Mitsubishi Lancer Evolution X. Manual - part 262

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-113

DIAGNOSIS

STEP 1. Using scan tool MB991958, check data list item 
DE: Intake Air Temperature Sensor 2.

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 intake air temperature sensor 2 from the intake 

manifold.

(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to the data reading mode for item 

DE, Intake Air Temperature Sensor 2.

(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 intake air temperature sensor 2.
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

AK403661 AE

Intake air temperature
sensor 2

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

B-16.

(2) Measure the resistance between intake air temperature 

sensor 2 side connector terminal No. 1 and No. 2.

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

drier.

Standard value:

13 − 18 kΩ [at − 20° C (− 4° F)]

5.1 − 6.9 kΩ [at 0° C (32° F)]

2.0 − 3.0 kΩ [at 20° C (68° F)]

0.9 − 1.5 kΩ [at 40° C (104° F)]

0.40 − 0.78 kΩ [at 60° C (140° F)]

0.23 − 0.42 kΩ [at 80° C (176° F)]

Q: Is the measured resistance at the standard value?

YES : Go to Step 3.
NO :  Replace the intake air temperature sensor 2. Then go 

to Step 9.

STEP 3. Check harness connector B-16 at the intake air 
temperature sensor 2 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.

AK704080

2

1

AB

Intake air temperature
sensor 2 connector

AK403661 AE

Intake air temperature
sensor 2

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 4. Check the continuity at intake air temperature 
sensor 2 harness side connector B-16.
(1) Disconnect the connector B-16 and measure at the harness 

side.

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

ground.

• Continuity (2 ohms or less)

Q: Does continuity exist?

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

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 2 connector B-16 (terminal No. 2) and 
ECM connector B-10 (terminal No. 97).
NOTE: Check harness after checking intermediate connector 
A-13. If intermediate connector is damaged, repair or replace it. 
Repair to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go to Step 9.

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.

1

2

AK704401

B-16 harness 
connector: 
component side

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 8. Check for harness damage between intake air 
temperature sensor 2 connector B-16 (terminal No. 1) and 
ECM connector B-10 (terminal No. 98).
NOTE: Check harness after checking intermediate connector 
A-13. If intermediate connector is damaged, repair or replace it. 
Repair to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go to Step 9.

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 P0096 set?

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