ENGINE AR-COMPLETE 4843457 - Caterpillar

Illustration 1 g00885754
P1 ECM connector
Thoroughly inspect the harness connector J1/P1 and the Customer Connector J3/P3. Also inspect the connections for the battery and the connections to the keyswitch. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the following connections:
P1:4 and P1:6 (Unswitched positive battery)
P1:5 and P1:11 (Negative battery)
P1:23 (Switched positive battery)
P1:14 (Remote Shutdown Switch)
Check the ECM connector (allen head screw) for the proper torque of 2.25 N m (20 lb in).
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM. Also, check the harness and wiring for abrasions and for pinch points from the keyswitch to the ECM.Expected Result:All connectors, pins, and sockets should be completely coupled and/or inserted. The harness and wiring should be free of corrosion, abrasion, and/or pinch points.Results:
OK - All connectors and wiring is proper. Proceed to Test Step 2.
Not OK - There is a problem with the connectors 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. Stop.Test Step 2. Check the Battery Voltage at the ECM
168-02, System Voltage intermittent
Disconnect engine harness connector P1 from ECM connector J1 and insert a 40-Pin Breakout T.
Reconnect the harness.
Turn the keyswitch ON.
Measure the voltage between terminal 4 (Unswitched positive battery) and terminal 5 (Negative battery).
Measure the voltage between terminal 6 (Unswitched positive battery) and terminal 11 (Negative battery).
Measure the voltage between terminal 23 (Switched positive battery) and terminal 5 (Negative battery).Expected Result:The measured voltage is between 11.0 VDC and 13.5 VDC for a 12 volt system and between 22.0 VDC and 27.0 VDC for a 24 volt system with no suspected intermittent problems at this time.Results:
OK - The ECM is receiving the correct voltage. Repair: If an intermittent condition is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect". Stop.
Battery Voltage is out of range - Proceed to Test Step 3.
Intermittent Or No Voltage - Proceed to Test Step 4.
Switched Voltage Out Of Range - Repair: Trace the wiring for the keyswitch from the ECM through the keyswitch circuit to the batteries. Find the problem and repair the problem. Check the circuit protection for the circuit and for the wiring.Verify