Mitsubishi Outlander GS45X. Manual — part 841

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-297

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.

• Fuel is being shut off.

• The left bank heated oxygen sensor (rear) output

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 left bank heated oxygen
sensor (rear) heater was turned on.

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

Judgement Criterion

• The left bank heated oxygen sensor (rear) output

voltage does not reach 0.2 volt for 6.0 seconds
from fuel cut start.

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.

• Fuel is being shut off.

• The left bank heated oxygen sensor (rear) output

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 left 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 left bank heated oxygen sensor (rear) output

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: )

• Left bank heated oxygen sensor (rear) deterio-

rated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-298

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).

(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 left 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 P0159 set?

YES : Refer to DTC 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 : 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-299

DTC P0160: Heated Oxygen Sensor Circuit No Activity Detected (bank 2, sensor 2)

.

AK700141

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

41

YELLO

W

ORANGE

40

B-10

B-13

MU802665

FROM MFI RELAY

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

LEFT BANK HEATED OXYGEN SENSOR (REAR) CIRCUIT

LEFT BANK HEATED
OXYGEN SENSOR (REAR)

AK700405AB

Left bank heated
oxygen sensor (rear)

Front
exhaust pipe

B-13 (GR)

Connector: B-13

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-300

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 40) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(rear).

• Terminal No. 2 of the left bank heated oxygen

sensor (rear) is grounded with ECM (terminal No.
41).

• The ECM applies an offset voltage of 0.5 volt to

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

.

TECHNICAL DESCRIPTION

• The output signal of the heated left bank oxygen

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

• The ECM checks for the left bank heated oxygen

sensor (rear) output voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Left bank heated oxygen sensor (rear) output voltage

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 (rear) heater monitor

• Heated oxygen sensor (front) heater monitor

• Heated oxygen sensor (front) inactive monitor

• Heated oxygen sensor offset voltage 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

.