0321897 JOHNSON GASKET

Illustration 1 g00932484
Circuit schematic for torque limit switch
The return may be connected to P1-3, to P1-5, or to P1-18.
Illustration 2 g01152506
Pin locations on ECM connector
(P1-5) AP sensor/switch sensor common
(P1-7) Input 4
(P1-23) Input 19 Test Step 1. Inspect Electrical Connectors and 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 that are associated with the torque limit switch.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and pinch points from the battery to the ECM. Then, check the wiring from the ignition key switch 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:
Yes - The wiring is OK. Proceed to Test Step 2.
Not OK - The wiring is not OK.Repair: 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. Check the Status of the Torque Limit Switch on Caterpillar Electronic Technician (ET)
Establish communication between Cat ET and the ECM. Note: If the "Torque Limit Switch" status indicates "Not Installed", then the "Torque Limit Switch" parameter has not been programmed.
View the "Torque Limit Switch" status on Cat ET.
Set the torque limit switch to the ON position and to the OFF position. 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 indications are correct. The switch is operating normally. Continue troubleshooting if the original condition is not resolved.STOP
Not OK - An indication is not correct. The ECM is not reading the input from the switch. Proceed to Test Step 3.Test Step 3. Check the Switch Circuit for the ECM
Illustration 3 g01152509
Pin locations on the breakout T
(5) AP sensor/switch sensor common
(7) Input 4
Turn the ignition key switch to the OFF/RESET position.
Install a breakout T to the ECM vehicle harness connector J1/P1.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire.
Insert the jumper wire into terminal 7 of the breakout T. Connect the other end of the jumper wire to terminal 5 in the breakout T. Terminal 5 is AP Sensor/Switch Common.
Turn the ignition key switch to the ON position.
Alternately remove the jumper wire and then insert the jumper wire from terminal 5. At the same time, monitor the status screen on Cat ET. Expected Result:The switch status is "ON" when the jumper wire is installed. The switch status is "OFF" when the jumper wire is removed.Results:
Yes - The indications are correct. The ECM is working correctly. Restore the wiring to the original configuration. Proceed to Test Step 4.
Not OK - The ECM is not working correctly.Repair: Perform the following repair:
Restore the wiring to the original configuration.
Temporarily connect a test ECM.
Check the system for proper operation.
If the problem is resolved with the test ECM, connect the original ECM.
If the problem returns with the original ECM, replace the ECM.
Verify that the repair eliminates the problem. STOPTest Step 4. Insert a Jumper Wire at the Switch
Turn the ignition key switch to the OFF/RESET position.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire.
Insert the jumper wire between the two switch terminals of the torque limit switch.
Turn the ignition key switch 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 is to "ON" when the jumper wire is installed. The switch status is "OFF" when the jumper wire is removed.Results:
Yes - The indications are correct.Repair: Replace the torque limit switch. Verify that the repair eliminates the problem.STOP
Not OK - An indication is incorrect. There is a problem in the wire harness between the torque limit switch and the ECM. Proceed to Test Step 5.Test Step 5. Insert a Jumper Wire at the Bulkhead Connector
Turn the ignition key switch to the OFF/RESET position.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire.
Locate the socket for the torque limit switch in the engine side of the bulkhead connector.
Insert the wire jumper pin between the switch socket and the sensor common connection. Install the jumper wire on the engine side of the bulkhead connector.
Turn the ignition key switch 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 is "ON" when the jumper wire is installed. The switch status is "OFF" when the jumper wire is removed.Results:
OK - The indications are correct. The problem is in the vehicle wiring between the bulkhead connector and the switch. Repair the vehicle wiring. Otherwise, send the vehicle to an OEM dealer for repair.STOP
Not OK - The problem is in the vehicle wiring between the bulkhead connector and the ECM. Repair the vehicle wiring. Otherwise, send the vehicle to an OEM dealer for repair.STOP