WASHER-THRUST 4230938 - Caterpillar

Table 3
Power train ECM Control J1 Contact Descriptions(1)
No. Type Function
1 Key Switch Input Key Switch On
10 CAT Data Link (+) CAT HIGH
20 CAT Data Link (-) CAT LOW
33 Switch to Ground Input Steering/Transmission Lock (NC)
34 Switch to Ground Input Steering/Transmission Lock (NO)
(1) System-specific pin locationsInputs
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 2 g03375133
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).Pressure Sensors
Implement/Steering Pump Pressure Sensor
Illustration 3 g03375142The implement/steering pressure sensor sends a PWM signal to the Implement ECM indicating system pressure. The duty cycle of the signal will vary in proportion to the system pressure. These PWM signals are inputs to the Implement ECM.Pressure Sensors
Steering Pressure Reduction Sensor
Illustration 4 g03375142The steering pressure reduction sensor sends a PWM signal to the Implement ECM indicating system pressure. The duty cycle of the signal will vary in proportion to the system pressure. These PWM signals are inputs to the Implement ECM.Switches
Switches provide one of the following types of inputs to the ECM:
Open
Ground
+BatterySwitches are devices that have two states, opened or closed.
When a switch is open, no signal is provided to the corresponding input of the ECM. This condition is also referred to as floating.
When a switch is closed, a ground signal or a +battery signal is provided to the ECM.Steering and Transmission Lock
Illustration 5 g03375229The switch tells the ECM when the operator has the lock lever in the locked position.
Table 4
Switch Status
Switch Position Normally Open Normally Closed
Locked Closed Open
Unlocked Open Closed 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 .Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port to communicate with the Caterpillar Electronic Technician. A data link connection is provided for