Mitsubishi Outlander GS45X. Manual — part 822

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-221

DIAGNOSIS

STEP 1. Check the cooling system.
Refer to GROUP14, Engine Cooling Diagnosis

P.14-4

.

Q: Is the cooling system normal?

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

STEP 2. Test the OBD-II drive cycle.
(1) Carry out test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 10

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0128 set?

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

register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

.

NO : 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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-222

DTC P0131: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 1)

.

AK700138

1

2

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

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

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

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

2

1

4

3

AB

FROM MFI RELAY

1

2

3

4

55

BLA

CK-WHITE

VIOLET

54

B-10

B-03

MU802665

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

RIGHT BANK HEATED OXYGEN SENSOR (FRONT) CIRCUIT

RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)

AK900129 AD

Right bank heated
oxygen sensor (front)

Front exhaust
pipe RH

B-03 (GR)

Connector: B-03

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-223

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 54) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(front).

• Terminal No. 2 of the right bank heated oxygen

sensor (front) is grounded with ECM (terminal
No. 55).

• The ECM applies an offset voltage of 0.5 volt to

terminal No. 2 of the right bank heated oxygen
sensor (front).

.

TECHNICAL DESCRIPTION

• The right bank heated oxygen sensor (front)

detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the ECM.

• When the right bank heated oxygen sensor

(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.

• The ECM also checks for an open circuit in the

right bank heated oxygen sensor (front) output
voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Right bank heated oxygen sensor (front) output volt-
age is under specified range.

.

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)

• Heated oxygen sensor (front) heater monitor

• Misfire monitor

• Fuel system monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Barometric pressure sensor

• Throttle position sensor

• Accelerator pedal position sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-224

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Heated oxygen sensor offset voltage is between

0.4 and 0.6 volt.

• Battery positive voltage is between 11 and 16.5

volts.

• More than 180 seconds have passed since the

engine starting sequence was completed.

Judgement Criterion

• Right bank heated oxygen sensor (front) output

voltage is lower than 0.2 volt for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 21

P.13B-11

.

.

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

• Right bank heated oxygen sensor (front) failed.

• Harness damage

• Connector damage.

• 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

• MB991316: Test Harness

End

Malfunction

Yes

Yes

Yes

No

No

No

2secs have passed?

Output voltage

< 0.2V

Monitoring
conditions

Good

Start

AK700471