SUPPORT 2941800 - Caterpillar

Illustration 1 g01122447
Schematic for the warning lampThe ECM provides a path to ground for the warning lamp. When the ECM connects the warning lamp to ground the warning lamp will turn on.Test Step 1. Check for Normal Operation of the Warning Lamp
Monitor the warning lamp.
Turn the keyswitch to the ON position. The warning lamp should turn on for five seconds. If the warning lamp does not turn on, check that the bulb is not burned out or check that no breakers are tripped. After five seconds, the lamp should turn off. If the warning lamp does not turn off, check for an event code.Note: The lamp will only turn off only if a "Warning", a "Derate", or a "Shutdown" condition does not exist.Expected Result:The warning lamp turns on and the warning lamp turns off per the above description.Results:
OK - The warning lamp appears to be operating correctly at this time.STOP
Not OK - The warning 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.
Illustration 2 g01119456
Left side view (1) P61 customer connector (2) J1/P1 ECM connectors
Thoroughly inspect connectors (1) and (2). Inspect the connections on the warning lamp. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01216602
P1 terminals that are associated with the warning lamp (P1-29) Warning lamp
Illustration 4 g01216603
J61 and P61 terminals that are associated with the warning lamp (25) Warning lamp
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the warning lamp.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and wiring for abrasions and for pinch points from the warning 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 Warning Lamp Circuit at the ECM Connector
Disconnect the J1/P1 connectors.
Connect a jumper wire between terminal P1-29 and engine ground.
Turn the keyswitch to the ON position. Observe the warning lamp.
Remove the jumper wire and observe the warning lamp.Expected Result:The warning lamp turned on while the jumper was connected. The warning lamp turned off