Mitsubishi Outlander GS45X. Manual — part 609

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-259

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 40) from the output terminal (terminal
No. 3) of the heated oxygen sensor (rear).

• Terminal No. 4 of the heated oxygen sensor

(rear) is grounded with ECM (terminal No. 41).

• The ECM applies an offset voltage of 0.5 volt to

terminal No. 4 of the heated oxygen sensor
(rear).

.

TECHNICAL DESCRIPTION

• The output signal of the linear air-fuel ratio sensor

is compensated by the output signal of the
heated oxygen sensor (rear).

• The ECM checks for the heated oxygen sensor

(rear) output voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Heated oxygen sensor (rear) output voltage does not

change during specified go/stop operations
including fuel cut are repeated.

.

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)

• Linear air-fuel ratio sensor monitor

• Linear air-fuel ratio sensor heater monitor

• Heated oxygen sensor (rear) heater monitor

• Heated oxygen sensor offset voltage monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

.

AK900665

D-37 (B)

Rear heater duct (RH)

Heated oxygen
sensor (rear)

AB

Connector: D-37

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-260

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 76°C

(169

°F).

• The linear air-fuel ratio sensor is active.

• The cumulative mass airflow sensor output is

higher than 1,741 g.

• Repeat 1 time or more: drive

*1

, stop

*2

.

Drive

*1

:

• Engine speed is higher than 1,500 r/min.

• Volumetric efficiency is higher than 40 per-

cent.

• Vehicle speed is higher than 30 km/h (19

mph).

• A total of more than 60 seconds have

elapsed with the above mentioned condi-
tions, and more than 3 seconds have
elapsed with the fuel shut off.

Stop

*2

:

• Vehicle speed is lower than 1.5 km/h (1

mph).

Judgement Criterion

• Change in the output voltage of the heated oxy-

gen sensor (rear) is lower than 0.313 volt.

or

• The maximum output voltage of the heated oxy-

gen sensor (rear) is lower than 0.508 volt.

NOTE: Monitoring stops after fuel has been shut off
for more than 64 seconds.

.

Yes

No

Yes

Yes

No

Monitoring

conditions

No

No

Malfunction

Good

Output voltage

change < 0.313V

Go/stop operation

for specified times

Yes

AK800936

*: See DTC SET CONDITIONS-Judgment Criterion

Maximum output

voltage <= 0.508V

End

Start

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-261

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 13

P.13A-11

.

.

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

• Heated oxygen sensor (rear) deteriorated.

• 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

STEP 1. Using scan tool MB991958, check data list item
AD: Heated Oxygen Sensor (rear).

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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

AD, Heated Oxygen Sensor (rear).

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min

• The output voltages should be between 0.6 and 1.0

volt.

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

.

NO : Replace the heated oxygen sensor (rear). Then go to

Step 2.

STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 13

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0140 set?

YES : Refer to DTC P0137

− Heated Oxygen Sensor (rear)

Circuit Low Voltage

P.13A-241

, DTC P0138

− Heated

Oxygen Sensor (rear) Circuit High Voltage

P.13A-249

.

NO : The inspection is complete.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-262

DTC P0171: System too Lean

.

Fuel Trim Circuit

• Refer to DTC P0201 − Injector Circuit-Cylinder 1

P.13A-292

, DTC P0202

− Injector Circuit-Cylin-

der 2

P.13A-302

, DTC P0203

− Injector Cir-

cuit-Cylinder 3

P.13A-312

, DTC P0204

− Injector

Circuit-Cylinder 4

P.13A-322

.

.

CIRCUIT OPERATION

• Refer to DTC P0201 − Injector Circuit-Cylinder 1

P.13A-292

, DTC P0202

− Injector Circuit-Cylin-

der 2

P.13A-302

, DTC P0203

− Injector Cir-

cuit-Cylinder 3

P.13A-312

, DTC P0204

− Injector

Circuit-Cylinder 4

P.13A-322

.

.

TECHNICAL DESCRIPTION

• If a malfunction occurs in the fuel system, the fuel

trim value becomes too large.

• The ECM checks whether the fuel trim value is

within a specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Air/fuel learning value (long time fuel trim) and

air/fuel feedback integral value (short time fuel
trim) are too lean.

.

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)

• Misfire monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

.