FRAME AS-MAIN 3561074 - 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.Test Step 1. Check for Normal Operation of the Maintenance Due Lamp
Monitor the maintenance due lamp.
Turn the keyswitch to the ON position. The maintenance due lamp should turn on for five seconds. Then, the lamp should turn off.Note: The lamp will only turn off if a condition that requires maintenance does not exist.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. Check the bulb. Replace the bulb if the bulb is not OK. If the bulb is OK, proceed to Test Step 2.Test Step 2. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
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Left side view (1) P61 customer connector (2) J1/P1 ECM connectors
Thoroughly inspect connectors (1) and (2). Inspect the connections on the maintenance due lamp. Refer to Troubleshooting, "Electrical Connectors - Inspect".
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P1 terminals that are associated with the maintenance due lamp (P1-13) Maintenance due lamp
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J61 and P61 terminals that are associated with the maintenance due lamp (13) Maintenance due lamp
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the maintenance due lamp.
Check the allen head screw on the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and wiring for abrasions and for pinch points from the maintenance due lamp to the ECM.Expected Result:All of the connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and the wiring are OK. Proceed to Test Step 3.
Not OK - There is a problem with a connector and/or the wiring.Repair: Repair the connector and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved.STOPTest Step 3. Test the Maintenance Due Lamp Circuit at the ECM Connector
Disconnect the J1/P1 connectors.
Connect a jumper wire between terminal P1-30 and engine ground.
Turn the keyswitch to the ON position. Observe the maintenance due lamp.
Remove the jumper wire and observe the maintenance due lamp.Expected Result:The maintenance due lamp turned on while the jumper was connected. The maintenance due lamp turned off when the jumper was removed.Results:
OK - The maintenance due lamp turned on while the jumper was connected. The maintenance due lamp turned off when the jumper was removed. The maintenance due lamp circuit is functioning properly. Proceed to Test Step 6.
Not OK - The maintenance due lamp did not turn on. There is a problem with the circuit for the maintenance due lamp. Proceed to Test Step 4.Test Step 4. Test the Circuit at the Maintenance