LINE AS-FUEL 3978294 - Caterpillar

Illustration 1 g01255307
Typical circuit for the auxiliary brake output
Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 2 g01186024
Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect J1/P1 ECM connector. Also, thoroughly inspect the firewall bulkhead connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01255305
Terminal locations at the P1 ECM connector for the auxiliary brake
(P1-12) Output No. 3
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the auxiliary brake circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the circuit's wiring for abrasion and for pinch points. 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 harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the wiring or replace the wiring, if necessary. Repair the connectors or replace the connectors, if necessary. Ensure that all of the seals are in the proper place. Ensure that all of the connectors are connected properly. Verify that the problem is resolved.STOPTest Step 2. Check the Parameter Settings
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch