Mitsubishi Outlander GS45X. Manual - part 896

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-517

.

CIRCUIT OPERATION

• The ECM (terminal No. 114) supplies a 5-volt ref-

erence signal to the fuel tank differential pressure 
sensor (terminal No. 3). The fuel tank differential 
pressure sensor (terminal No. 2) is grounded 
through the ECM (terminal No. 113).

• The fuel tank differential pressure sensor (termi-

nal No. 1) returns a voltage signal to the ECM 
(terminal No. 112) that is proportional to the pres-
sure in the fuel tank.

.

TECHNICAL DESCRIPTION

• The ECM monitors the fuel tank differential pres-

sure sensor output voltage.

• The ECM determines whether the fuel tank differ-

ential pressure sensor signal voltage is within 
normal operating parameters.

.

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

• Fuel temperature sensor monitor

• Fuel level sensor monitor

 Sensor (The sensors below are determined to be 

normal)

• Mass airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

• Accelerator pedal position sensor

.

AK704189

Fuel tank differential
pressure sensor

D-19

Connector: D-19

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-518

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgement Criteria

• The fuel tank differential pressure sensor output 

voltage remains 0.2 volt or less for 5 seconds.

.

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Pattern 22 

P.13B-11

.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CODE TO BE 
SET ARE:)

• Connector damage.

• Harness damage.

• Fuel tank differential pressure sensor failed.

• ECM failed.

.

OVERVIEW OF TROUBLESHOOTING

•  DTC P0452 can be set by a faulty fuel tank differ-

ential pressure sensor or related circuit, or ECM 
failure.

AK704187

No

End

No 

No

Malfunction

Good

No

Start

Monitoring
conditions

Output voltage

< 0.2v

Output voltage

> 4.8v

Yes

Yes

Yes

Yes

Continuous

failure for 5 secs

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-519

• To check for system blockage, do a performance 

test which uses a mechanical vacuum gauge and 
scan tool MB991958 set on the fuel tank differen-
tial pressure sensor (52: Fuel tank differential 
PRS. SNSR). The mechanical gauge reading is 
used to verify scan tool MB991958 reading. A 
comparison of the mechanical gauge with the 
reading on scan tool MB991958 will locate a 
problem in the system.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

• MB992110: Power Plant ECU Check Harness

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-520

STEP 1. Using scan tool MB991958, check data list item 52: 
Fuel Tank Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hose C from the evaporative emission canister, 

and plug the hose.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.

• Item 52, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressure reading on the scan tool 

should be 1,500 to 3,500 mV.

(6) Connect the evaporative emission system pressure pump 

(Miller number 6872A) to the fuel tank filler tube by using 
fuel tank adapter (MLR-8382) and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

(7) Turn the ignition switch to the "LOCK" (OFF) position. Then 

disconnect scan tool MB991958.

(8) Remove the evaporative emission system pressure pump 

(Miller number 6872A) and the fuel tank adapter 
(MLR-8382), and reinstall the fuel cap.

(9) Connect hose C to the evaporative emission canister.
Q: Is the fuel tank pressure between 1,500 and 3,500 mV?

YES : It can be assumed that this malfunction is intermittent 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

). 

NO :  Go to Step 2 .

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

AK704159

Hose C

Plug

AB

AK704160