Mitsubishi Galant (2004+). Manual - part 1260

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-733

Step 17   .

STEP 17. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern (Refer to 

Diagnostic Function 

− OBD-ll Drive Cycle − Procedure 1 − 

Evaporative Emission System Leak Monitor 

P.13B-5

).

(2) Read the diagnostic trouble code (DTC).
Q: Is DTC P0452 set?

YES : Repeat the troubleshooting from Step 2.
NO :  The procedure is complete.

DTC P0453: Evaporative Emission System Pressure Sensor High Input

AC306278

A

B

C

D

E

F

G

O

P

Q

N

M

L

H

I

J

K

AC

INTAKE MANIFOLD PLENUM

FUEL TANK

EVAPORATIVE EMISSION
VENTILATION SOLENOID

CHECK VALVE

EVAPORATIVE EMISSION
PURGE SOLENOID

EVAPORATIVE 
EMISSION CANISTER

ONBOARD REFUELING
VAPOR RECOVERY(ORVR)
VENT VALVE MODULE

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

SYSTEM DIAGRAM

CHAMBER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-734

FUEL TANK 
DIFFERENTIAL 
PRESSURE 
SENSOR

POWERTRAIN 
CONTROL 
MODULE

Fuel Tank Differential Pressure Sensor Circuit

AC306128

AC306248

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

B-20

CONNECTOR: B-20

PCM

AIR
CLEANER

AC305231

CONNECTOR: C-25

AM

C-25

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-735

.

CIRCUIT OPERATION

• The PCM (terminal 21) supplies a 5-volt refer-

ence voltage to the fuel tank differential pressure 
sensor (terminal 3). The PCM (terminal 22) sup-
plies a ground to the fuel tank differential pres-
sure sensor (terminal 2).

• The PCM (terminal 23) receives a voltage signal 

proportional to the pressure in the fuel tank from 
the fuel tank differential pressure sensor (terminal 
1).

.

TECHNICAL DESCRIPTION

• To determine whether the fuel tank differential 

pressure sensor is defective, the PCM monitors 
the fuel tank differential pressure sensor output 
voltage.

• The PCM judges if the fuel tank differential pres-

sure sensor output voltage is normal.

NOTE: In rare cases, this DTC may be also set 
under some fuel and driving conditions regardless of 
the fuel pressure sensor output voltage when the fuel 
system is clogged.

.

DESCRIPTIONS OF MONITOR METHODS

• Compare purge solenoid status with fuel tank dif-

ferential pressure sensor output voltage.

.

MONITOR EXECUTION

• Continuous.

.

MONITOR EXECUTION CONDITIONS (Other 
Monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Evaporative emission purge solenoid monitor

• Evaporative emission ventilation solenoid monitor

 Sensor (The sensors below are determined to be 

normal)

• Mass airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

.

AC305266

CONNECTOR: D-23

AB

D-23 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-736

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Test Conditions: For Test to Run

• Intake air temperature is between 5°C (41°F) and 

45

°C (113°F) or greater.

• Engine speed is 1,600 r/min or greater.

• Volumetric efficiency is between 20 to 70 percent.

Judgment Criteria

• When the evaporative emission purge solenoid 

valve is fully operational (100 percent ratio), the 
fuel differential pressure sensor output voltage 
remains at 4.0 volts or greater for ten seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 1 

− Evaporative Emission System Leak 

Monitor 

P.13B-5

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of the fuel tank differential pressure 

sensor.

• Open or shorted fuel tank differential pressure 

sensor circuit.

• Malfunction of the PCM.

.

NO

YES 

CONTINUOUS

FAILURE FOR 10 SECS

START

 

END

 

NO 

NO

NO

YES

 

YES 

 

YES   

MALFUNCTION

GOOD

 

MONITORING

 

CONDITIONS

 

OUTPUT VOLTAGE

 

< 1.0V

OUTPUT VOLTAGE

 

> 4.0V

 

AC306648

RANGE CHECK - MIN/MAX