Mitsubishi Montero (2004+). Manual - part 277

 

  Index      Mitsubishi     Mitsubishi Montero - service repair manual 2004 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  275  276  277  278   ..

 

 

Mitsubishi Montero (2004+). Manual - part 277

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-595

.

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.13A-4

.

.

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.

.

OVERVIEW OF TROUBLESHOOTING

• DTC P0453 can be set by a faulty fuel tank differ-

ential pressure sensor or related circuit, or PCM 
failure.

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 

AC210306

RANGE CHECK - MIN/MAX

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-596

• 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 (TANK PRS SNSR 73). The 
mechanical gauge reading is used to verify scan 
tool 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 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

• MB991658: Test Harness Set

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-597

STEP 1. Using scan tool MB991958, check data list item 73: 
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 F from the evaporative emission canister 

side, 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 73, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressures reading on the scan tool 

should be 

−1.5 to 1.5 kPa (−0.443 to 0.443 inHg).

(6) Connect an evaporative emission system pressure pump to 

the fuel tank filler tube and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

(7) Disconnect an evaporative emission system pressure pump 

and connect hose F.

(8) Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect scan tool MB991958.

Q: Is the fuel tank pressure between 

1.5 and 1.5 kPa 

(

0.443 and 0.443 inHg)?

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 Malfunction 

P.00-6

). Go to 

Step 15.

NO :  Go to Step 2.

AC306409AF

MB991911

MB991824

MB991827

AC102602 AC

HOSE F

ACX01358

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-598

STEP 2. Measure the signal voltage at fuel tank differential 
pressure sensor connector G-05.
(1) Tumble the second seat.
(2) Remove the service hole cover (upper) and packing.
(3) Remove the service hole cover (lower) and packing.
(4) Disconnect fuel tank differential pressure sensor connector 

G-05.

(5) Connect special tool MB991658 between fuel tank 

differential pressure sensor connector G-05 terminals 1, 2 
and 3.

(6) Turn the ignition switch to the "ON" position.
(7) Remove the fuel cap.
(8) Measure the voltage between fuel tank differential pressure 

sensor connector G-05 terminal 1 and ground.

• The voltage should measure between 2.0 and 3.0 volts.

(9) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 2.0 and 3.0 volts?

YES : Go to Step 10.
NO :  Go to Step 3.

STEP 3. Measure the 5-volt reference signal at fuel tank 
differential pressure sensor connector G-05.
(1) Disconnect fuel tank differential pressure sensor connector 

G-05.

(2) Connect special tool MB991658 between fuel tank 

differential pressure sensor connector G-05 terminals 1, 2 
and 3.

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between fuel tank differential pressure 

sensor connector G-05 terminal 3 and ground.

• The voltage should measure between 4.9 and 5.1 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?

YES : Go to Step 8.
NO :  Go to Step 4.

ACX00218

CONNECTOR : G-05

AS

G-05 (B)

SERVICE HOLE (UPPER)

G-05 HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

3

SERVICE HOLE (LOWER)

AC002081AB

MB991658

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

ACX00218

CONNECTOR : G-05

AR

G-05 (B)

SECOND SEAT UNDER
SERVICE HOLE

G-05 HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

3

AC002081AB

MB991658

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

 

 

 

 

 

 

 

Content   ..  275  276  277  278   ..