3408 & 3412 HIGH PERFORMANCE MARINE ENGINES Caterpillar


P-504 Trolling Mode

Usage:

System Operation

The trolling switch is used to activate trolling mode operation. During trolling mode operation the full range travel of the throttle lever will cause the engine speed to change from low idle engine speed to maximum programmable trolling speed. The trolling mode will only be activated by the electronic control module when engine speed is within 30 rpm of low idle speed. The trolling mode can also be activated when engine is not running.

Trolling mode is activated by pulling the trolling mode input to battery ground.

The trolling signal goes to the ECM through pin 6 of P14. Voltage at P14 pin 6 should be 5.0 plus or minus 0.5 V with the switch open and less than 0.5 V with the switch closed.

Schematic

Functional Test

Caterpillar Information System:

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