECM limits the output's current flow to two amperes.

Low Side Output Driver - The ECM sets the output to ground when the appropriate conditions exist for activation of an auxiliary brake.

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Table 6
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Starting Aid Output"

This parameter assigns a P1 terminal to the output for automatic control of a starting aid (ether). The ECM activates the output when the conditions are correct for the use of the starting aid.

Note: This output will not function if the "Starting Aid On/Off Switch" parameter is programmed to accept input from a starting aid switch and the starting aid switch is OFF.

High Side Output Driver - The ECM sets the output to +Battery when the appropriate conditions exist for activation of the starting aid. The ECM limits the output's current flow to two amperes.

Low Side Output Driver - The ECM sets the output to ground when the appropriate conditions exist for activation of the starting aid.

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Table 7
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"PTO Active Output"

This parameter assigns a P1 terminal to an output that is activated when the PTO mode is active. The output can be programmed to a high side output driver or to a low side output driver.

High Side Output Driver - The ECM sets the output to +Battery when the PTO mode is active. The ECM limits the output's current flow to two amperes.

Low Side Output Driver - The ECM sets the output to ground when the PTO mode is active.

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Table 8
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"PTO Switch On Lamp"

This parameter assigns a P1 terminal to an output that is activated when the PTO switch is ON. The output is usually connected to a lamp. The output can be programmed to a high side output driver or to a low side output driver.

High Side Output Driver - The ECM sets the output to +Battery when the PTO switch is ON. The ECM limits the output's current flow to two amperes.

Low Side Output Driver - The ECM sets the output to ground when the PTO switch is OFF.

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Table 9
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Fast Idle Enabled Lamp"

This parameter assigns a P1 terminal to an output that is activated when the fast idle is engaged. The output is usually connected to a lamp. The output can be programmed to a high side output driver or to a low side output driver.

High Side Output Driver - The ECM sets the output to +Battery when the fast idle is engaged. The ECM limits the output's current flow to two amperes.

Low Side Output Driver - The ECM sets the output to ground when the fast idle is engaged.

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Table 10
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Lockout Solenoid (Top 2 Transmission)"

The ECM operates two outputs in order to control shifting between the top two gears of an Eaton Top 2 transmission. The "Lockout Solenoid" and "Shift Solenoid" parameters must be programmed to the correct terminals on the P1 connector.

Note: The "Transmission Style" parameter must be programmed to "Eaton Top 2" in order to program this parameter.

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Table 11
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Shift Solenoid (Top 2 Transmission)"

Note: The "Transmission Style" parameter must be programmed to "Eaton Top 2" in order to program this parameter.

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Table 12
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Diesel Particulate Filter Lamp"

This parameter determines the programming for the "diesel particulate filter lamp". The lamp illuminates when the vehicle speed is less than 32 km/h (20 mph) and an active regeneration is required. The output can be programmed to a high side output driver or to a low side output driver.

Programmed to a High Side Output Driver

The output is set to +Battery when the output is activated. The ECM limits the output's current flow to two amperes.

Programmed To a Low Side Output Driver

The output is connected to ground when the output is activated.

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Table 13
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Exhaust System High Temperature Lamp"

This parameter determines the programming for the "exhaust system high temperature lamp". The lamp illuminates when the temperature at the outlet of the Diesel Particulate Filter (DPF) is above 450 °C (842 °F) and the vehicle speed is less than 8 km/h (5 mph). The output can be programmed to a high side output driver or to a low side output driver.

Programmed to a High Side Output Driver

The output is set to +Battery when the output is activated. The ECM limits the output's current flow to two amperes.

Programmed To a Low Side Output Driver

The output is connected to ground when the output is activated.

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Table 14
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Aftertreatment Disabled Lamp"

This parameter determines the programming for the "aftertreatment disabled lamp". The lamp illuminates when the "aftertreatment disable switch" is OFF. The output can be programmed to a high side output driver or to a low side output driver.

Programmed to a High Side Output Driver

The output is set to +Battery when the output is activated. The ECM limits the output's current flow to two amperes.

Programmed To a Low Side Output Driver

The output is connected to ground when the output is activated.

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Table 15
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Air Inlet Shutoff Control Relay"

This parameter determines the programming for the output that controls the air inlet shutoff relay. The output's current flow is limited to 1.5 amperes.

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Table 16
Default	Alternatives
None	J2/P2:4

"Wait to Start Lamp"

This parameter applies to C7 engines and C9 engines.

The ECM enables the output terminal that is programmed when the air inlet heater is operating and the engine is not running.

Note: The output for the lamp is not the output for the air inlet heater.

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Table 17
Default	Alternatives
None	High Side Output Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Output Drivers J1/P1:29, 30, 31

"Change Oil Lamp"

This parameter applies to C7 engines and C9 engines.

The ECM enables the output terminal that is programmed when the oil change interval exceeds the value that is programmed into the "PM1 Interval" parameter. The following parameters must be correctly programmed in order for the "change oil lamp" to operate correctly: