BOLT-WHEEL 4724773 - Caterpillar

Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
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Engine view (typical example) (1) J1/P1 ECM connector
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Engine view (typical example) (2) J61/P61 customer connectors
Thoroughly inspect connectors (1) and (2). Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for details.
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P1 terminals that are associated with the indicator lamps (P1-19) Diagnostic lamp (P1-20) Warning lamp (P1-21) Maintenance indicator lamp (P1-28) Low oil pressure lamp (P1-29) High coolant temperature lamp (P1-30) Engine coolant level indicator lamp (P1-53) +Battery (P1-63) −Battery (P1-70) Keyswitch
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J61/P61 terminals that are associated with the indicator lamps (3) −Battery (8) +Battery (20) Engine coolant level indicator lamp (21) High coolant temperature lamp (22) Maintenance indicator lamp (23) Low oil pressure lamp (24) Diagnostic lamp (25) Warning lamp (30) Keyswitch
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. Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
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 are 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 illuminate for five seconds. Then, the indicator lamps do not illuminate.Results:
OK - The indicator lamps illuminate for five seconds. Then, the indicator lamps do not illuminate.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 diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - An indicator lamp does not illuminate. 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