ELBOW 5446148 - Caterpillar

from the sensors back 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 - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the wiring and/or the connectors.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 problem is resolved.If applicable, use Caterpillar Electronic Technician (ET) to perform a wiggle test.STOPTest Step 2. Check the Voltage on the +5 V Supply Wire
Turn the keyswitch to the OFF position.
Disconnect the harness connectors for the pressure sensors.
Turn the keyswitch to the ON position.
Measure the voltage between terminals 1 (+5 VDC) and 2 (Return) at each sensor connector on the engine harness.
Turn the keyswitch to the OFF position.
Connect all of the sensors.Expected Result:Each voltage measurement is 5.0 0.2 VDC.Results:
OK - Each voltage measurement is 5.0 0.2 VDC. Proceed to Test Step 3.
Not OK - At least one voltage measurement is not 5.0 0.2 VDC.Repair: Refer to the circuit test Troubleshooting, "Sensor Supply - Test".STOPTest Step 3. Check for Diagnostic Codes
Connect Cat ET to the service tool connector. Refer to the introduction Troubleshooting, "Electronic Service Tools".
Turn the keyswitch to the ON position.
Check for active and/or for logged diagnostic codes on Cat ET. Wait at least 30 seconds so that any codes may become active. Look for an active diagnostic code for an engine pressure sensor.
Determine if the problem is related to a -3 diagnostic code or a -4 diagnostic code.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active for the engine pressure sensors.Repair: If any of the above codes are logged and the engine is not running properly, refer to troubleshooting without a diagnostic code Troubleshooting.If the engine is running properly at this time, there may be an intermittent problem in a harness that is causing the codes to be logged. Refer to service Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - An -4 diagnostic code is active. Proceed to Test Step 4.
Not OK - An -3 diagnostic code is active. Proceed to Test Step 5.Test Step 4. Disconnect the Suspect Sensor in Order to Create an Open Circuit
Turn the keyswitch to the OFF position.
Disconnect the sensor connector of the sensor with the -4 diagnostic code.
Turn the keyswitch to the ON position. Wait at least 30 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen on Cat ET. Check for an active -3 diagnostic code for the disconnected sensor.
Turn the keyswitch to the OFF position.Expected Result:A -3 diagnostic code is now active for the disconnected sensor.Results:
OK - A -4 diagnostic code was active before you disconnected the sensor. A -3 diagnostic code became active after the sensor was disconnected. The harness and the ECM are OK. There may be a problem with the