Mitsubishi Lancer Evolution X. Manual - part 276

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-169

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 76° C 

(169° F).

• Repeat 2 or more times: drive

*1

, stop

*2

.

Drive

*1

: vehicle speed higher than 50 km/h (31 

mph) lasting a total of 60 seconds or more.

Stop

*2

: vehicle speed lower than 1.5 km/h (1.0 

mph) lasting 30 seconds or more.

Judgement Criterion

• Changes in the intake air temperature is lower 

than 1° C (1.8° F).

.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the intake air temperature is 25 ° C.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 7 

P.13A-9

.

.

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

• Intake air temperature sensor 1 failed.
• Harness damage or connector damage.
• ECM failed. 

End

Malfunction

Yes

Yes

No

No

Yes

No

Go/stop operation

for specified times

Intake air temp.

changes

Monitoring

conditions

Good

Start

AK604314

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-170

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, check data list item 5: 
Intake Air Temperature Sensor 1.

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) Remove the mass airflow sensor from the air intake hose.
(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to the data reading mode for item 

5, Intake Air Temperature Sensor 1.

(5) Heating the sensor using a hair drier.

• The indicated temperature increases.

NOTE: Do not allow it to increase over 80

°

C (176

°

F).

(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Attach the mass airflow sensor.
Q: Is the sensor operating properly?

YES : 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

.

NO :  Go to Step 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK302200 AD

Intake air 
temperature 
sensor 1

Mass airflow 
sensor

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 2. Check the intake air temperature sensor 1.
(1) Disconnect the intake air temperature sensor 1 connector 

A-07.

(2) Measure the resistance between intake air temperature 

sensor 1 side connector terminal No. 1 and No. 4.

(3) Measure resistance while heating the sensor using a hair 

drier.

Standard value:

13 − 17 kΩ [at − 20° C (− 4° F)]

5.4 − 6.6 kΩ [at 0° C (32° F)]

2.3 − 3.0 kΩ [at 20° C (68° F)]

1.0 − 1.5 kΩ [at 40° C (104° F)]

0.56 − 0.76 kΩ [at 60° C (140° F)]

0.31 − 0.43 kΩ [at 80° C (176° F)]

Q: Is the measured resistance at the standard value?

YES : Go to Step 3.
NO :  Replace the mass airflow sensor. Then go to Step 9.

STEP 3. Check harness connector A-07 at the intake air 
temperature sensor 1 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 9.

STEP 4. Check the continuity at intake air temperature 
sensor 1 harness side connector A-07.
(1) Disconnect the connector A-07 and measure at the harness 

side.

(2) Check for the continuity between terminal No. 4 and 

ground.

• Continuity (2 ohms or less)

Q: Does continuity exist?

YES : Go to Step 7.
NO :  Go to Step 5.

AK704242

3 4

2

1

AB

Intake air temperature
sensor 1 connector

AK604487AC

Intake air
temperature
sensor 1

AK704236

2 1

3

4

A-07 harness 
connector: 
component side

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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 9.

STEP 6. Check for harness damage between intake air 
temperature sensor 1 connector A-07 (terminal No. 4) and 
ECM connector B-10 (terminal No. 88).
Q: Is the harness wire in good condition?

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

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 9.

NO :  Repair it. Then go to Step 9.

STEP 7. Check harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 9.

STEP 8. Check for harness damage between intake air 
temperature sensor 1 connector A-07 (terminal No. 1) and 
ECM connector B-10 (terminal No. 89).
Q: Is the harness wire in good condition?

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

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 9.

NO :  Repair it. Then go to Step 9.

STEP 9. 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 7 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0111 set?

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