C4.4 and C6.6 Industrial Engines and Engines for Caterpillar Built Machines Caterpillar

Sensors and Electrical Connectors

Usage:

C4.4 444

The Electronic Control Module (ECM) and the sensors are located on the left side of the engine. Refer to Figure 1 or refer to Figure 3.

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Illustration 1	g01779721
Sensor locations on the C4.4 engine (1) Fuel Rail Pressure Sensor (2) Intake Manifold Air Temperature Sensor (3) Electronic Control Module (ECM) (4) Primary Speed/Timing Sensor (5) Oil Pressure Sensor (6) Oil Pressure Sensor (alternative location) (7) Secondary Speed/Timing Sensor (8) Solenoid for the Fuel Rail Pump (9) Intake Manifold Pressure Sensor (10) Intake Manifold Pressure Sensor (alternative location) (11) Coolant Temperature Sensor

Note: If equipped, the wastegate regulator is installed on the right side of the engine.

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Illustration 2	g01780734
Close up views of sensor locations on the C4.4 engine

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Illustration 3	g01780873
Sensor locations on the C6.6 engine (1) Coolant Temperature Sensor (2) Intake Manifold Air Temperature Sensor (3) Intake Manifold Pressure Sensor (4) Fuel Rail Pressure Sensor (5) Electronic Control Module (ECM) (6) Oil Pressure Sensor (7) Primary Speed/Timing Sensor (8) Secondary Speed/Timing Sensor (9) Solenoid for the Fuel Rail Pump

Note: If equipped, the wastegate regulator is installed on the right side of the engine.

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Illustration 4	g01780875
Close up views of sensor locations on the C6.6 engine

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Table 1
Connector	Function
P1	Machine Harness to ECM Connector (64 Pin Connector)
P2	Engine Harness to ECM Connector (64 Pin Connector)
P532	Fuel Rail Pump Solenoid Connector (2 Pin Connector)
P402	Secondary Speed/Timing Sensor (2 Pin Connector)
P401	Primary Speed/Timing Sensor (2 Pin Connector)
P201	Engine Oil Pressure Sensor (3 Pin Connector)
P228	Fuel Rail Pressure Sensor (3 Pin Connector)
P200	Intake Manifold Pressure Sensor (3 Pin Connector)
P103	Intake Manifold Air Temperature Sensor (2 Pin Connector)
P100	Coolant Temperature Sensor (2 Pin Connector)
J23	Diagnostic Connector (if equipped)
P691/J691	Electronic Unit Injectors for No. 1 and No. 2 Cylinders (4 Pin Connector)
P692/J692	Electronic Unit Injectors for No. 3 and No. 4 Cylinders (4 Pin Connector)
P693/J693 (C6.6 only)	Electronic Unit Injectors for No. 5 and No. 6 Cylinders (4 Pin Connector)
P511	Wastegate regulator (if equipped) (2 Pin Connector)

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Illustration 5	g01765134
Schematic diagram for the C4.4 engine (1) Electronic Unit Injector (2) Solenoid for the Fuel Rail Pump (3) Wastegate Regulator (if equipped) (4) Secondary Speed/Timing Sensor (5) Fuel Rail Pump (6) Primary Speed/Timing Sensor (7) Intake Manifold Pressure Sensor (8) Fuel Rail Pressure Sensor (9) Engine Oil Pressure Sensor (10) Intake Manifold Air Temperature Sensor (11) Coolant Temperature Sensor (12) Diagnostic Connector (if equipped) (13) Electronic Control Module (ECM)

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Illustration 6	g01765135
Schematic diagram for the C6.6 engine (1) Electronic Unit Injector (2) Solenoid for the Fuel Rail Pump (3) Wastegate Regulator (if equipped) (4) Secondary Speed/Timing Sensor (5) Fuel Rail Pump (6) Primary Speed/Timing Sensor (7) Intake Manifold Pressure Sensor (8) Fuel Rail Pressure Sensor (9) Engine Oil Pressure Sensor (10) Intake Manifold Air Temperature Sensor (11) Coolant Temperature Sensor (12) Diagnostic Connector (if equipped) (13) Electronic Control Module (ECM)