852760 Mercury FITTING (STRAIGHT)

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(21) - Battery (31) Engine shutdownTest Step 1. Inspect Electrical Connectors and Wiring
Turn the engine control switch to the OFF position.
Thoroughly inspect the J14/P14 connector.Thoroughly inspect the J17/P17 connector. The connectors should be free of abrasions, corrosion and pinch points. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the engine shutdown switch.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Check the harness for abrasions and for pinch points from the battery to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points. Proceed to Test Step 2.
NOT OK - There is a problem in the connectors and/or wiring.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 completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Switch Status with Caterpillar Electronic Technician (ET)
Turn the engine control switch to the OFF position.
Connect to the service tool connector.
Turn the engine control switch to the ON position.
Toggle the engine shutdown switch. Observe the status on Cat ET.Expected Result:The status reads "RUN" when the switch is in the RUN position. The status reads "STOP" when the switch is in the STOP position.Results:
OK - The status reads "RUN" when the switch is in the RUN position. The status reads "STOP" when the switch is in the STOP position.Repair: The shutdown input is functioning properly. Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information.STOP
NOT OK - The status does not read "RUN" when the switch is in the RUN position. The status does not read "STOP" when the switch is in the STOP position. Proceed to Test Step 3.Test Step 3. Short the Inputs at the Connector
Turn the engine control switch to the OFF position.
Remove wire B450-BU from P17-14 and leave the wire disconnected.
Turn the engine control switch to the ON position.
Observe the status of the engine shutdown switch on Cat ET.
Turn the engine control switch to the OFF position.
Short wire B450-BU to the battery negative. Use an ohmmeter to verify the connection.
Observe the status of the engine shutdown switch on Cat ET.
Turn the engine control switch to the OFF position.Expected Result:The status reads "RUN" when the wire is disconnected. The status reads "STOP" when the wire is connected.Results:
OK - The status reads "RUN" when the wire is disconnected. The status reads "STOP" when the wire is connected. Repair: The ECM and the harness are functioning properly. The customer wiring and the junction box are the source of the problem.STOP
NOT OK - The status does not read "RUN" when the wire is disconnected. The status does not read "STOP" when the wire is connected. Proceed to Test Step 4.Test Step 4. Short The Switch Inputs At The ECM
Turn the engine control switch to the OFF position.
Remove wire B450-BU from P14-17 and leave the wire disconnected.
Turn the engine control switch to the ON position.
Observe status of the engine shutdown switch on Cat ET.
Install Deutsch connectors on a 203 mm (8 inch wire).
Connect the wire between P14-17 and the battery negative.
Observe the status of the engine shutdown switch on Cat ET.Expected Result:The status of the engine shutdown switch reads "RUN" when the wire is not installed. The status of the engine shutdown switch reads "STOP" when the wire is installed. Results:
OK - The status of the engine shutdown switch reads "RUN" when the wire is not installed. The status of the engine shutdown switch reads "STOP" when the wire is installed.Repair: The ECM reads the inputs properly. There is a problem in the harness or the junction box.STOP
NOT OK - The status of the engine shutdown switch does not read "RUN" when the wire is not installed. The status of the engine shutdown switch does not read "STOP" when the wire is installed.Repair: The ECM is not reading the inputs correctly. Replace the ECM. Refer to Troubleshooting, "ECM - Replace" for further information.STOP