20. Monitor FRP Sensor No Start Test

20. MONITOR FRP SENSOR NO START TEST

Purpose:

NOTICE: This test is only to be carried out if the vehicle has a no start condition, the engine oil level is correct and the fuel injectors are confirmed to not have any fuel injector nozzle leaks. If any of these conditions are present while this test is being carried out, cylinder damage may occur. If the engine runs, do not carry out this test. For a hard start condition, continue to the Power Balance Test to continue diagnosis.

The purpose of this test is to determine if the required fuel pressure to start the vehicle is present and the FRP sensor is reading correctly.

Monitor FRP Sensor No Start Test
- Access and monitor the FRP PID while cranking the engine.
- Disconnect the FRP sensor electrical connector.
- Crank the engine.







Recommended Procedure:
- Connect the scan tool.
- Ignition ON, engine OFF.
- Access and monitor the FRP PID while cranking the engine.
- If the FRP is greater than 20 MPa (2,900 psi), do not continue with this test, GO to Pinpoint Test ME. Test ME: Fuel Pump Control - High Pressure Fuel Injection Pump
- If the FRP is below 20 MPa (2,900 psi), continue with this test.
- Disconnect the FRP sensor electrical connector.
- Crank the engine.
- If the engine starts, the FRP value is equal to or greater than 20 MPa (2,900 psi). Connect the FRP sensor electrical connector and attempt to start the engine. If the engine does not start with the FRP sensor reconnected, install a new FRP sensor and bleed the fuel system. Refer to the Fuel Delivery and Air Induction, Fuel System, Fuel System Bleeding - High Pressure, Diesel Engine
- If the engine does not start, reassemble the engine and bleed the fuel system. Refer to the Fuel Delivery and Air Induction, Fuel System, Fuel System Bleeding High Pressure, Diesel Engine. GO to Pinpoint Test ME. Test ME: Fuel Pump Control - High Pressure Fuel Injection Pump

Tools Required:
Scan tool