818574 Mercury SEAL

Illustration 1 g01072580
PTO configuration "Cab Switches"
Illustration 2 g01072581
PTO configuration "Remote Switches"
Illustration 3 g01072584
PTO configuration "Cab Switches" or "Remote Switches"
Illustration 4 g01072585
Terminal locations at the ECMTest Step 1. Check the Electrical Connectors and the Wiring
Thoroughly inspect the ECM vehicle harness connector J1/P1, the connectors, and the firewall bulkhead connectors. 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 circuit for the torque limit switch.The wires are on the following terminals:
J1/P1-30
J1/P1-32
Check the allen head screws for the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and the wiring for abrasion and for pinch points from the battery to the ECM. Then, check from the keyswitch 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, or of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Use Cat ET to Check the Status of the Torque Limit Switch
Connect the Caterpillar Electronic Technician (ET) to the cab data link connector.
Turn the keyswitch to the ON position.
Operate the torque limit switch in the ON position and the OFF position.
View the "Torque Limit Switch" status on Cat ET.
If the "Torque Limit Switch" status indicates "Not Installed", then the "Torque Limit Switch" parameter has not been programmed.Expected Result:The status screen indicates "ON" when the switch is turned on. The status screen indicates "OFF" when the switch is off.Results:
OK - The switch is operating normally. Continue troubleshooting if the original condition is not resolved.STOP
Not OK - The ECM is not reading the "Switch Status" change. Proceed to Test Step 3.Test Step 3. Check the Switch Circuit at the ECM
Turn the keyswitch to the OFF position.
Install a 40-pin breakout T to the ECM vehicle harness connector J1/P1.
Fabricate a jumper wire that is long enough to create a test circuit across the connector for the breakout T. Crimp connector pins to each end of the jumper wire.
Insert the jumper wire into terminal 32 of the breakout T. Connect the other end of the jumper wire to terminal 30 (sensor return).
Connect Cat ET to the cab data link connector.
Turn the keyswitch to the ON position.
Alternately remove the jumper wire and then insert the jumper wire from terminal 30. At the same time, monitor the status screen on Cat ET.
Restore the wiring to the original configuration.Expected Result:The switch status changes to "ON" with the jumper wire in place. The switch status changes to "OFF" when the jumper wire is removed.Results:
OK - The ECM is functioning properly at this time. Proceed to Test Step 4.
Not OK - The ECM is not functioning properly.Repair: Perform the following repair:
Temporarily connect a test ECM.
Recheck the system for active diagnostic codes.
Repeat the Test Step.
If the problem is resolved with the test ECM, reconnect the suspect ECM.
If the problem returns with the suspect ECM, replace the ECM.
Verify that the repair eliminates the problem.STOPTest Step 4. Check for Proper Operation of the Torque Limit Switch
Turn the keyswitch to the OFF position.
Fabricate a jumper wire that is long enough to create a test circuit across the terminals of the torque limit switch.
Insert the jumper wire between the two switch terminals of the torque limit switch.
Turn the keyswitch to the ON position.
Alternately remove the jumper wire and then insert the jumper wire at the switch terminals. At the same time, watch the status screen on Cat ET.Expected Result:The switch status changes to "ON" with the jumper wire in place. The switch status changes to "OFF" when the jumper wire is removed.Results:
OK - Repair: Replace the torque limit switch.Verify that the repair eliminates the problem.STOP
Not OK - There is a problem in the wire harness between the torque limit switch and the ECM. Proceed to Test Step 5.Test Step 5. Check the Engine Harness at the Bulkhead Connector
Turn the keyswitch to the OFF position.
Fabricate a jumper wire that is long enough to create a test circuit across the bulkhead connector. Crimp connector pins to each end of the jumper wire.
Determine the terminal locations at the bulkhead connector that are for the torque limit switch.
Insert the jumper wire between the terminals that are for the switch circuit and the sensor return on the engine harness side of the bulkhead connector.
Turn the keyswitch to the ON position.
Alternately connect and then disconnect the jumper wire. At the same time, monitor the status screen on Cat ET.Expected Result:The switch status changes from "ON" with the jumper wire in place. The switch status changes to "OFF" when the jumper wire is removed.Results:
OK - The problem is in the vehicle wiring between the bulkhead connector and the torque limit switch. Inspect the vehicle wiring and then repair the vehicle wiring. Otherwise, send the vehicle to the OEM dealer for repair. Verify that the original condition is resolved.STOP
Not OK - The problem is in the engine harness between the bulkhead connector and the ECM. Inspect the wiring and then repair the wiring. Otherwis