Mitsubishi Outlander GS45X. Manual - part 603

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-235

Judgement Criteria

• The average frequency is less than 8 times.

• The frequency is less than 13 times.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnosis 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.

• Connector damage.

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 3.

STEP 2. 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 1 

P.13A-11

.

(4) Check the diagnostic trouble code (DTC).
Q: Is DTC P0133 set?

YES : Replace the linear air-fuel ratio sensor. Then go to 

Step 3.

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

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-236

STEP 3. 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 1 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0133 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

DTC P0134: Linear Air-Fuel Ratio Sensor Circuit No Activity Detected

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

P

3

2

1

6

5

4

AKA00449

1

12 13 14 15 16 1718 19 20 2122 2324

2 3 4 5

6 7 8 9 10 11

LINEAR AIR-FUEL RATIO SENSOR CIRCUIT

LINEAR 
AIR-FUEL 
RATIO 
SENSOR

FROM 
MFI RELAY

WHITE

BLA

CK

RED

WHITE

BLA

CK

RED

C-142

ENGINE
CONTROL
MODULE

38

39

56

4

5

1

14

20

21

2

6

3

B-10

A-12

AC

TO ECM TO ECM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-237

.

CIRCUIT OPERATION

The linear air-fuel ratio sensor and the ECM are con-
nected by the following three lines to detect the 
air-fuel ratio.

• The line between the linear air-fuel ratio sensor 

(terminal No. 1) and the ECM (terminal No. 56) 
detects the air-fuel ratio. 

• The auxiliary line between the linear air-fuel ratio 

sensor (terminal No. 4) and the ECM (terminal 
No. 38) detects the air-fuel ratio.

• The line between the linear air-fuel ratio sensor 

(terminal No. 5) and the ECM (terminal No. 39) is 
connected to ground.

.

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

• The linear air-fuel ratio sensor is heated by the 

linear air-fuel ratio sensor heater or the exhaust 
gas. If the linear air-fuel ratio sensor remains not 
activated although being under the conditions 
where it can sufficiently be activated, the DTC is 
stored as a malfunction.

.

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

.

AKA00842 AB

Connector: A-12

A-12

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

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-238

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Battery positive voltage is between 10 and 16.5 

volts.

• More than 220 seconds have passed since the 

engine starting sequence was completed.

Judgement Criterion

• The sensor impedance is be higher than 100 

ohms for 10 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnosis Function 

− OBD-II Drive Cycle − 

Pattern 22 

P.13A-11

.

.

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

• Linear air-fuel ratio sensor failed.

• Open linear air-fuel ratio sensor circuit, harness 

damage or connector damage.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

End

No

No

Malfunction

Good

10secs have passed?

AK900361

Start

Yes

No

Yes

Yes

Monitoring
conditions

Sensor impedance 

> 100 ohm