ROD AS 3240391 - Caterpillar

to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect all of the following pressure sensors at the sensor connector:
Fuel pressure sensor
Engine oil pressure sensor
Boost pressure sensor
Atmospheric pressure sensor
Turn the keyswitch to the ON position.Note: The original diagnostic code may go away. An open circuit diagnostic code for the sensor supply may become active when all of the sensors are disconnected. Ignore the active codes at this time and continue with this test step.
Measure the voltage between terminal A (5 V supply) and terminal B (sensor return) at the sensor connectors.
Turn the keyswitch to the OFF position.
Reconnect all sensors.Expected Result:The voltage is 5.0 0.2 VDC.Results:
OK - The voltage is 5.0 0.2 VDC. The voltage is correct. Proceed to Test Step 3.
Not OK - The voltage is not 5.0 0.2 VDC.Repair: The voltage is incorrect. Perform the diagnostic functional test Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test".STOPTest Step 3. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.
Determine if the problem is related to a 03 diagnostic code or a 04 diagnostic code.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A 04