P0087

P0087-FUEL RAIL PRESSURE TOO LOW




For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams. Electrical Diagrams
Theory of Operation

The Engine Control Module (ECM) will turn on the MIL lamp immediately after this diagnostic runs and fails. This DTC will cause active regeneration to be disabled. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:
Engine running.

- Set Condition:
Actual fuel pressure differs from set point more than a calibrated amount for a calibratable amount of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. EXTERNAL FUEL LEAKS

NOTE: If P000F DTC is present, perform the diagnostics for P000F before continuing with this test. P000F

1. Put on personal protective equipment.
2. Operate engine at idle when looking for fuel leaks.
3. Use the scan tool to operate engine at a variety of engine speeds.

Any external fuel leaks detected?

Yes

- Repair or replace component with external fuel leak.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. CHECKING THE FUEL DELIVERY SYSTEM
1. Using the scan tool, monitor the fuel pressure reading from the Fuel Pressure Sensor at idle and at 2000 RPM.

Is the fuel rail pressure reading higher at 2000 RPM than at idle?

Yes

- Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Checking the Fuel Delivery System

No

- Replace the Fuel Pressure Sensor.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.