Mitsubishi Galant (2004+). Manual - part 1103

 

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Mitsubishi Galant (2004+). Manual - part 1103

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-105

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Repeat 5 or more times: drive

*1

, stop

*2

.

Drive

*1

: vehicle speed higher than 50 km/h (31 

mph) lasting a total of more than 60 seconds.

Stop

*2

: vehicle speed lower than 1.5 km/h (1.0 

mph) lasting more than 30 seconds.

Judgement Criteria

• Changes in the intake air temperature is lower 

than 1

°C (1.8°F).

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

 Other Monitor 

P.13B-5

.

.

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

• Intake air temperature sensor failed.

• Open or intake air temperature sensor circuit, 

harness damage, or connector damage.

• PCM failed.

END

YES

NO

NO

NO

START

MONITORING

CONDITION

YES

MALFUNCTION

GOOD

INTAKE AIR TEMP.

CHANGES

GO/STOP OPERATION

FOR SPECIFIED TIMES

YES

AK302383

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-106

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 13: 
Intake Air Temperature Sensor.

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 

13, Intake Air Temperature Sensor.

(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 

P.00-6

.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AK203040 AB

INTAKE AIR 
TEMPERATURE 
SENSOR

MASS AIRFLOW 
SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-107

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

B-10.

(2) Measure the resistance between intake air temperature 

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

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

drier.

Standard value:

13 

 17 k [at 20°C (4°F)]

5.3 

 6.7 k [at 0°C (32°F)]

2.3 

 3.0 k [at 20°C (68°F)]

1.0 

 1.5 k [at 40°C (104°F)]

0.56 

 0.76 k [at 60°C (140°F)]

0.30 

 0.45 k [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 B-10 at the intake air 
temperature sensor 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.

AK303015

2

1

3

4

AB

B-10 (GR)

CONNECTOR: B-10

HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

3 4

AK203041

INTAKE AIR TEMPERATURE
SENSOR CONNECTOR

AB

AK203040 AB

INTAKE AIR 
TEMPERATURE 
SENSOR

MASS AIRFLOW 
SENSOR

AK303015

2

1

3

4

AB

B-10 (GR)

CONNECTOR: B-10

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-108

STEP 4. Check the continuity at intake air temperature 
sensor harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness 

side.

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

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

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

STEP 5. Check harness connector B-21 at PCM 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.

AK303015

2

1

3

4

AB

B-10 (GR)

CONNECTOR: B-10

HARNESS
CONNECTOR:
COMPONENT SIDE

2

1

3

4

AK303019

B-10 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

 

 

 

 

 

 

 

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