WASHER 2G5673 - Caterpillar

System Operation Description:Use this procedure in order to troubleshoot the electrical system if a problem is suspected with the remote emergency stop switch. Use this procedure if the diagnostic code in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
337-2 Incorrect Remote E-Stop Switch inputs The two inputs from the remote emergency stop switch are in the opposite state. The code is logged. The remote emergency stop switch sends two signals to the Electronic Control Module (ECM). The signals are used to determine if the remote emergency stop switch is active. The remote emergency stop switch is active when the switch is in the open state and the two signals are high. The remote emergency stop switch is inactive when the switch is in the closed state and the two signals are held low.If the ECM is powering up and one of the signals from the remote emergency stop switch is in a different state from the other signal, the ECM determines that one of the signals is faulty. If one of the signals from the remote emergency stop switch is in a different state from the other signal, the ECM will generate a diagnostic code that remains active until power to the ECM is cycled. The ECM will not allow the crank cycle to begin if the signals are opposite of each other. The ECM will allow the engine to be started manually in this state.The ECM monitors the remote emergency stop signals at all times. If the engine is running and one of the signals from the remote emergency stop switch changes states, the engine will continue to run. The ECM initiates an emergency stop shutdown only when both signals are high during engine operation.When an emergency stop signal is received by the ECM, the ECM will activate the output for the relay that controls the air shutoff valve. When the solenoid valve activates, the air shutoff valve closes removing the intake air from the engine.The switch at the air shutoff valve allows the ECM to determine if the air shutoff valve is open or closed. If the shutoff valve is closed, the switch is in the closed position and the ECM will not start the engine. The air shutoff valve must be manually opened in order to start the engine.The ECM will not allow the starting sequence to begin when the remote emergency stop switch is activated. The engine will not be able to restart until the following conditions are met:
The engine rpm must equal zero.
The remote emergency stop inputs must go low.
The ECM has been reset.The electrical power to the input for the keyswitch must be turned OFF for three seconds in order to reset the engine ECM after an emergency stop condition.Note: If one of the signals from the remote emergency stop switch is in a different state from the other signal, the Caterpillar Electronic Technician (ET) will display the warning "INVALID DATA".
Illustration 1 g01218360
Typical schematic
Illustration