MIRROR GP-REAR VIEW 3000560 - Caterpillar

System Operation Description:When the emergency stop switch on the instrument panel is activated, power is removed from the Electronic Control Module (ECM). When the emergency stop switch is activated, the air shutoff solenoids will activate. The air shutoff solenoids shut the valves that block intake air to the engine. The engine then shuts down. A lockout system is incorporated into the circuit which prevents power from being restored to the ECM in case the emergency stop switch is deactivated accidentally. The emergency stop switch must be deactivated and the Engine Control Switch (ECS) must be turned to the OFF/RESET position in order to restart the engine. In addition, the air shutoff valves must be manually opened in order for the engine to be restarted.When the emergency stop switch is activated, the emergency stop relay opens removing voltage to the coils of the primary ECM relay and the secondary ECM relay. The ECM relays remove battery voltage to the primary ECM and to the secondary ECM. Injection signals to the injectors will stop. This will cause the engine to stop. If the emergency stop switch is activated, the emergency stop relay (Lockout) will activate. When the emergency stop switch is deactivated, the emergency stop relay (Lockout) will stay energized through the normally open contacts of the relay. The circuitry prevents power from being restored to the ECM in case the emergency stop switch is deactivated accidentally.Note: The remote emergency stop switch may affect the operation of the engine.
Illustration 1 g00973881Test Step 1. Check for Connector Damage.
Verify that the circuit breakers are not tripped.
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
Check the ECM connectors (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the customer connectors (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Test the Emergency Stop Circuit.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position. The engine should be off.
Activate the emergency stop switch that is located on the instrument panel.
Monitor the air shutoff solenoids. Expected Result:The air shutoff relays should activate.Results:
OK - The air shutoff solenoids activated correctly.Repair: The problem may be intermittent.