FLANGE 7K1423 - Caterpillar

Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points. 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 Active Diagnostic Codes
Connect Cat ET to the service tool connector.
Restore electrical power to the ECM.
Turn the start/run/stop switch to the START position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes for the start relay. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Turn the start/run/stop switch to the STOP position. Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active, but a problem is suspected in the starting system. Proceed to Test Step 6.
Not OK - A -5 diagnostic code is active at this time. Proceed to Test Step 4.
Not OK - A -6 diagnostic code is active at this time. Proceed to Test Step 3.Test Step 3. Create an Open Circuit at the Start Relay
Disconnect the wires from terminal 3 and terminal 4 on the start relay. Ensure that the wires are isolated from engine ground and other sources of electrical power.
Turn the start/run/stop switch to the START position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes for the start relay. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Check for a -5 diagnostic code for the start relay. Note: Wait at least 30 seconds in order for the diagnostic code to become active.
Turn the start/run/stop switch to the STOP position. Expected Result:A -5 diagnostic code is now active for the start relay.Results:
OK - A -5 diagnostic code became active after disconnecting the wires. A -6 diagnostic code was active before disconnecting the wires.Repair: The harness and the ECM are OK. There is a problem with the start relay. Replace the start relay. Verify that there are no active diagnostic codes for the new start relay. Clear any logged diagnostic codes.STOP
Not OK - A -6 diagnostic code remains active. There is a short between the start relay and the ECM. There may be a problem with the ECM. Leave the wires for the start relay disconnected. Proceed to Test Step 5.Test Step 4. Create a Short at the Connector for the