HARNESS AS-ENGINE 4182085 - Caterpillar

Illustration 1 g01067592
Schematic
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P1 ECM connectorTest Step 1. Inspect the Electrical Connectors and the Wiring
Turn the ECS to the OFF/RESET position.
Turn the battery disconnect switch to the OFF position.
Thoroughly inspect J1/P1 and J2/P2 (ECM connectors). Inspect all of the other connectors. Refer to the diagnostic functional test 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:
P1:06 (+Battery)
P1:05 (-Battery)
P1:14 (Start/run/stop 1)
P1:13 (Start/run/stop 2)
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (53 lb in).
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, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring. Stop.Test Step 2. Check the Voltage to the ECM
Remove J1/P1 (ECM connector).
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position.
Measure the voltage between P1:06 (+Battery) and P1:05 (-Battery).
Turn the ECS to the OFF/RESET position.
Turn the circuit breaker for the battery to the OFF position.
Reconnect J1/P1 (ECM connector).Expected Result:The voltage is 25 2 VDC.Results:
OK - The ECM is receiving the correct voltage. Proceed to Test Step 6.
Not OK - The voltage is incorrect. The battery or the alternator may be causing the problem.Repair: Repair the wiring or replace the wiring between the ECM and the battery. Verify that the repair has eliminated the problem. If the problem has not been eliminated, proceed to Test Step 3.Test Step 3. Check the Battery Voltage
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Measure the no-load battery voltage at the battery terminals.
Load test the batteries. Use the 4C-4911 Battery Load Tester. Refer to the Operating Manual, SEHS9249. Refer to Special Instruction, SEHS7633.Expected Result:The no-load voltage at the batteries is at least 23.5 VDC, and the batteries pass the load test.Results:
OK - The batteries are not the problem. Proceed to Test Step 4.
Not OK - The battery voltage is incorrect and/or the battery fails the load test.Repair: The batteries or the alternator are causing the problem. Recharge the batteries or replace the batteries. Verify that the original condition is resolved. If the problem has not been eliminated, proceed to Test Step 4.Test Step 4. Check the Voltage at the Engine Control Switch (ECS)
Reconnect J1/P1 (ECM connector).
Turn the ECS to the STOP position. Measure the voltage between wire 229-BK-14 (ECM ground connection) and the following terminals of the ECS:
Terminal 1
Terminal 3
Terminal 4
Terminal 5
Perform the same test with the ECS in the START, and in the AUTO and in OFF/RESET positions.Expected Result:The voltage is 25 2 VDC