RING-SNAP 8B7789 - Caterpillar

The electronic systems monitor the operating parameters of the engine. The systems can initiate responses if a specific parameter exceeds an acceptable range. The systems perform the following functions:Electronic Ignition System (EIS)
The EIS monitors the engine for detonation. If detonation occurs, the EIS control module will retard the timing. If the detonation continues, the EIS control module will request a shutdown. The system that receives the request for a shutdown varies depending on the engine's configuration.If the engine is equipped with a Remote Control Panel (Status), the request for a shutdown is sent to the Status Control Module (SCM). The SCM will terminate the flow of fuel. The SCM will also send a request to the EIS control module in order to terminate the ignition.If the engine is not equipped with a Remote Control Panel (Status), the request for a shutdown is sent to the customer's equipment. The customer's equipment must terminate the fuel flow. The customer's equipment must also send a request to the EIS control module in order to terminate the ignition.Air/Fuel Ratio Control
The air/fuel ratio control monitors the engine for an overspeed condition. An overspeed condition occurs when the signal from the speed sensor indicates that the engine speed is greater than 2000 rpm. An engine overspeed will cause the ECM to perform these actions:
Activate a 523-00 diagnostic code.
If the engine is equipped with a Remote Control Panel (Status), the ECM sends a request for a shutdown to the Status Control Module (SCM). The SCM sends a command to the EIS control module in order to terminate the ignition. The SCM also stops the flow of fuel.
If the engine is not equipped with a Remote Control Panel (Status), the ECM sends a request for a shutdown to the customer's equipment. The customer's equipment must terminate the fuel flow. Additionally, the customer's equipment must send a request to the EIS control module in order to terminate the ignition.Remote Control Panel (Status)
The remote control panel (status) provides protection against the following conditions:
Low oil pressure
High oil temperature
Overspeed
OvercrankWhen one of the above faults occurs, the SCM sends a command to the gas shutoff valve in order to stop the flow of fuel. If the engine does not shut down, the SCM sends a command to the EIS control module in order to terminate the ignition.When an emergency stop button is pressed, the SCM immediately sends commands in order to terminate the fuel flow and the ignition.For more information, refer to Systems Operation/Testing and Adjusting, SENR6420, "REMOTE CONTROL PANEL (STATUS) G3500 & G3400 ENGINE ".