Mitsubishi Outlander GS45X. Manual - part 715

 

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Mitsubishi Outlander GS45X. Manual - part 715

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-683

.

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 heater or the 

exhaust gas heats the linear air-fuel ratio sensor 
to sufficiently activate the linear air-fuel ratio sen-
sor, resulting in the small resistance. However, 
the DTC is stored as an open circuit if the large 
resistance continues.

.

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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-684

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 Criteria

• The sensor impedance is be higher than 450 

ohms for 2 seconds.

• The reference circuit voltage is be lower than 5.3 

volts for 2 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, 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

End

No

No

No

Malfunction

(Reference circuit)

Malfunction

(Negative circuit)

Good

Sensor impedance

> 450 ohm

AK900359

Start

Yes

Yes

Yes

Continuous
failure for 2secs?

No

Yes

Reference circuit voltage 

>= 5.3 V

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-685

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 5.

STEP 2. Check for open circuit 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 5.
Q: Is the harness wire in good condition?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 5.

STEP 3. 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 P2251 set?

YES : Then go to Step 4.
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-686

STEP 4. 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 P2251 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 5.

NO :  The inspection is complete.

STEP 5. 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 P2251 set?

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

DTC P2252: Heated Oxygen Sensor Offset Circuit Low Voltage

AK704087AB

Connector: A-13

A-13

AK704090AB

Connector: B-10

B-10 (GR)

AK900595

Connector: C-129

C-129

AB

 

 

 

 

 

 

 

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