EDGE-CUTTING 4842299 - Caterpillar

This procedure checks the circuit for the engine shutdown output for proper operation. There are no diagnostic codes for this output.Background InformationThe "Engine Shutdown Output" allows the Engine Control Module (ECM) to shut down portions of the vehicle's electrical system at shutdown. This reduces the consumption of electrical power (battery drain) after the shutdown. The system activates a relay (engine shutdown relay) when the engine begins running. This permits the driver to turn the keyswitch to the OFF position without causing the engine to shutdown. When the shutdown delay time has expired for the idle shutdown timer feature, the ECM initiates the shutdown by removing power from the relay for the engine shutdown output. This interrupts the power to the ECM and the engine shuts down. The current draw on the batteries is then dependent on the items that are not powered through the relay circuit for the shutdown output.The "Engine Shutdown Output" parameter can be programmed to "J1/P1:10", "J1/P1:12", or "J1/P1:13".
Illustration 1 g01329026
Schematic for the engine shutdown 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 shutdown 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 Shutdown Output
Connect the 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 Shutdown Output". Record the parameter setting.
Verify that the "Engine Shutdown Output" parameter is programmed to reflect the current wiring for the circuit.
Turn the keyswitch to the OFF position. Expected Result: