MOUNT-FLEXIBLE 0772792 - Caterpillar

System Operation Description:The control module for the Electronic Ignition System (EIS) has an input for terminating the ignition. When the input is an open circuit, ignition is terminated. When the input is connected to ground, ignition will occur, if necessary.There are no diagnostics for the input for ignition shutdown. However, the control module will generate a 331-11 diagnostic code for these conditions:
A normal shutdown is initiated and the actual rpm does not decrease by 100 rpm within five seconds.
More than five seconds are required for the engine speed to decrease from 100 rpm to zero rpm.There is an additional diagnostic feature if the engine is equipped with the optional Status Control Module (SCM). The SCM monitors an engine speed sensor. A 331-11 diagnostic code will be generated when both of the following conditions are true:
The SCM detects an engine speed of zero rpm.
The EIS control module detects an engine speed that is above 100 rpm.When both of these conditions are true, the following events occur:
The SCM terminates the flow of fuel.
The SCM opens the circuit for ignition shutdown.
The EIS control module terminates the ignition.
The EIS control module generates a 331-11 diagnostic code.This situation can be caused when too many devices are connected to the speed sensor for the SCM.The circuit for ignition shutdown includes the emergency stop button. Pressing the emergency stop button opens the circuit for ignition shutdown. The ignition is immediately terminated.
Illustration 1 g01045587
Schematic diagram of the circuit for ignition shutdownThe engine is not equipped with a remote control panel.
Illustration 2 g01045588
Schematic diagram of the circuit for ignition shutdownThe engine is equipped with a remote control panel that includes a status control module.
Illustration 3 g01045589
Schematic diagram of the circuit for ignition shutdownThe engine is configured for Canadian Standards Association (CSA).Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
EIS connectors for the EIS control module
Connections for each emergency stop switch
Connections on the back of the SCM (if equipped)
Shutdown relays and/or switches that are provided by the customer
Illustration 4 g01045997
Harness side of the EIS connector (EISC-B) −Battery (EISC-L) Input for ignition shutdown
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the ignition shutdown.
Check the terminal strips for corrosion and for mechanical failure.
If the engine is equipped for CSA, check the harnesses and the wiring for abrasion and for pinch points between the device that requests ignition shutdown and the EIS control module.Expected Result:The connectors, pins, and sockets are connected properly. The terminal strips do not have corrosion or mechanical failure. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace