Mitsubishi Outlander GS45X. Manual - part 699

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-619

Judgement Criterion

• The amount of compensated rich air/fuel ratio is 

output by the heated oxygen sensor (rear). The 
status that the amount of compensated rich 
air/fuel ratio is greater than the specified amount 
continues for 5 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 1 

P.13A-11

.

.

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

• Linear air-fuel ratio sensor failed.

• Heated oxygen sensor (rear) failed.

• Injector failed.

• 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, read the diagnostic 
trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P2096 set?

YES : Refer to, Diagnostic Trouble Code Chart 

P.13A-49

.

NO :  Go to Step 2. 

STEP 2. Replace the linear air-fuel ratio sensor.
(1) Replace the linear air-fuel ratio sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 1 

P.13A-11

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2096 set?

YES :  Go to Step 3. 
NO :  The inspection is complete.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-620

STEP 3. Replace the heated oxygen sensor (rear).
(1) Replace the heated oxygen sensor (rear).
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 1 

P.13A-11

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2096 set?

YES :  Go to Step 4. 
NO :  The inspection is complete.

STEP 4. Replace the injector.
(1) Replace the injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 1 

P.13A-11

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2096 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

.

NO :  The inspection is complete.

DTC P2097: Post Catalyst Fuel Trim System too Rich

.

TECHNICAL DESCRIPTION

• The ECM effects air/fuel ratio feedback control in 

accordance with the signals from the linear 
air-fuel ratio sensor.

• If the linear air-fuel ratio sensor has deteriorated, 

corrections will be made by the heated oxygen 
sensor (rear).

.

DESCRIPTIONS OF MONITOR METHODS

• When an abnormality exists in the linear air-fuel 

ratio sensor, the amount of compensated fuel 
injection is abnormal. When this situation contin-
ues, it is judged to be faulty.

• If an abnormality exists in the heated oxygen sen-

sor (rear), also it is judged to be faulty even 
though the linear air-fuel ratio sensor is normal.

.

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

• Heated oxygen sensor (rear) monitor

• Linear air-fuel ratio sensor heater monitor

• Heated oxygen sensor (rear) heater monitor

• Heated oxygen sensor offset voltage monitor

• Misfire monitor

• Fuel system 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

• Accelerator pedal position sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-621

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is more than 76°C 

(169

°F).

• The closed loop air/fuel control continues for 

more than 10 seconds.

• More than 90 seconds have passed since the 

engine starting sequence was completed.

• Mass airflow sensor output is more than 8 g/sec.

• After the engine start, the accumulated time 

where the four conditions mentioned above are 
satisfied is more than 60 seconds.

Judgement Criterion

• The amount of compensated lean air/fuel ratio is 

output by the heated oxygen sensor (rear). The 
status that the amount of compensated lean 
air/fuel ratio is greater than the specified amount 
continues for 5 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 1 

P.13A-11

.

.

AKA00454

End

Malfunction

No

No

No

TAF <= TAFmin

TAF >= TAFmax

TAF: Fuel trim based on heated oxygen sensor (rear)
TAFmin: Minimum limit of TAF
TAFmax: Maximum limit of TAF

Good

AB

No

Start

Yes

Yes

Yes

Yes

Continuous
failure for 5secs

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-622

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

• Linear air-fuel ratio sensor failed.

• Heated oxygen sensor (rear) failed.

• Injector failed.

• 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, read the diagnostic 
trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P2097 set?

YES : Refer to, Diagnostic Trouble Code Chart 

P.13A-49

.

NO :  Go to Step 2. 

STEP 2. Replace the linear air-fuel ratio sensor.
(1) Replace the linear air-fuel ratio sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 1 

P.13A-11

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2097 set?

YES :  Go to Step 3. 
NO :  The inspection is complete.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector