Mitsubishi Outlander GS45X. Manual — part 832

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-261

DTC SET CONDITION

Logic Flow Chart

.

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.

• Repeat 1 or more times: drive

*1

, stop

*2

.

Drive

*1

• 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

*2

:

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

mph).

AK800872

Start

End

No

No

No

No

Yes

Yes

Yes

Yes

Malfunction

Good

Maximum output
voltage <= V

1

Monitoring conditions

Output voltage

change < V

0

Go/stop operation

for specified times

V

0

, V

1

: Threshold valve

*: See DTC SET CONDITIONS-Judgment Criterion

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-262

Judgement Criterion

• Change in the output voltage of the right bank

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

or

• The maximum output voltage of the right 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: )

• 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

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).

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 right bank heated oxygen sensor (rear).

Then go to Step 2.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-263

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 P0140 set?

YES : Refer to 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 : The inspection is complete.

DTC P0151: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 1)

AK700140

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

39

RED

SKY BLUE

38

B-10

B-14

MU802605

FROM MFI RELAY

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

LEFT BANK HEATED OXYGEN SENSOR (FRONT) CIRCUIT

LEFT BANK HEATED
OXYGEN SENSOR (FRONT)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-264

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 38) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(front).

• Terminal No. 2 of the left bank heated oxygen

sensor (front) is grounded with or ECM (terminal
No. 39).

• The ECM applies an offset voltage of 0.5 volt to

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

.

TECHNICAL DESCRIPTION

• The left bank heated oxygen sensor (front)

detects the concentration of oxygen in the
exhaust gas; it converts that data to voltage, and
sends it to the ECM.

• When the left bank heated oxygen sensor (front)

begins to deteriorate, the heated oxygen sensor
signal response deteriorates also.

• The ECM also checks for the left bank heated

oxygen sensor (front) output voltage.

.

DESCRIPTIONS OF MONITOR METHODS

The left bank heated oxygen sensor (front) output
voltage 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

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

• Accelerator pedal position sensor

.

AK700404

Left bank heated oxygen
sensor (front)

Connector: B-14

AB

B-14 (B)

AK700401AB

ECM

B-10 (GR)

Connector: B-10