Mitsubishi Outlander GS45X. Manual - part 844

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-309

STEP 10. Check the right bank injector.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector B-101, B-103,

B-104.

(3) Measure the resistance between 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 : Repair harness wire between injector intermediate

connector and right bank injector connector because
of harness damage. Then go to Step 16.

NO : Replace the injector. Then go to Step 16.

STEP 11. Check for harness between the right bank
injector connector B-101, B-103, B-104 and the ECM
connector B-10.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector B-101, B-103,

B-104 and the ECM connector B-10.

(3) Measure the resistance between the right bank injector

connector B-101, B-103, B-104 and the ECM connector
B-10.

a. Connector B-101 (terminal No. 2) and connector B-10

(terminal No. 2) at No. 1 cylinder injector.

b. Connector B-103 (terminal No. 2) and connector B-10

(terminal No. 18) at No. 3 cylinder injector.

c. Connector B-104 (terminal No. 2) and connector B-10

(terminal No.50) at No. 5 cylinder injector.

• Should be less than 2 ohms.

Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 16.

STEP 12. Check for exhaust leaks.
Q: Are there any abnormalities?

YES : Repair it. Then go to Step 16.
NO : Go to Step 13.

AK700204

1 2

Injector side
connector

AK700552

16 15 14 13 12 11 10 9 8 7 6 5 4 3

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

B-101, B-103, B-104,
harness connector:
component side

B-10 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-310

STEP 13. Check for intake system vacuum leak.
Q: Are there any abnormalities?

YES : Repair it. Then go to Step 16.
NO : Go to Step 14.

STEP 14. Check for entry of foreign matter (water,
kerosene, etc.) into fuel.
Q: Are there any abnormalities?

YES : Replace the fuel. Then go to Step 16.
NO : Go to Step 15.

STEP 15. Replace the right bank injector.
(1) Replace the right bank injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 20

P.13B-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 16.

NO : The inspection is complete.

STEP 16. 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 20

P.13B-11

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

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

DTC P0172: System too Rich (bank 1)

Fuel Trim Circuit

• Refer to DTC P0201 − Injector Circuit Malfunction

− Cylinder 1

P.13B-345

, DTC P0203

− Injector

Circuit Malfunction

− Cylinder 3

P.13B-360

, DTC

P0205

− Injector Circuit Malfunction − Cylinder 5

P.13B-375

CIRCUIT OPERATION

• Refer to DTC P0201 − Injector Circuit Malfunction

− Cylinder 1

P.13B-345

, DTC P0203

− Injector

Circuit Malfunction

− Cylinder 3

P.13B-360

, DTC

P0205

− Injector Circuit Malfunction − Cylinder 5

P.13B-375

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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-311

DESCRIPTIONS OF MONITOR METHODS

Right bank 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

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-312

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 12 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

−7.4 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 12 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

−12.5 percent for 5 seconds.

End

Malfunction

Good

AK703881

Start

Yes

Continuous failure

for specified time

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

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