C7 and C9 On-Highway Engines Caterpillar

The Engine Control Module (ECM) provides nine outputs that can be used to illuminate indicator lamps. The Caterpillar Electronic Technician (ET) can be used to program each output to a specific J1/P1 terminal. Some of the outputs can be programmed to a J1939 device.

Each J1/P1 output is a high side driver or a low side driver.

High Side Driver - The ECM provides an output voltage that is approximately equal to the battery voltage in order to activate the lamp.

Low Side Driver - The ECM provides a connection to ground in order to activate the lamp.

"Red Stop Lamp"

This parameter determines the terminal that is activated for the "red stop lamp".

Table 1

Default	Alternatives
J1/P1:29	High Side Drivers J1/P1:10, 11, 12, 13, 19, 20 Low Side Drivers J1/P1:29, 30, 31

"Low Coolant Level Lamp"

This parameter determines the terminal that is activated for the "low coolant level lamp".

Table 2

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

"High Coolant Temperature Lamp"

This parameter determines the terminal that is activated for the "high coolant temperature lamp".

Table 3

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

"Low Oil Pressure Lamp"

This parameter determines the terminal that is activated for the "low oil pressure lamp".

Table 4

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

"Coolant Level Sensor"

This parameter determines the terminal that is activated for the "high coolant temperature lamp".

Table 5

Default	Alternatives
Not Programmed	4-Pin Sensor 2 Wire Float 2-Pin Switch