DTC Advanced Diagnostics: P0088 (3.0L Engine)

DTC P0088: Fuel Rail Pressure Too High

General Description

Courtesy of HONDA, U.S.A., INC.

The powertrain control module (PCM) controls fuel pressure delivered by the high pressure fuel pump. The measured fuel pressure is compared with the target fuel pressure. If the difference between the measured fuel pressure and the target fuel pressure is large, the PCM detects a malfunction.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	20 seconds or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
Target fuel pressure fluctuation amount per 50 milliseconds*	-	-2.5 MPa (-25.493 kgf/cm 2, -362.6 psi)
Other	Continue fuel feedback control for 15 seconds or more
Other	Not during fuel cut-off for 3 seconds or more

*: Continue for 3 seconds or more.

Malfunction Threshold

Measured fuel pressure - (minus) target fuel pressure is more than 6.3 MPa (64.242 kgf/cm 2, 913.76 psi) for at least 20 seconds.

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

High pressure fuel pump failure (high delivery)
High fuel pressure pipe failure (clogged, deformed)
Injector failure (keeps injecting)
Fuel rail pressure sensor failure

Confirmation Procedure

Operating Condition

Start the engine.
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.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.