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Mitsubishi Outlander GS45X. Manual - part 611

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-267

STEP 8. Check the injector.
(1) Disconnect the injector connector B-101, B-120, B-103 and

B-116.

(2) Measure the resistance between each injector side

connector terminal No. 1 and No. 2.

Standard value: 10.5

− 13.5 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms

[at 20

°C (68°F)]?

YES : Go to Step 9.
NO : Replace the injector. Then go to Step 14.

STEP 9. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 14.

STEP 10. Check for harness damage between injector
connector and ECM connector.

a. Check the harness wire between injector connector B-101

(terminal No. 2) and ECM connector B-10 (terminal No. 2)
at No. 1 cylinder injector.

b. Check the harness wire between injector connector B-120

(terminal No. 2) and ECM connector B-10 (terminal No.3) at
No. 2 cylinder injector.

c. Check the harness wire between injector connector B-103

(terminal No. 2) and ECM connector B-10 (terminal No. 18)
at No. 3 cylinder injector.

d. Check the harness wire between injector connector B-116

(terminal No. 2) and ECM connector B-10 (terminal No. 19)
at No. 4 cylinder injector.

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 14.

STEP 11. Check the fuel pressure.
Refer to On-vehicle Service

− Fuel Pressure Test

P.13A-868

Q: Is the fuel pressure normal?

YES : Go to Step 12.
NO : Repair it. Then go to Step 14.

STEP 12. Check for entry of foreign matter (water,
kerosene, etc.) into fuel.
Q: Are there any abnormalities?

YES : Replace the fuel. Then go to Step 14.
NO : Go to Step 13.

AK604038

1 2

Injector side
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-268

STEP 13. Replace the injector.
(1) Replace the injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 21

P.13A-11

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0171 set?

YES : Replace the ECM. When the ECM is replaced,

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

. Then go to Step 14.

NO : The inspection is complete.

STEP 14. 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 21

P.13A-11

(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0171 set?

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

DTC P0172: System too Rich

Fuel Trim Circuit

• Refer to DTC P0201 − Injector Circuit-Cylinder 1

P.13A-292

, DTC P0202

− Injector Circuit-Cylin-

der 2

P.13A-302

, DTC P0203

− Injector Cir-

cuit-Cylinder 3

P.13A-312

, DTC P0204

− Injector

Circuit-Cylinder 4

P.13A-322

CIRCUIT OPERATION

• Refer to DTC P0201 − Injector Circuit-Cylinder 1

P.13A-292

, DTC P0202

− Injector Circuit-Cylin-

der 2

P.13A-302

, DTC P0203

− Injector Cir-

cuit-Cylinder 3

P.13A-312

, DTC P0204

− Injector

Circuit-Cylinder 4

P.13A-322

TECHNICAL DESCRIPTION

• If a malfunction occurs in the fuel system, the fuel

trim value becomes too small.

• The ECM checks whether the fuel trim value is

within a specified range.

DESCRIPTIONS OF MONITOR METHODS

Air/fuel learning value (long time fuel trim) and

air/fuel feedback integral value (short time fuel
trim) are too rich.

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)

• Misfire monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-269

DTC SET CONDITIONS
Logic Flow Chart

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 76°C

(169

°F).

• Mass airflow sensor output is 9 g/sec or more.

Judgement Criterion

• Long-term fuel trim has continued to be lower

than

−12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be lower

than

−10.2 percent for 5 seconds.

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 76°C

(169

°F).

• Mass airflow sensor output is 9 g/sec or less.

Judgement Criterion

• Long-term fuel trim has continued to be lower

than

−12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be lower

than

−15.2 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 76°C

(169

°F).

• Under the closed loop air/fuel ratio control.

End

Malfunction

Good

AK604328

Start

Yes

Continuous

failure for 5secs

Monitoring
conditions

LRN

>= K0

LRN

<= K2

>= K1

<= K3

LRN

: Long-term trim

: Short-term trim

K0 : Maximum limit of long-term trim

K2 : Minimum limit of long-term trim

K1 : Maximum limit of short-term trim

K3 : Minimum limit of short-term trim

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-270

Judgement Criterion

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

percent for 2 seconds.

• Short-term fuel trim has continued to be −25.0

percent for 2 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 21

P.13A-11

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set are:)

• Mass airflow sensor failed.

• Injector failed.

• Incorrect fuel pressure.

• Engine coolant temperature sensor failed.

• Intake air temperature sensor failed.

• Barometric pressure sensor failed.

• Manifold absolute pressure sensor failed.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 10:
Mass 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

10, Mass Airflow Sensor.

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

°C

to 95

°C (176°F to 203°F).

• When idling, between 1,350 and 1,670 millivolts.

• When 2,500 r/min, between 1,620 and 2,020 millivolts.

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

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

− Mass Airflow Circuit

Range/Performance Problem

P.13A-121