CYL GP-BASIC 2645128 - Caterpillar

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Schematic for the diagnostic lampThe Electronic Control Module (ECM) provides a path to ground for the diagnostic lamp. When the ECM connects the diagnostic lamp to ground the diagnostic lamp will turn on.
Illustration 2 g00741104
Terminal locations for the customer connectorTest Step 1. Check for Normal Operation of the Diagnostic Lamp
Place the engine control in the ON mode while you monitor the diagnostic lamp.Expected Result:The diagnostic lamp turns on for five seconds. Then, the diagnostic lamp turns off. If a diagnostic code is active, the diagnostic lamp will flash.Results:
Yes - The diagnostic lamp appears to be operating correctly at this time.STOP
No - The diagnostic lamp is not operating 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 circuit that is associated with the diagnostic 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 (allen head screw) 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 with the connectors and/or with the 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 Diagnostic Lamp Circuit at the ECM Connector
Illustration 3 g00806996
Terminal locations for the diagnostic lamp
Disconnect ECM connector J1/P1.
Remove wire F404-RD from ECM connector P1-28.
Connect a wire jumper between wire F404-RD and engine ground.
Place the engine control in the ON mode and observe the diagnostic lamp.Expected Result:The diagnostic lamp turns on while the jumper is connected to wire F404-RD. Also, the diagnostic lamp turns off when the jumper is removed from wire F404-RD.Results:
OK - The circuit for the diagnostic lamp is functioning properly. Proceed to Test Step 6.
Not OK - The diagnostic lamp did not turn on. The diagnostic lamp circuit is not functioning properly. Proceed to Test Step 4.Test Step 4. Test the Diagnostic Lamp Circuit at the Diagnostic Lamp
Remove wire F404-RD from the diagnostic lamp.
Connect a wire jumper