CONTROL GP-JOYSTICK 5285704 - Caterpillar

Check the wire H708-BK(Black) from terminal A of the connector for the air shutoff solenoid for continuity to the −Battery terminal. If the wire H708-BK(Black) to the −Battery terminal is OK, replace the air shutoff solenoid.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: Repair the wire G708-BK(Black) between the connector for the air shutoff solenoids and terminal I at connector A-C90 of the rigid harness. Refer to Illustration 1 for a schematic of the circuit.STOPTest Step 8. Check the Voltage at the Contact of Relay "R3A"
Turn the ECS to the OFF/RESET position.
Disconnect wire T120-BK(Black) from terminal 87 of relay "R3A".
Connect a voltmeter between terminal 87 of relay "R3A" and the engine ground.
Turn the ECS to the STOP position.
Activate the customer's emergency stop switch.
Monitor the voltage on the voltmeter.
Deactivate the customer's emergency stop switch.
Reconnect wire T120-BK(Black). Expected Result:The voltage measures 24 3 VDC.Results:
OK - The voltage measures 24 3 VDC. Proceed to Test Step 9.
Not OK - The voltage did not measure 24 3 VDC. Proceed to Test Step 11.Test Step 9. Check the Voltage at Terminal 6 of the Connector for the Timer
Turn the ECS to the OFF/RESET position.
Remove wire T708 from terminal 6 of the connector for the timer.
Connect a voltmeter between terminal 6 of the connector for the timer and engine ground.
Turn the ECS to the STOP position.
Activate the customer's emergency stop switch.
Monitor the voltage on the voltmeter.
Deactivate the customer's emergency stop switch.
Return all wiring to the original configuration. 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. Proceed to Test Step 12.
Not OK - The voltage did not measure 24 3 VDC for approximately 2.5 seconds.Repair: Check for 24 3 VDC on terminal 3 of the connector for the timer. If voltage is not present on terminal 3, repair the wire T120-BK(Black) between terminal 87 of relay "R3A" and terminal 3 of the connector for the timer.If voltage is present on terminal 3 of the connector for the timer, verify that wire 220-BK(Black) on terminal 2 of the connector for the timer has continuity to the −Battery. If wire 220-BK(Black) does not have continuity to the −Battery, repair the wire. Verify that 24 3 VDC is present on terminal 1 of the connector for the timer. If 24 3 VDC is not present on terminal 1 of the connector for the timer, verify that the engine control switch is not in the "OFF/RESET" position. Verify that the "MPD" breaker is not tripped. Check the normally closed contact of relay "R1" for proper operation. Check the wire 120 between terminal 1 of the connector for the timer and relay "R1" for damage. Check the wire A120 between relay "R1" and the "MPD" breaker for damage. If necessary, repair the wires.If the voltage is present on terminal