SHIM 5H1522 - Caterpillar

Illustration 5 g03330533The steering position sensor is a frequency sensor that determines the angle of the steering system. The sensor sends an electrical pulse down a rod, and a magnetic ring moves up and down the rod as the steering system moves. The time between when the pulse is sent and when the pulse bounces back from the magnet adjust the frequency output of the sensor.Switches
Switches provide an open signal, a ground signal, or a +battery signal to the inputs of the ECM. Switches are open or closed.
When a switch is open, no signal is provided to the corresponding input of the ECM. The “no signal” condition is also called “floating”.
When a switch is closed, a ground signal or a +battery signal is provided to the corresponding input of the ECM.Secondary Steering System Switch
Illustration 6 g03325123The switch is a limit switch that alerts the ECM if the secondary steering system pressure exceeds the switch actuation point. The ECM contact for the switch floats to a high voltage state when the switch is open. When the switch closes, the voltage is pulled to a low voltage state. The switch is normally in a closed position.Secondary Steering Test Switch
Illustration 7 g03325168The secondary steering test switch is a single pole switch. The switch alerts the ECM that the operator would like to test the secondary steering system. The contact on the ECM for the secondary steering test switch floats to a high voltage state when the switch is open. When the switch is activated and the switch closes, the ECM contact is pulled into a low or ground voltage state.Steering Tank Oil Level Sensor
Illustration 8 g03330567The steering tank oil level switch is a fluid detection switch. The switch sends a signal showing either the presence or lack of steering oil at a certain level in the system. The switch has a seven second antislosh feature, and is used to alert the ECM that steering oil is low.Outputs
The ECM responds 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.Solenoids
Steering System Disable Solenoid
Illustration 9 g03324828The steering system disable solenoid is an On/Off solenoid which locks out the steering system. In the relaxed state of the solenoid, the steering system is active, when the ECM energizes the solenoid, the steering system is disabled.Note: The solenoid coils are not designed to operate using 24 DCV directly. The ECM sends a PWM signal of 24 V at a duty cycle that will provide the necessary current to the solenoid coils. Do NOT activate the coils by using 24 DCV (+battery). The life of the coils will be reduced drastically. A source of 12 DCV should be used, if the coils must be activated by not using the ECM. Relays
Secondary Steering Relay
Illustration 10 g03324979The secondary steering relay provides power to the secondary steering motor. The ECM can send a signal to the relay causing the relay to energize. When the relay is energized, battery