Component Location
General Description

The Low Pressure Pump (LPP) supplies 65 psi(4.5 bar) of fuel pressure to the High Pressure Pump (HPP).

Using the internally located Fuel Pressure Regulator Valve (FPR), the HPP will boost the fuel pressure from 580 psi(40 bar) at idle to a maximum of 1958 psi(135 bar).

The Fuel Pressure Sensor (FPS) confirms the fuel pressure and returns the signal to the Powertrain Control Module (PCM).

Fuel pressure during limp-home mode is 65 psi(4.5 bar).

DTC Description

P0087 is set when the fuel pressure drops to 0 psi(0 bar) or below.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Plausibility Check

1.

Overflow of fuel return

2.

Circuit short to ground

Enable Conditions

•

Engine Speed: 512-7008 RPM

Threshold Value

•

Fuel Pressure: Less than 0 psi(0 bar)

Diagnostic Time

•

5 Seconds

Mil On Condition

•

2 Drive Cycles

Specification

RPM

IDLE

1,500

6,300

Fault

Fuel Pressure(psi)

580

1305~1450

1958

65

Fuel pressure(bar)

40

90~100

135

4.5

Diagnostic Circuit Diagram
Signal Waveform & Data
•

Fuel pressure rises with rapid increase in RPM.

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