Mitsubishi Outlander GS45X. Manual - part 831

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-257

Check Conditions

• Engine coolant temperature is higher than 76°C 

(169

°F).

• The right bank heated oxygen sensor (front) is 

active.

• The cumulative mass airflow sensor output is 

higher than 1,638 g.

• Fuel is being shut off.

• The right bank heated oxygen sensor (rear) out-

put voltage is higher than 0.5 volt when fuel cut is 
started.

• It has been taking more than 180 seconds since 

the drive signal of the right bank heated oxygen 
sensor (rear) heater was turned on.

• Barometric pressure is higher than 76 kPa (22.4 

in.Hg).

Judgement Criterion

• The right bank heated oxygen sensor (rear) out-

put voltage does not reach 0.2 volt for 6.0 sec-
onds from fuel cut start.

Check Conditions

• Engine coolant temperature is higher than 76°C 

(169

°F).

• The right bank heated oxygen sensor (front) is 

active.

• The cumulative mass airflow sensor output is 

higher than 1,638 g.

• Fuel is being shut off.

• The right bank heated oxygen sensor (rear) out-

put voltage is higher than 0.5 volt when fuel cut is 
started.

• It has been taking more than 180 seconds since 

the drive signal of the right bank heated oxygen 
sensor (rear) heater was turned on.

• Barometric pressure is higher than 76 kPa (22.4 

in.Hg).

• The ECM monitors for this condition for 3 cycles 

of 0.5 second each during drive cycles.

Judgement Criteria

• The right bank heated oxygen sensor (rear) out-

put voltage does not reach 0.2 volt for 0.5 second 
from 0.4 volt while fuel is being shut off.

• The ECM monitors for this condition once during 

the drive cycle.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 11 

P.13B-11

.

.

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

• Right bank heated oxygen sensor (rear) 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-258

STEP 1. Using scan tool MB991958, check data list item 
AD: Heated Oxygen Sensor Bank 1, Sensor 2 (right 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 

AD, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

(4) Warm up the engine.

• After increasing the output voltage 0.5 volt or more by 

the engine revving, finish it. Then confirm that the output 
voltage reduces to 0.2 volt or less within 6 seconds.

(5) 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 right bank heated oxygen sensor (rear). 

Then 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 11 

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?

YES : Refer to DTC P0137 

− Heated Oxygen Sensor Circuit 

Low Voltage (bank 1, sensor 2) 

P.13B-244

, DTC 

P0138 

− Heated Oxygen Sensor Circuit High Voltage 

(bank 1, sensor 2) 

P.13B-250

.

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

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-259

DTC P0140: Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 2)

.

AK700139

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

1

2

3

4

57

PINK

LIGHT GREEN

56

B-10

B-02

MU802605

FROM MFI RELAY

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

RIGHT BANK HEATED OXYGEN SENSOR (REAR) CIRCUIT

RIGHT BANK HEATED
OXYGEN SENSOR (REAR)

AK900130AD

Right bank heated
oxygen sensor (rear)

Front exhaust
pipe RH

B-02 (B)

Connector: B-02

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-260

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 56) from the output terminal (terminal 
No. 4) of the right bank heated oxygen sensor 
(rear).

• Terminal No. 2 of the right bank heated oxygen 

sensor (rear) is grounded with ECM (terminal No. 
57).

• The ECM applies an offset voltage of 0.5 volt to 

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

.

TECHNICAL DESCRIPTION

• The output signal of the right bank heated oxygen 

sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).

• The ECM checks for the right bank heated oxy-

gen sensor (rear) output voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Right bank heated oxygen sensor (rear) output volt-

age does not change during specified.

.

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) monitor

• Heated oxygen sensor (front) inactive monitor

• Heated oxygen sensor offset voltage monitor

• Heated oxygen sensor (front) heater monitor

• Heated oxygen sensor (rear) heater monitor

• Air/fuel ratio feedback monitor

Sensor (The sensor below is determined to be 

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

.