C4.4 Marine Generator Set Caterpillar

Sensors and Electrical Connectors

Usage:

C4.4 NRP

The Electronic Control Module (ECM) and most of the engine sensors are located on the left side of the engine. Refer to Illustration 3.

For the remaining sensors that are attached to the engine, refer to Illustration 1.

Note: In the following illustrations, some components have been removed in order to improve visibility.

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Illustration 1	g03628001
Sensor locations on the left side of the engine (1) Intake manifold air temperature sensor (2) Intake manifold pressure sensor (3) Electronic Control Module (ECM) (4) Primary speed/timing sensor (5) Primary fuel filter inlet pressure sensor (MCS only) (6) Primary fuel filter outlet pressure sensor (MCS only) (7) Engine oil temperature sensor (MCS only) (8) Secondary fuel filter inlet pressure sensor (MCS only) (9) Secondary fuel filter outlet pressure sensor (10) Fuel leakage sensor (11) Sea water pressure sensor (raw water cooling system only) or cooling water pressure sensor (keel cooling system only) (12) Oil pressure sensor (13) Fuel temperature sensor (14) Solenoid for the high-pressure fuel pump (15) Coolant temperature sensor (16) Coolant level switch (if equipped) (17) Fuel rail pressure sensor

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Illustration 2	g03636756
Sensor locations on the left side of the engine (1) Intake manifold air temperature sensor (2) Intake manifold pressure sensor (3) Electronic Control Module (ECM) (4) Primary speed/timing sensor (5) Primary fuel filter inlet pressure sensor (MCS only) (6) Primary fuel filter outlet pressure sensor (MCS only) (7) Engine oil temperature sensor (MCS only) (8) Secondary fuel filter inlet pressure sensor (MCS only) (9) Secondary fuel filter outlet pressure sensor (10) Fuel leakage sensor (11) Sea water pressure sensor (raw water cooling system only) or cooling water pressure sensor (keel cooling system only) (12) Oil pressure sensor (13) Fuel temperature sensor (14) Solenoid for the high-pressure fuel pump (15) Coolant temperature sensor (16) Coolant level switch (if equipped)

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Illustration 3	g03637296
Sensor locations on the right side of the engine (17) Coolant temperature shutdown switch (18) Exhaust gas temperature sensor (hidden) (19) Oil pressure shutdown switch (20) Oil filter inlet pressure sensor (if equipped) (21) Secondary speed/timing sensor (22) Engine speed sensor (if equipped)(located on left side on MCS) (23) Coolant pressure sensor (if equipped)