Mitsubishi Outlander GS45X. Manual — part 653

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-435

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CIRCUIT OPERATION

• The ECM (terminal No. 114) supplies a 5 volts

reference signal to the fuel tank differential pres-
sure sensor (terminal No. 3). The fuel tank differ-
ential 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.

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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.

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DESCRIPTIONS OF MONITOR METHODS

• Compare evaporative purge solenoid status with

fuel tank differential pressure sensor output volt-
age.

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MONITOR EXECUTION

• Continuous.

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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

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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DTC SET CONDITIONS

Logic Flow Chart (Monitor Sequence)

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Check Conditions

• Intake air temperature is higher than 5°C (41°F).

• Engine speed is 1,594 r/min or higher.

• Volumetric efficiency is between 20 and 70 per-

cent.

Judgement Criterion

• When the evaporative emission purge solenoid is

off, the fuel differential pressure sensor output
voltage remains 1.0 volt or less for 10 seconds.

Check Conditions

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

45

°C (113°F).

• Engine speed is 1,594 r/min or higher.

• Volumetric efficiency is between 20 and 70 per-

cent.

Judgement Criterion

• When the evaporative emission purge solenoid

valve is fully operational (100 percent ratio), the
fuel differential pressure sensor output voltage
remains 4.0 volts or more for 10 seconds.

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OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Pattern 5

P.13A-11

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

• Fuel tank differential pressure sensor failed.

AK604517

No

Yes

Continuous

failure for 10 secs

Start

End

No

No

No

Yes

Yes

Malfunction

Good

Monitoring

conditions

Output voltage

< 1.0V

Output voltage

> 4.0V

Yes

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-437

• Fuel tank differential pressure sensor circuit har-

ness damage, or connector damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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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) Plug the disconnected end of hose D.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode for item

52, Fuel Tank Differential Pressure Sensor.

• Output voltage should be between 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 D to the evaporative emission canister.
Q: Is the sensor operating properly?

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

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NO : Go to Step 2 .

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

AK704159

Hose D

Plug

AC

AK704160