CONNECTION AS 2289897 - Caterpillar

Illustration 1 g01346566
Schematic for the electrical power supply circuit
Illustration 2 g01325674
A typical view of the P1 connector (harness side) pin locations. (1) − Battery (2) − Battery (3) − Battery (7) + Battery (8) + Battery (9) − Battery (10) − Battery (15) + Battery (16) + Battery (40) Ignition key switchTest Step 1. Inspect Electrical Connectors and Wiring
Remove the electrical power from the ECM.
Thoroughly inspect connector P1, the battery connections, and the connections to the keyswitch. Refer to service Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the electrical power supply.
Check the allen head screw on each ECM connector for the proper torque. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Check the harness for abrasion and for pinch points from the battery to the ECM, and from the keyswitch to the ECM.Expected Result:All connectors, pins, and sockets are correctly coupled and/or inserted and the harness is 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 fault with the connectors and/or the harness.Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly coupled.If applicable, use Cat ET to perform the "Wiggle Test" on the wires that are associated with the electrical power supply.Use Cat ET in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Check the Battery Voltage at the ECM Connector
Disconnect P1 from the ECM connector.
Restore the electrical power to the ECM.
Measure the voltage between P1-7 (Unswitched +Battery) and P1-1 (-Battery).
Measure the voltage between P1-8 (Unswitched +Battery) and P1-2 (-Battery).
Measure the voltage between P1-15 (Unswitched +Battery) and P1-9 (-Battery).
Measure the voltage between P1-16 (Unswitched +Battery) and P1-10 (-Battery).
Measure the voltage between P1-40 (keyswitch) and P1-3 (-Battery).
Remove the electrical power from the ECM.Expected Result:The measured voltage is a constant 22 VDC to 27 VDC with no suspected intermittent faults at this time.Results:
OK - The ECM is receiving the correct voltage. Repair: If an intermittent condition is suspected, refer to service Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The voltage for the keyswitch is out of the acceptable range. Proceed to Test Step 4.
Not OK - The unswitched power is out of the acceptable range. Proceed to Test Step 3.Test Step 3. Check the Batteries
Measure no-load battery voltage at the battery terminals.
Load-test the batteries. Use a suitable battery load tester.Expected Result:The batteries pass the load test. The measured voltage is the minimum specification.Results:
OK - The batteries pass the load test. Repair: The batteries are OK. There is an open circuit or excessive resistance in the wiring or connections between the batteries and the ECM. Verify that the circuit breaker for the ECM is not tripped. Verify that the connection at the engine ground stud is clean