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Mitsubishi Outlander GS45X. Manual - part 842

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-301

DTC SET CONDITION

Logic Flow Chart

Check Conditions

• Engine coolant temperature is higher than 76°C

(169

°F).

• The left bank heated oxygen sensor (front) is

active.

• The cumulative mass airflow sensor output is

higher than 1,638 g.

• Repeat 1 or more times: drive

, stop

Drive

• Engine speed is higher than 1,500 r/min.

• Volumetric efficiency is higher than 40 per-

cent.

• Vehicle speed is higher than 30 km/h (19

mph).

• A total of more than 60 seconds have

elapsed with the above mentioned condi-
tions, and more than 3 seconds have
elapsed with the fuel shut off.

Stop

• Vehicle speed is lower than 1.5 km/h (1.0

mph).

AK800872

Start

End

Yes

Malfunction

Good

Maximum output
voltage <= V

Monitoring conditions

Output voltage

change < V

Go/stop operation

for specified times

, V

: Threshold valve

*: See DTC SET CONDITIONS-Judgment Criterion

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-302

Judgement Criterion

• Change in the output voltage of the left bank

heated oxygen sensor (rear) is lower than 0.313
volt.

• The maximum output voltage of the left bank

heated oxygen sensor (rear) is lower than 0.508
volt.

NOTE: Monitoring stops after fuel has been shut off
for more than 38 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 13

P.13B-11

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

• Left bank heated oxygen sensor (rear) deterio-

rated.

• ECM failed.

DIAGNOSIS

STEP 1. Using scan tool MB991958, check data list item
AF: Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

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

AF, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

a. Transaxle: 2nd speed
b. Drive with wide open throttle

c. Engine: 3,500 r/min

• The output voltages should be between 0.6 and 1.0

volt.

(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

− How to

Cope with Intermittent Malfunctions

P.00-15

NO : Replace the left bank heated oxygen sensor (rear).

Go to Step 2.

STEP 2. 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 13

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0160 set?

YES : Refer to P0157

− Heated Oxygen Sensor Circuit Low

Voltage (bank 2, sensor 2)

P.13B-284

, DTC P0158

−

Heated Oxygen Sensor Circuit High Voltage (bank 2,
sensor 2)

P.13B-290

NO : The inspection is complete.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

Next>>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-303

13B

DTC P0171: System too Lean (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 large.

• The ECM checks whether the fuel trim value is

within a specified range.

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 lean.

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

<< Previous

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-304

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine coolant temperature is lower than 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 76°C

(169

°F).

• Mass airflow sensor output is 12 g/sec or more.

Judgement Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be higher

than +7.4 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is lower than 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 76°C

(169

°F).

• Mass airflow sensor output is 12 g/sec or less.

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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