STICK GP-HOE 2444156 - Caterpillar

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Schematic for the maintenance due lampThe ECM provides a path to ground for the lamp. When the ECM connects the lamp to ground the lamp will turn on.
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Terminal locations for the customer connectorTest Step 1. Check for Normal Operation of the Maintenance Due Lamp
Monitor the maintenance due lamp.
Place the engine control in the ON mode. The lamp should turn on for five seconds. Then, the lamp should turn off.Expected Result:The maintenance due lamp turns on and the maintenance due lamp turns off per the above description.Results:
OK - The maintenance due lamp appears to operating correctly at this time.STOP
Not OK - The maintenance due lamp is not functioning correctly. Proceed to Test Step 2.Test Step 2. Inspect Electrical Connectors and Wiring
Place the engine control in the OFF/RESET mode and thoroughly inspect the J61/P61 customer connector and J1/P1 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the customer connector and the ECM connector that are associated with the maintenance due lamp.Refer to Illustration 1.
Check the J61/P61 customer connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the ECM connector J1/P1 for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 3.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 3. Test the Lamp Circuit
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Terminal locations for the maintenance due lamp
Disconnect ECM engine harness connector J1/P1.
Remove wire F424-YL from ECM connector P1-30.
Connect a wire jumper between wire F424-YL and engine ground.
Place the engine control in the ON mode and observe the lamp.Expected Result:The maintenance due lamp turns on while the jumper is connected to wire F424-YL. Also, the maintenance due lamp turns off when the jumper is removed from wire F424-YL.Results:
OK - The maintenance due lamp circuit is functioning properly. Proceed to Test Step 6.
Not OK - The lamp did not turn on. The lamp circuit is not functioning properly. Proceed to Test Step 4.Test Step 4. Test the Lamp Circuit at the Lamp
Remove wire F424-YL from the lamp.
Connect a wire jumper between the lamp and engine ground.
Place the engine control in the ON mode and observe the lamp.Expected Result:The lamp turns on while the jumper is connected. Also, the lamp turns off when the jumper is removed.Results:
OK - The circuit for the lamp is functioning properly.Repair: Repair the wire F424-YL between the lamp and the ECM connector P1-30.STOP
Not OK - The lamp did not turn on. The lamp circuit is not functioning properly. Proceed to Test Step 5.Test Step 5. Check the Voltage from