PANEL GP-CONTROL 1798801 - Caterpillar

Switch to the Air Shutoff Solenoids
Turn the ECS to the OFF/RESET position.
Disconnect wire G708 from the "ASOS" switch.
Connect a voltmeter to the empty terminal on the "ASOS" switch. Connect the other lead from the voltmeter to engine ground.
Turn the ECS to the STOP position.
Activate the local emergency stop switch.
Monitor the voltage on the voltmeter.
Deactivate the local emergency stop switch.
Reconnect wire G708 to the "ASOS" switch.Expected Result:The voltage measures 24 3 VDC for approximately 2.5 seconds.Results:
OK - The voltage measures 24 3 VDC for approximately 2.5 seconds. The circuit is operating correctly to this point.Repair: Repair the wire G708 between the "ASOS" switch and wire G708 on pin I at connector P-C1 of the rigid harness.STOP
Not OK - The voltage did not measure 24 3 VDC for approximately 2.5 seconds.Repair: Verify that 24 3 VDC is present on wire K708 at the normally open contacts of the "ASOS" switch. If voltage is not present on wire K708, check the wire K708 and the circuit breaker for the air shutoff for problems. If voltage is present on the wire K708, check wire 220 on the coil of the "ASOS" switch for continuity to the −Battery. If necessary, repair the wire or replace the wire. If wire 220 is OK and voltage is present on wire K708, replace the "ASOS" switch.STOPTest Step 7. Check the Voltage at the Connector for the Air Shutoff Solenoids
Turn the ECS to the OFF/RESET position.
Disconnect the connector for the air shutoff solenoids. Disconnect the connector for the right and left sides of the engine.
Connect a voltmeter between wire G708 on the connector for the air shutoff solenoid and the engine ground.
Turn the ECS to the STOP position.
Activate the local emergency stop switch.
Monitor the voltage on the voltmeter.
Deactivate the local emergency stop switch.
Reconnect the connectors for the air shutoff solenoids.Expected Result:The voltage measures 24 3 VDC for approximately 2.5 seconds.Results:
OK - The voltage measures 24 3 VDC for approximately 2.5 seconds. The circuit is operating correctly to this point.Repair: Check the wire H708 from terminal A of the connector for continuity to the −Battery. If the wire H708 does not have continuity to the −Battery from terminal A of the connector, check for continuity on wire H708 on pin H at connector P-C1 of the rigid harness to −Battery. If the wire H708 does not have continuity to the −Battery from pin H at connector P-C1 of the rigid harness, verify that the breaker for the prelube and air shutoff is not tripped. If the wire H708 to the −Battery terminal is OK, replace the air shutoff solenoid. Verify that the circuit operates correctly.STOP
Not OK - The voltage did not measure 24 3 VDC for approximately 2.5 seconds. System voltage was not available at the solenoid connector.Repair: There is a problem in the wiring between the connector for the air shutoff solenoids and wire G708 on pin I at connector P-C1 of the rigid harness. Repair the connectors or wiring