DTC Advanced Diagnostics: P0087

DTC P0087:Fuel Rail Pressure Too Low

General Description

The powertrain control module (PCM) controls fuel pressure delivered by the high pressure fuel pump. If the actual fuel pressure deviates from the target fuel pressure for a set time, the PCM detects a malfunction. The DTC is also stored when the fuel pressure relief valve is opened to protect the fuel line when the fuel reaches an abnormally high pressure.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

Execution	Once per driving cycle
Sequence	None
Duration	4.0 seconds or more
DTC Type	One drive cycle, MIL on
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions

Condition	Minimum	Maximum
Elapsed time after returning from fuel cut	3.0 seconds	–
No active DTCs set (prevents monitor from running)	P0192, P0193, P0201, P0202, P0203, P0204, P0335, P0339, P2623

Malfunction Threshold

Either of these conditions is met for at least 4.0 seconds:

	The actual fuel pressure is 0.8 MPa (8.1 kgf/cm², 116 psi) or less when target fuel pressure is 2.5 MPa (25.5 kgf/cm², 363 psi).
	The actual fuel pressure is 11.5 MPa (117.2 kgf/cm², 1,667 psi) or less when target fuel pressure is 15 MPa (153 kgf/cm², 2,175 psi).

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes

	Fuel pump low flow
	Low pressure fuel line clogged
	Fuel filter clogged
	Fuel injector stuck open
	High pressure fuel pump failure (spill valve stuck)
	Fuel rail pressure sensor range/performance problem

Confirmation Procedure

Operating Condition

1.	Start the engine.
2.	Drive the vehicle repeated acceleration and deceleration.

	When freeze data is stored, drive the vehicle under those conditions instead of Driving Pattern step 2.
	Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

With the HDS

Do the DI FUEL PRESSURE TEST in the INSPECTION MENU with the HDS.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.