Mitsubishi Montero Sport (2004+). Manual - part 318

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-685

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the barometric 

pressure sensor power terminal (terminal No. 1) 
from the PCM (terminal No. 46). The ground ter-
minal (terminal No. 5) is grounded with PCM (ter-
minal No. 57).

• A voltage that is proportional to the atmospheric 

pressure is sent to the PCM (terminal No. 55) 
from the barometric pressure sensor output ter-
minal (terminal No. 2).

.

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The PCM checks whether this voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Barometric pressure sensor output voltage does not 

change for specified period. (approximately 1 
week)

.

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

.

AK103912AB

CONNECTOR: C-71

C-71

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-686

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Barometric pressure is lower than 76 kPa (22.4 

in.Hg).

Judgement Criteria

• During 15 times of driving, the changes in the 

sensor output voltage should measure 0.015 volt 
[equivalent to 0.4 kPa (0.12 in.Hg)] or less.

• Make sure that the engine coolant temperature is 

72

°C (162°F) or higher during each of the 15 

times of driving. Also, during each of the 15 times 
of driving, make sure that after the engine has 
been started, the engine coolant temperature has 
increased for 23

°C (73°F) or higher.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-4

.

.

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

• Barometric pressure sensor failed.

• Harness damage in barometric pressure sensor 

circuit, or connector damage.

• PCM failed.

START

MONITORING
CONDITIONS

CIRCUIT VOLTAGE

MALFUNCTION

CONTINUOUS

FAILURE FOR 2secs

NO

YES

YES

NO

< 6V

END

GOOD

NO

Yes

AK301455

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-687

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 25: 
Barometric Pressure 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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

25, Barometric Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).

• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).

• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 

in.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 

in.Hg).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
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.00-7

.

NO :  Go to Step 2.

STEP 2. Replace the airflow sensor.
(1) Replace the airflow sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2227 set?

YES : Go to Step 3.
NO :  The procedure is complete.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-688

STEP 3. Check connector A-01 at the barometric pressure 
sensor and connector C-90 at PCM for damage.
Q: is the 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 7.

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE