SCRAPER 2474428 - Caterpillar

Illustration 3 g01331612
Terminals for the pressure sensor connector
(A) +5V supply
(B) Sensor common
(C) Signal
Turn the keyswitch to the OFF position.
Disconnect the sensor from the engine harness.
Connect a 3-Terminal Breakout T to the engine harness only. Do not connect the sensor to the Breakout T.
Turn the keyswitch to the ON position.
Measure the voltage between terminal "A" (+5V supply) and terminal "B" (sensor common). Expected Result:The DC voltage between terminal "A" and terminal "B" measures 4.5 to 5.5 Volts DC.Results:
OK - The sensor supply voltage is correct. Remove the Breakout T. Proceed to Test Step 8.
Not OK - The sensor supply voltage is out of the nominal range. Continue testing the sensor supply circuit.Repair: Proceed to the following repair: Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test"STOPTest Step 7. Determine If The Short Circuit Is In The Connector Or In The Sensor
Thoroughly inspect the connector for moisture.
Inspect the seals and reconnect the sensor.
Refer to Troubleshooting, "Electrical Connectors - Inspect".
If the "voltage below normal" diagnostic code reappears, the sensor or the sensor connector has a fault.
Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine.
Use the electronic service tool to verify that there is a "voltage below normal" diagnostic code. The new sensor should be connected to the harness at this time. Expected Result:The "voltage below normal" diagnostic code is not present when a new sensor is connected.Results:
OK - Verify that the repair eliminates the fault. Use the electronic service tool to clear the logged diagnostic codes.STOP
Not OK - Repair the engine harness connector. Use the electronic service tool to clear the logged diagnostic codes.STOPTest Step 8. Create a Short Circuit Between the Signal and the Common Terminals at the Engine Harness Connector
Illustration 4 g01331612
Terminals for the pressure sensor connector
(A) +5V supply
(B) Sensor common
(C) Signal
Turn the keyswitch to the ON position.
Fabricate a jumper wire 150 mm (6 inch) long. Crimp a Deutsch terminal to both ends of the wire.
Monitor the "Active Diagnostic Code" screen of the electronic service tool before installing the jumper wire and after installing the jumper wire.
Install the jumper on the engine harness connector. Install one end of the jumper at the sensor signal (terminal "C"). Install the other end of the jumper at the common connection for the pressure sensor (terminal "B"). Wait at least 15 seconds for activation of the "voltage below normal" diagnostic code. Refer to Illustration 4.Expected Result:A "voltage below normal" diagnostic code is active when the jumper is installed. An "voltage above normal" diagnostic code is active when the jumper is removed.Results:
OK - The engine harness and the ECM are OK.Repair: Perform the following repair:
Temporarily connect the suspect sensor.
Use the electronic service tool to verify if the diagnostic code remains active.
If the diagnostic code is active, install a new sensor.
Use the electronic service tool to verify that the repair eliminated the fault. STOP
Not OK - The "voltage above normal" diagnostic code remains active when the jumper is installed. The most probable location for the open circuit