3Y9-10302-0 Tohatsu PLATE, FUEL INJECTOR

Note: This diagnostic code represents an event. This diagnostic code does not represent an electronic system fault.The Engine Control Module (ECM) detects the following conditions:
The engine oil pressure sensor indicates that the engine oil pressure is below the trip line in Illustration 1.
The diagnostic codes for the oil pressure circuit are not active.
Illustration 1 g00998002
Low oil pressure
System Response:The Caterpillar Electronic Technician (ET) will display "LOW OIL PRESSURE" and "DIAG" next to the status for "Engine Oil Pressure". The check engine lamp and the warning lamp will illuminate.Customer passwords are required to clear this diagnostic code.Possible Performance Effect:NoneTroubleshooting:This diagnostic code indicates low oil pressure. This diagnostic code does not indicate a problem with the ECM or the oil pressure sensor. Check the engine oil level. Refer to the graphs for oil pressure that are shown in Troubleshooting, "System Overview".Test Step 1. Check the Engine Oil Level
Check the engine oil level. Expected Result:The engine oil level is OK.Results:
OK - The engine oil level is OK. Proceed to Test Step 2.
Not OK - The engine oil level is low.Repair: Add engine oil to the proper level. Refer to the Operation and Maintenance Manual for more information.STOPTest Step 2. Verify Proper Sensor Installation
Check the installation of the engine oil pressure sensor.
Check the wiring of the engine oil pressure sensor. Refer to the Electrical Schematic for the proper wiring. Ensure that all of the wires and connectors are properly connected. Expected Result:The sensor is properly installed and the wiring is correct.Results:
OK - The sensor is properly installed. Proceed to Test Step 3.
Not OK - The sensor is not installed properly.Repair: Install the engine oil pressure sensor properly. Repair the wiring and/or the connectors to the sensor.Verify that the repair eliminates the problem.STOPTest Step 3. Check for Active Diagnostic Codes
Connect Cat ET to the data link connector.
Check for active diagnostic codes that are related to the barometric pressure sensor (atmospheric pressure) or the boost pressure sensor. Expected Result:There are no diagnostic codes that are related to the barometric pressure sensor (atmospheric pressure) or the boost pressure sensor.Results:
OK - There are no diagnostic codes. Proceed to Test Step 4.
Not OK - There is a diagnostic code that is related to the barometric pressure sensor (atmospheric pressure) and/or the boost pressure sensor.Repair: Troubleshoot the diagnostic code before continuing with this procedure.STOPTest Step 4. Check the Status Screen
Turn the ignition key switch to the ON position. The engine should be off.
Monitor the status for "Boost Pressure" and "Engine Oil Pressure" on Cat ET. Expected Result:"Boost Pressure" and "Engine Oil Pressure" should be less than 10 kPa (2 psi).Results:
OK - The boost pressure and the engine oil pressure are less than 10 kPa (2 psi). Proceed to Test Step 6.
Not OK - Boost Pressure - The boost pressure is greater than 10 kPa (2 psi). Proceed to Test Step 5.
Not OK - Engine Oil Pressure - The engine oil pressure is greater than 10 kPa (2 psi). Proceed to Test Step 5.
Not OK - Both - The boost pressure and the engine oil pressure are greater than 10 kPa (2 psi). Proceed to Test Step 5.Test Step 5. Check the Supply Voltage to the Suspect Pressure Sensor(s)
Turn the ignition key switch to the OFF/RESET position.
Disconnect the barometric pressure sensor (atmospheric pressure), the boost pressure sensor, and the engine oil pressure sensor.
Turn the ignition key switch to the ON position.
Measure the voltage between terminal A (Engine Pressure Sensor +5V) and terminal B (Engine Pressure Sensor Common) of each suspect pressure sensor connector on the engine harness. Expected Result:The voltage is 5.0 0.16 VDC.Results:
OK - The voltage is within the range.Repair: Reconnect the engine oil pressure sensor and the boost pressure sensor.Temporarily connect a new barometric pressure sensor (atmospheric pressure).If the new sensor fixes the problem, reconnect the suspect sensor.If the problem returns, permanently replace the sensor.Verify that the repair eliminates the problem.If the problem is not eliminated perform this repair procedure on the engine oil pressure sensor and the boost pressure sensor.Verify that the repair eliminates the problem.STOP
Not OK - There is a problem with the 5 volt supply.Repair: Check the J2/P2 ECM connector and the sensor connectors for corrosion and moisture.Check the 5 volt supply wire. Verify that the wire is not cut and that the wire is completely inserted into the connectors for the pressure sensors on the engine harness.Verify that the repair eliminates the problem.STOPTest Step 6. Install a Pressure Gauge
Remove the engine oil pressure sensor.
Install a 1U-5470 Engine Pressure Group into the oil gallery with a Tee fitting in the port for the engine oil pressure sensor.
Connect the engine oil pressure sensor to the Tee fitting.
Turn the ignition key switch to the ON position.
Monitor the status for "Engine Oil Pressure" on Cat ET.
Start the engine and run the engine at low idle.
Compare the pressure reading on the gauge to the pressure reading on Cat ET.
Monitor the status screen and the gauge while you increase the engine speed. Expected Result:The gauge and the status screen are within 35 kPa (5.0 psi) of each other.Results:
OK - The sensor is functioning properly.Repair: Compare the readings from the pressure gauge to the oil pressure maps in Illustration 1. There is a mechanical problem if the engine oil pressure is lower than the trip line on the oil pressure map.Refer to Testing and Adjusting, "Engine Oil Pressure - Test".STOP
Not OK - The sensor is not functioning properly.Repair: Temporarily install a new engine oil pressure sensor.If the new sensor repairs the problem, reinstall the suspect sensor.If the problem returns, replace the sensor.Verify that the repair eliminates the problem.STOP