Mitsubishi Outlander GS45X. Manual - part 602

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-231

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

• Linear air-fuel ratio sensor failed.

• Shorted linear air-fuel ratio sensor circuit, or con-

nector 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. Check harness connector C-142 at linear air-fuel 
ratio sensor and harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 7.

STEP 2. Check for short circuit to power supply between 
linear air-fuel ratio sensor connector C-142 (terminal No. 4) 
and ECM connector B-10 (terminal No. 38).
NOTE: Check harness after checking intermediate connector 
A-12. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 7.
Q: Is the harness wire in good condition?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 7.

STEP 3. Check for short circuit to power supply between 
linear air-fuel ratio sensor connector C-142 (terminal No. 1) 
and ECM connector B-10 (terminal No. 56).
NOTE: Check harness after checking intermediate connector 
A-12. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 7.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO :  Repair it. Then go to Step 7.

STEP 4. Check for short circuit to power supply between 
linear air-fuel ratio sensor connector C-142 (terminal No. 5) 
and ECM connector B-10 (terminal No. 39).
NOTE: Check harness after checking intermediate connector 
A-12. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 7.
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it. Then go to Step 7.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-232

STEP 5. Test the OBD-II drive cycle.

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 and delete the 

DTC.

(3) Carry out the test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 22 

P.13A-11

.

(4) Check the diagnostic trouble code (DTC).
Q: Is DTC P0132 set?

YES : Then go to Step 6.
NO :  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

.

STEP 6. 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 22 

P.13A-11

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0132 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

. Then go to Step 7.

NO :  The inspection is complete.

STEP 7. 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 22 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0132 set?

YES : Retry the troubleshooting.
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-233

DTC P0133: Linear Air-Fuel Ratio Sensor Circuit Slow Response

.

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

• If the response speed of the linear air-fuel ratio 

sensor to the change in the air-fuel ratio is too 
slow, the DTC is stored as the linear air-fuel ratio 
sensor deterioration.

.

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 heater 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

.

AK704090AB

Connector: B-10

B-10 (GR)

AK704089AD

Linear air-fuel
ratio sensor

SRS-ECU

Connector: C-142

C-142 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-234

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Engine speed is between 1,219 and 3,000 r/min.

• Volumetric efficiency is between 27.5 and 70 per-

cent.

• Engine coolant temperature is more than 60°C 

(140

°F).

• Under the closed loop air/fuel control.

• The accelerator pedal is depressed.

• Short-term fuel trim is between −25 and +25 per-

cent.

• More than 3 seconds have passed after the 

above mentioned conditions have been met.

• During the drive cycle, the ECM performs moni-

toring with the accumulated total time of 10 sec-
onds, 5 times.

End

Malfunction

No

No

F0, F1: Threshold valve

Good

AK900412

Start

Yes

No

Yes

No

Yes

Yes

Ff >= F1

Ff < F0

Monitoring
conditions

Specified times monitored?

Calculate switching frequency of 

A/F sensor output signal (Ff)

Calculate average switching frequency

(Ff)