HEAD 2239652 - Caterpillar

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Schematic for the lamps Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
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Typical engine view (1) J1/P1 ECM connector
Thoroughly inspect connectors (1) and (2). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
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P1 terminals for the indicator lamps (P1-28) Diagnostic indicator lamp (P1-29) Warning indicator lamp () Return
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the indicator lamps.
Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the customer connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and wiring for abrasions and for pinch points from the indicator lamps to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
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 2. Check for Normal Operation of the Lamp
Restore the electrical power to the ECM and monitor the indicator lamps.Expected Result:The indicator lamps turn on for five seconds. Then, the indicator lamps turn off.Results:
OK - The indicator lamps turn on for five seconds. Then, the indicator lamps turn off.Repair: The problem appears to be resolved. The original problem was probably caused by a poor electrical connection. If an intermittent problem is suspected, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - An indicator lamp does not turn on. Proceed to Test Step 3.Test Step 3. Measure the Voltage at the Lamp Socket
Use a test lamp to check for voltage at the suspect lamp socket within the first five seconds after the electrical power is restored.Expected Result:The test lamp illuminates during the first five seconds after the electrical power is restored.Results:
OK - The test lamp illuminates during the first five seconds after the electrical power is restored.Repair: Replace the bulb.Verify that the repair eliminates the problem.STOP
Not OK - The test lamp did not illuminate during the first five seconds after the electrical power was restored. Proceed to Test Step 4.Test Step 4. Bypass the ECM in order to Test the Lamp Circuit
Fabricate a jumper wire that can be used to connect two terminals at the P1 ECM connector. Crimp connector pins to both ends of the wire.
Disconnect the J1/P1 connectors.
Use the jumper wire to short one leg of the indicator lamp to the appropriate circuit connection. Refer to figure 3 or 1 for the appropriate terminals.
Restore the electrical power to the ECM and observe the indicator lamp.
Remove the jumper wire and observe the indicator lamp.Expected Result:The indicator lamp