Mitsubishi Outlander GS45X. Manual - part 572

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-111

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• More than 220 seconds have passed since the 

engine starting sequence was completed.

• While the linear air-fuel ratio sensor heater is on.

• Battery positive voltage is between 11 and 16.5 

volts.

• Intake air temperature is more than −10°C (14°F).

• On duty cycle of the linear air-fuel ratio sensor 

heater is between 3 and 97 percent.

Judgement Criterion

• The linear air-fuel ratio sensor heater current has 

continued to be lower than average 1.25 ampere 
for 10 seconds.

.

OBD-II DRIVE CYCLE PATTERN

• Refer to Diagnostic 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 circuit harness dam-

age or connector damage.

• Linear air-fuel ratio sensor heater failed.

• ECM failed. 

End

No

No

No

Malfunction

Good

Heater current

< 1.25 A

AK900351

Start

Yes

Yes

Yes

Continuous
failure for 10secs

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-112

DIAGNOSIS

STEP 1. Check harness connector C-142 at linear air-fuel 
ratio sensor 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 8.

STEP 2. Check the linear air-fuel ratio sensor.
(1) Disconnect the linear air-fuel ratio sensor connector C-142.
(2) Measure the resistance between linear air-fuel ratio sensor 

connector terminal No. 2 and terminal No. 3.

Standard value: 2.3 

− 4.2 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 2.3 and 4.2 ohms 

[at 20

°C (68°F)]?

YES : Go to Step 3.
NO :  Replace the linear air-fuel ratio sensor. Then go to 

Step 8.

STEP 3. Check harness connector A-33X at the MFI relay 
for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 8.

STEP 4. Check for harness damage between MFI relay 
connector A-33X (terminal No. 2) and linear air-fuel ratio 
sensor connector C-142 (terminal No. 3).
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it. Then go to Step 8.

STEP 5. Check harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 8.

AK900847

3

2

1

6

5

4

Linear air-fuel 
ratio sensor 
connector

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-113

STEP 6. Check for harness damage between linear air-fuel 
ratio sensor connector C-142 (terminal No. 2) and ECM 
connector B-10 (terminal No. 34).
NOTE: Check harness after checking intermediate connector 
A-13. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 8.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 8.

STEP 7. Check the trouble symptoms.
(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 P0053 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 8.

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 8. 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 P0053 set?

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

DTC P0068: Mass Airflow Sensor Plausibility

.

TECHNICAL DESCRIPTION

Compare the actual measurement of volumetric effi-
ciency by a mass airflow sensor signal with volumet-
ric efficiency estimated from a throttle position 
sensor (main or sub) signal.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-114

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• The plausibility error of the throttle position sen-

sor (main) is detected.

• The plausibility error of the throttle position sen-

sor (sub) is detected.

Judgment Criterion

• For 0.36 second, the difference between the volu-

metric efficiency estimated by the throttle position 
sensor (main) and the volumetric efficiency esti-
mated by the throttle position sensor (sub) is 8.8 
percent or less.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle 

Pattern 17 

P.13A-11

.

.

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

• Mass airflow sensor system failed.

• ECM failed.

AK604352

Start

Yes

Yes

Yes

No

No

No

Continuous failure

for 0.36sec

Malfunction

End

Good

Monitoring
conditions

|Calculated Ec {TPS (main)}

-calculated Ec {TPS (sub)}| 

< 8.8 percent

Ec: load value