Mitsubishi Montero Sport (2004+). Manual - part 244

 

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Mitsubishi Montero Sport (2004+). Manual - part 244

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-389

Check Conditions

• Engine coolant temperature is lower than approx-

imately 100

°C (212°F) when the engine is 

started.

• Intake air temperature is lower than 60°C (140°F) 

when the engine is started.

• 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 higher 

than +12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be higher 

than +12.5 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 

approximately 100

°C (212°F) when the engine is 

started.

• Intake air temperature is higher than 60°C 

(140

°F) when the engine is started.

• 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 higher 

than +12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be higher 

than +17.6 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 

approximately 100

°C (212°F) when the engine is 

started.

• Intake air temperature is higher than 60°C 

(140

°F) when the engine is started.

• 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 higher 

than +12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be higher 

than +22.3 percent for 5 seconds.

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 +25 per-

cent 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.

• Exhaust leak.

• Use of incorrect or contaminated fuel.

• Harness damage in injector.

• Connector damage.

• Intake system vacuum leaks.

• PCM failed.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-390

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check for exhaust leaks.
Q: Are there any abnormalities?

YES : Go to Step 2.
NO :  Repair it. Then go to Step 16.

STEP 2. Check for intake system vacuum leaks.
Q: Are there any abnormalities?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 16.

STEP 3. 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 203°F).

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

7.6 gm/s).

• When 2,500 r/min, between 18 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 4.
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-391

STEP 4. 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 5.
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 5. 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 6.
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-392

STEP 6. 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 7.
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 7. Check harness connector A-04 at injector 
intermediate connector 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 16.

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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