3408 & 3412 HIGH PERFORMANCE MARINE ENGINES Caterpillar


P-525 Shutoff Solenoid

Usage:

System Operation

Although the rack solenoid (BTM) is capable of shutting the engine down, the shutoff solenoid provides a secondary means for the ECM to shut down the engine. When the solenoid receives a voltage, the solenoids' plunger is pulled in to allow the engine to run. When the solenoid loses the voltage, the plunger releases and the engine shuts down.

If an overspeed condition is detected by the overspeed switch, the relay in the overspeed switch box will open causing the shutoff solenoid to release and the engine to shut down.

With the engine running, the voltage at the shutdown solenoid connector should be between 1.5 and 2.5 VDC (from pin A to pin B).

Schematic

NOTE: For a more detailed schematic, refer to 3408/3412 High Performance Marine Engine Schematic, Form No. SENR5518.

Diagnostic Codes

Functional Test

Caterpillar Information System:

3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-524 Engine Shutdown Switch
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-523 Backup Engine Speed Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-522 Main Engine Speed Sensor/Adjustment
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-521 Sensor Supply Voltage
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-520 ECM/Personality Module
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-510 High Coolant Temperature Warning
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-509 Low Coolant Level Warning
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-508 Low Boost Pressure Warning
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-507 Transmission Oil Pressure/Temperature Warning
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-506 ECM Diagnostic Lamp
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-505 Low Engine Oil Pressure Warning
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-504 Trolling Mode
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-526 Coolant Level Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-527 Coolant Temperature Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-528 Boost Pressure Sensor/Calibration
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-529 Engine Oil Pressure Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-530 Transmission Oil Pressure Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-531 Transmission Oil Temperature Sensor
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-540 Dynamic Rack Controls
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-541 - Rack Position Sensor/Calibration
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-542 Rack Solenoid (BTM)
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-550 Electronic Speed Switch (ESS) Replacement
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-551 Engine Speed Switch Crank Terminate Test
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES P-552 ESS And Relay Test
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