Mitsubishi Montero Sport (2004+). Manual - part 246

 

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Mitsubishi Montero Sport (2004+). Manual - part 246

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-397

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C 

(171

°F).

• Volume airflow sensor output frequency is 100 Hz 

or more.

Judgment Criteria

• Long-term fuel trim has continued to be lower 

than 

−12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be lower 

than 

−7.4 percent for 5 seconds.

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C 

(171

°F).

• Volume airflow sensor output frequency is 100 Hz 

or less.

Judgment Criteria

• Long-term fuel trim has continued to be lower 

than 

−12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be lower 

than 

−12.5 percent for 5 seconds.

K

LRN

: LONG-TERM TRIM

K

I

: SHORT-TERM TRIM

K0 : MAXIMUM LIMIT OF LONG-TERM TRIM
K1 : MAXIMUM LIMIT OF SHORT-TERM TRIM
K2 : MINIMUM LIMIT OF LONG-TERM TRIM
K3 : MINIMUM LIMIT OF SHORT-TERM TRIM

START

MONITORING

CONDITIONS

END

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

K

LRN

 > K0

MALFUNCTION

GOOD

K

LRN

 < K2

K

I

< K3

K

I

> K1

CONTINUOUS FAILURE

FOR 5secs

AK204050

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-398

Check Conditions

• Engine coolant temperature is higher than 77°C 

(171

°F).

• Under the closed loop air/fuel ratio control.

Judgment Criteria

• Long-term fuel trim has continued to be −12.5 

percent for 5 seconds.

or

• Short-term fuel trim has continued to be −30.0 

percent for 5 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 2 

− Fuel Trim Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 

causes for this code to be set are:)

• Volume airflow sensor failed.

• Injector (Number 2, 4, 6) failed.

• Incorrect fuel pressure.

• Engine coolant temperature sensor failed.

• Intake air temperature sensor failed.

• Barometric pressure sensor failed.

• Connector damage.

• PCM failed.

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 12: 
Volume Airflow 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 

12, Volume Airflow Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C 

to 95

°C (176°F to 205°F).

• When idling, between 18 and 44Hz (between 3.7 and 

7.6 gm/s).

• When 2,500 r/min, between 58 and 98 Hz  (between 

11.9 and 17.9 gm/s).

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES :  Go to Step 2.
NO :  Refer to, DTC P0101 

− Volume Airflow Circuit 

Range/Performance Problem 

P.13A-33

, DTC P0102 

− Volume Airflow Circuit Low Input 

P.13A-42

.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-399

STEP 2. Using scan tool MB991958, check data list item 13: 
Intake Air Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item 

13, Intake Air Temperature Sensor.

• The intake air temperature and temperature shown with 

the scan tool should approximately match.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 3.
NO :  Refer to, DTC P0111 

− Intake Air Temperature Circuit 

Range/Performance Problem 

P.13A-89

, DTC P0112 

− Intake Air Temperature Circuit Low Input 

P.13A-97

, 

DTC P0113 

− Intake Air Temperature Circuit High 

Input 

P.13A-103

.

STEP 3. Using scan tool MB991958, check data list item 21: 
Engine Coolant Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item 

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature 

shown with the scan tool should approximately match.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 4.
NO :  Refer to, DTC P0116 

− Engine Coolant Temperature 

Circuit Range/Performance Problem

P.13A-111

, DTC 

P0117 

− Engine Coolant Temperature Circuit Low 

Input 

P.13A-122

, DTC P0118 

− Engine Coolant 

Temperature Circuit High Input 

P.13A-128

.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-400

STEP 4. Using scan tool MB991958, check data list item 25: 
Barometric Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) 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).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 5.
NO :  Refer to, DTC P2227 

− Barometric Pressure Circuit 

Range/Performance Problem 

P.13A-684

, DTC P2228 

− Barometric Pressure Temperature Circuit Low Input 

P.13A-692

, DTC P2229 

− Barometric Pressure 

Temperature Circuit High Input 

P.13A-707

.

STEP 5. Check harness connector A-04 at injector 
intermediate connector 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 10. 

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE 
CONNECTOR

A-04(B)

 

 

 

 

 

 

 

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