CONTROL GP-HANDLE 2602127 - Caterpillar

COLSPAN="2">Typical air shutoff circuitNote: The Engine Control Switch (ECS) is mounted within an instrument panel that is located on the right side of the engine. The ECS is locked into the AUTO position with a pin. The pin must be removed in order to perform this test. After performing this test, ensure that the ECS is placed in the AUTO position and that the locking pin has been reinstalled.Test 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 6.0 N m (55 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 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, abrasion or 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. Stop.Test Step 2. Test the Air Shutoff System.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the OFF/RESET position.
Connect the Caterpillar Electronic Technician (ET).
Turn the ECS to the STOP position. The engine should be off.
Access the override on the Cat ET. Activate the override for the air shutoff.
Disable the override for the air shutoff.Expected Result:The air shutoff relay should activate. The air shutoff relay should deactivate after 1.5 seconds. While the relay is active, the air shutoff solenoid should also be active.Results:
OK - The air shutoff solenoid activated correctly.Repair: The problem may be intermittent. If the problem is intermittent, perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors". Stop.
Not OK - The air shutoff solenoid failed to activate. Proceed to test step 3.Test Step 3. Test for Voltage from the Air Shutoff Relay.
Turn the ECS to the OFF/RESET position.
The output to the solenoids is terminal 30 on the air shutoff relays. The wires to the solenoids are 395-BR and 394-GN. Connect a voltmeter between terminal 30 on the air shutoff relay and the - Battery terminal.
Turn the ECS to the STOP position. The engine should be off.
Access the override on the Cat ET. Activate the override for the air shutoff. Monitor the voltage on the voltmeter.
Disable the override for the air shutoff.
If a second air shutoff relay is installed, repeat the above steps for the other air shutoff relay.Expected Result:The voltage should measure