SHIM 1772488 - Caterpillar

Introduction (Electronic Control System)
The ECM and the sensors are located on the left side of the engine. Refer to illustration 1.
Illustration 1 g01336338
A typical example of a C4.4 electronic control system (1) Fuel 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 Injection Pump (9) Intake Manifold Pressure Sensor (10) Intake Manifold Pressure Sensor (alternative location) (11) Coolant Temperature SensorNote: If equipped, the wastegate solenoid is installed on the right side of the engine.
Illustration 2 g01336346
Table 1
Connector     Function    
P1     Machine Harness to ECM Connector (64 Pin Connector)    
P2     Engine Harness to ECM Connector (64 Pin Connector)    
P532     Fuel Pump Solenoid Connector (Two-Pin Connector)    
P402     Secondary Speed/Timing Sensor (Two-Pin Connector)    
P401     Primary Speed/Timing Sensor (Two-Pin Connector)    
P201     Engine Oil Pressure Sensor (Three-Pin Connector)    
P228     Fuel Pressure Sensor (Three-Pin Connector)    
P200     Intake Manifold Pressure Sensor (Three-Pin Connector)    
P103     Intake Manifold Temperature Sensor (Two-Pin Connector)    
P100     Coolant Temperature Sensor (Two-Pin Connector)    
J23     Diagnostic Connector (if equipped)    
P691/J691     Electronic Unit Injectors for No. 1 and No. 2 Cylinders (Four-Pin Connector)    
P692/J692     Electronic Unit Injectors for No. 3 and No. 4 Cylinders (Four-Pin Connector)    
P511     Wastegate Valve, if equipped (two-Pin Connector)    The C4.4 engine was designed for electronic control. The engine has an Electronic Control Module (ECM), a fuel injection pump and electronic unit injectors. All of these items are electronically controlled. There are also a number of engine sensors. Turbocharged engines can be equipped with an electronically controlled wastegate for the turbocharger. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the various sensors. The software contains parameters that control the engine operation. The parameters include all of the operating maps and customer-selected parameters.
Illustration 3 g01336351
The electronic control system has the following components:
ECM
Pressure Sensors
Temperature Sensors
Crankshaft Position Sensor
Secondary Position Sensor
Solenoid for the Fuel Injection Pump
Wastegate Solenoid
Electronic Unit InjectorsECM
Illustration 4 g01199973
Typical exampleThe Electronic Control Module (ECM) (1) functions as a governor and a computer for the fuel system. The ECM receives signals from the sensors in order to control the timing and the engine speed.The electronic system consists of the ECM, the engine sensors, and inputs from the parent machine. The ECM is the computer. The personality module is the software for the computer. The personality module contains the operating maps. The operating maps define the following characteristics of the engine:
Engine power
Torque curves
Engine speed (rpm)
Engine Noise
Smoke and EmissionsThe factory passwords restrict changes to authorized personnel. Factory passwords are required to clear any event code. Refer to the following Troubleshooting, "Factory Passwords" For more information on the passwords.The ECM has an excellent record of reliability. Any problems in the system are most likely to be the connectors and the wiring harness. The ECM