PLATE 5K3171 - Caterpillar

System Operation Description:This procedure checks the circuit for the engine running output for proper operation. There are no diagnostic codes for this output.Background InformationThe "Engine Running Output" activates when the engine is running. This can be used to prevent the engagement of the starting motor while the engine is running. The Engine Control Module (ECM) can be connected to a relay that disables the starter. The relay is normally closed so cranking can be achieved immediately at powerup. During cranking, the ECM energizes the output for the "Engine Running Output" once engine rpm reaches 50 rpm below low idle. The output is de-energized when the engine speed falls by 100 rpm below the programmed low idle. The low idle rpm is programmable. The range for low idle is between 600 rpm and 750 rpm.The "Engine Running Output" parameter can be programmed to J1/P1:10, J1/P1:12, or J1/P1:13.
Illustration 1 g00656153
Schematic for the engine running output
Test Step 1. Inspect the Electrical Connectors and the Wiring
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Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect the J1/P1 ECM connector and the firewall bulkhead connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
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Terminal locations at the P1 ECM connector for the engine running output
(P1-10) Output No. 2
(P1-12) Output No. 3
(P1-13) Output No. 4
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the relay 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 harness and wiring for abrasion and for pinch points from the relay to the ECM. 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 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. Determine the Configuration of the Engine Running Output
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Use Cat ET to check the configuration parameter for "Engine Running Output". Record the parameter setting.
Verify that the "Engine Running Output" parameter is programmed to reflect the current