TUBE 4165684 - Caterpillar

Illustration 1 g01080837
Schematic for the warning lampThe ECM provides a path to ground for the lamp. When the ECM connects the lamp to ground the lamp will turn on.
Illustration 2 g00741073
Terminal locations for customer connectorTest Step 1. Check for Normal Operation of the Warning Lamp
Monitor the warning lamp.
Place the engine control in the ON mode and observe the lamp. The lamp should turn on for five seconds. Then, the lamp should turn off.Note: The lamp will turn off only if a "Warning", "Derate", or a "Shutdown" condition does not exist.Expected Result:The warning lamp turns on and the warning lamp turns off.Results:
Yes - The warning lamp appears to be operating correctly at this time.STOP
No - The warning lamp did not work properly. 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 connector wires in the circuit that are associated with the maintenance overdue 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.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.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
Illustration 3 g00741089
Terminal locations for the warning lamp
Disconnect ECM engine harness connector J1/P1.
Remove wire F420-GN from ECM connector P1-29.
Connect a wire jumper between wire F420-GN and engine ground.
Place the engine control in the ON mode and observe the lamp.Expected Result:The warning lamp turns on while the jumper is connected to wire F420-GN. Also, the warning lamp turns off when the jumper is removed from wire F420-GN.Results:
OK - The circuit for the