PLATE AS 2823481 - Caterpillar

Illustration 9 g00676088
Connector for the Breakout T
Connect ET to the cab data link connector.
Turn the ignition key switch to the OFF position.
Disconnect the ECM vehicle harness connector J1/P1.
Remove terminal 41 (output 11) from the vehicle harness connector P1.
Install a breakout T between connectors J1 and P1.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire.
Connect the jumper wire to terminal 5 (ap sensor/switch common) and to terminal 41 (input 11) of the breakout T.Refer to illustration 9.
Turn the ignition key switch to the ON position.
Access the "A/C High Pressure Switch" status screen on ET.
Remove the jumper wire and then insert the jumper wire. At the same time, watch the "A/C High Pressure Switch" status on ET.Expected Result:The status screen indicates that the "A/C High Pressure Switch" status is OFF when the jumper wire is in place. The status screen indicates ON when the jumper wire is removed.Results:
Yes - The ECM is OK.Repair: If a problem still exists, then the problem is in the OEM Wiring. Repair the problem or send the vehicle to the OEM dealer for repair. Verify that the repair eliminates the problem.STOP
No - Repair: Temporarily connect a test ECM. Ensure that the "A/C Pressure Switch Fan On-Time" parameter is programmed in the same manner as the suspect ECM. Use ET to check the ECM. If the problem is resolved with the test ECM, install the suspect ECM. If the problem returns with the suspect ECM, replace the ECM.Verify that the repair eliminates the problem.STOPTest Step 8. Use ET to Check Inlet Manifold Air Temperature and the Coolant Temperature.
Connect ET to the cab data link connector.
Turn the ignition key switch to the ON position.
Access the status screen. Locate the "Coolant Temperature" and the "Inlet Manifold Air Temperature" status screen. Monitor the status screen for a few minutes in order to verify that the temperatures are changing as the engine warms up.Expected Result:The "Coolant Temperature" and the "Inlet Manifold Air Temperature" appear to have the correct reading.Results:
Yes - Proceed to Test Step 9.
No - Repair: Temporarily connect another sensor. Test the new sensor by checking "Inlet Manifold Air Temperature" and "Coolant Temperature" again. If the problem is resolved with the new sensor, then install the old sensor in order to verify that the problem returns. If the problem returns, then replace the old sensor.Verify that the repair eliminates the problem.STOPTest Step 9. Use the "Cooling Fan Solenoid Special Test" on ET to Check the Circuit.
Illustration 10 g00676097
Connector for the Breakout T
Connect ET to the cab data link connector.
Turn the ignition key switch to the ON position.
Access the "Cooling Fan Special Test". Access each menu in the order that follows:
Diagnostics
Diagnostic Tests
Special Test If any override switches are installed, the switch must be in the OFF position.
Cycle the "Special Test" to the ON position and to the OFF position. Listen for the solenoid to click. You may need to be near the engine in order to hear the click of the solenoid.Expected