DTC Advanced Diagnostics: P2623
DTC P2623:High Pressure Fuel Pump Spill Valve Malfunction

General Description

The powertrain control module (PCM) monitors the high pressure fuel pump for diagnosis of electric circuit. If the PCM detects abnormal in high pressure fuel pump circuit, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
–
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
Minimum
Maximum
Engine speed [Engine Speed]
80 min-1 (rpm)
–
12 volt battery voltage [Battery]
8 V
16 V
[ ]: HDS Parameter

Malfunction Threshold
Either of the conditions occurs:
Open circuit
The voltage difference between high side (HPUMP H) and ground is more than 3.0 V.
The voltage difference between low side (HPUMP L) and ground is less than 1.5 V.

Short circuit in HPUMP H line (Either malfunction threshold A or B)
Malfunction threshold A
?
The voltage difference between power and high side (HPUMP H) is more than 1.5 V.
?
The voltage difference between high side (HPUMP H) and ground is less than 3.0 V.
?
The voltage difference between low side (HPUMP L) and ground is less than 1.5 V.
?
There is no short to ground at low side (HPUMP L) in result of pinpointing.
Malfunction threshold B
?
The voltage difference between power and high side (HPUMP H) is less than 1.5 V.
?
The voltage difference between high side (HPUMP H) and ground is more than 3.0 V.
?
The voltage difference between low side (HPUMP L) and ground is more than 1.5 V.
?
There is no short to power at low side (HPUMP L) in result of pinpointing.

Short circuit in HPUMP L line (Either malfunction threshold A or B)
Malfunction threshold A
?
The voltage difference between power and high side (HPUMP H) is more than 1.5 V.
?
The voltage difference between high side (HPUMP H) and ground is less than 3.0 V.
?
The voltage difference between low side (HPUMP L) and ground is less than 1.5 V.
?
The voltage difference between low side (HPUMP L) and ground is less than 3.5 V during pinpointing.
Malfunction threshold B
?
The voltage difference between power and high side (HPUMP H) is less than 1.5 V.
?
The voltage difference between high side (HPUMP H) and ground is more than 3.0 V.
?
The voltage difference between low side (HPUMP L) and ground is more than 1.5 V.
?
The low side (HPUMP L) current is more than 2.35 A during pinpointing.

HPUMP H line short to HPUMP L line (Either malfunction threshold A or B)
Malfunction threshold A
?
The low side (HPUMP L) current is more than 4.8 - 6.32 A during the beginning of actuation.
Malfunction threshold B
?
Abort of previous actuation due to short circuit.
?
The voltage difference between power and high side (HPUMP H) is more than 1.5 V.
?
The voltage difference between low side (HPUMP L) and ground is more than 1.5 V.
?
The low side (HPUMP L) current is more than 2.35 A during pinpointing.

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 HPUMP H line open
High pressure fuel pump HPUMP H line short to ground
High pressure fuel pump HPUMP H line short to power
High pressure fuel pump HPUMP L line open
High pressure fuel pump HPUMP L line short to ground
High pressure fuel pump HPUMP L line short to power
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, 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.