DTC Advanced Diagnostics: P0627 (3.0L Engine)

DTC P0627: Fuel Pump Control (FPC) System Malfunction

General Description

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

The fuel pump driver unit controls the fuel pump output based on the (pulse width modulation) PWM control signal duty from the powertrain control module (PCM), and provides optimal amount of fuel to the high pressure fuel pump from the fuel tank. The PCM monitors the voltage level and over current of the fule pump driver unit control terminal by the output driver circuit. If abnormal voltage level or over current is detected, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	1.5 seconds or more
DTC Type	One drive cycle, MIL off

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [Battery]	10.0 V	-
Fuel pump duty*	1.2 %	-
Fuel pump duty**	-	98.8 %
Fuel pump duty***	15.0 %	65.0 %
Fuel pump relay request	On
Vehicle	ON mode

*: FPC terminal voltage low diagnosis**: FPC terminal voltage high diagnosis***: Fuel pump driver unit failure diagnosis[ ]: HDS Parameter

Malfunction Threshold

Any of the condition occurs:

FPC terminal voltage low diagnosis
The voltage level of the FPC terminal is ON (low voltage) for at least 1.5 seconds despite the PCM outputs OFF to the fuel pump driver unit.
FPC terminal voltage high diagnosis
The voltage level of the FPC terminal is OFF (high voltage) for at least 1.5 seconds despite the PCM outputs ON to the fuel pump driver unit.
Fuel pump driver unit failure diagnosis
The PCM receives malfunction information from the fuel pump driver unit at least 3 times while the PCM outputs ON to the fuel pump driver unit.

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 driver unit FPC line short to power
Fuel pump driver unit FPC line short to ground
Fuel pump control module FPC line open
Fuel pump driver unit power supply line failure
Fuel pump driver unit failure
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.