DTC Advanced Diagnostics: P2623 (3.0L Engine)

DTC P2623: High Pressure Fuel Pump Spill Valve Malfunction

General Description

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

The high pressure fuel pump adjusts the pressure of the fuel rail internal combustion and is controlled by the powertrain control module (PCM) ON/OFF command. The injector driver IC controls the high pressure fuel pump driver circuit according to the drive commands output from the microcomputer (MCU) and drives the high pressure fuel pump. The injector driver IC monitors injector currents and terminal voltage of the PCM and transmits results to the MCU. If the monitored conditions are abnormal for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	0.5 second or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [Battery]	10.0 V	-
State of the engine	Running

[ ]: HDS Parameter

Malfunction Threshold

Either of the condition occurs for at least 0.5 second during engine stall, or at least 2, 400 revolutions during engine running:

The high pressure fuel pump current does not flow or it is over flowing while the power is fed.
The high pressure fuel pump line voltage is short to ground voltage or short to power voltage while the power is not fed.

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 HPUMPH line open
High pressure fuel pump HPUMPH line short to ground
High pressure fuel pump HPUMPH line short to power
High pressure fuel pump HPUMPL line open
High pressure fuel pump HPUMPL line short to ground
High pressure fuel pump HPUMPL line short to power
Injector relay stuck off
High pressure fuel pump failure
PCM internal circuit failure

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.