WASHER-THRUST 9D1529 - Caterpillar

Table 4
Implement ECM Connector J2 Contact Descriptions
No. Type Function
1 Battery (+) Battery (+) Inputs
The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. The inputs to ECMs are listed in table .Temperature Sensors
Hydraulic Oil Temperature Sensor
Illustration 4 g03372378
Hydraulic Oil Temperature Sensor
The temperature sensor for the hydraulic oil informs the ECM of the temperature of the hydraulic system oil. The sensor is designed internally to change resistance based on the temperature of the hydraulic oil. The Implement ECM uses a pull up resistor to receive sensor voltage and convert the voltage to a temperature reading. The resistance range for this sensor is 33,650 ohms at −40° C (−40° F)to 18.6 ohms at 150° C (302° F).Coolant Sensor
Engine coolant temperature is measured by an electronic sensor that is mounted on the water outlet housing. The coolant sensor signal is used to modify the fueling and timing of the engine. Modifying the fueling and timing of the engine improves the cold start characteristics of the engine. Modifying the fueling and timing improves the white smoke emissions of the engine. The ECM supplies the coolant temperature sensor with 5.0 .5 VDC. The output voltage of the coolant sensor ranges from .5 to 5.5 VDC. The output depends on the engine coolant temperature.Air Inlet Temperature
The air inlet temperature sensor and the coolant temperature sensor are passive sensors. Each sensor provides a temperature input to the ECM. The ECM controls following operations:
Fuel delivery
Injection timingThe operating range for the sensors ... −40° to 125°C (−40° to 257°F)The sensors are also used for engine monitoring.Switches
Key Start Switch
Illustration 5 g03096077The key switch is an input to the ECM. Power is supplied to the ECM from the key switch. Power is supplied to the ECM from the key switch when the key switch is in the START or RUN position.The key switch is a switch to battery input and is active when the key switch is in the START or RUN position. When the key switch is turned to START, the ECM receives a + battery signal from the key switch. If all start interlocks are satisfied, the ECM will send a + battery signal to the start relay to start the engine.Outputs
The ECMs respond to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. The outputs of the ECM are listed in tables .Solenoids
Illustration 6 g03371419Engine Cooling Fan Solenoid
The engine cooling fan solenoid controls the fan piston pump pressure compensator to increase or decrease fan speed.Relay
Illustration 7 g03323937Variable Pitch Fan Relay (If equipped)
The