Mitsubishi Outlander GS45X. Manual — part 828

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-245

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 off set 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 is under the 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

• Heated oxygen sensor (rear) heater monitor

• Heated oxygen sensor (front) 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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-246

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.

• 3 minutes or more have passed since the engine

starting sequence was completed.

Judgement Criterion

• Right bank heated oxygen sensor (rear) 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 (rear) failed.

• Connector damage.

• Harness 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

• MB998464: Test Harness

End

Malfunction

Yes

Yes

Yes

No

No

No

2secs have passed?

Output voltage

< 0.2V

Monitoring
conditions

Good

Start

AK700471

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-247

STEP 1. Check harness connector B-02 at the right bank
heated oxygen sensor (rear) and harness connector B-10
at the ECM for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO : Repair it. Refer to GROUP 00E, Harness Connector

Inspection

P.00E-2

. Then go to Step 5.

STEP 2. Check the right bank heated oxygen sensor (rear).
(1) Disconnect the right bank heated oxygen sensor (rear)

connector B-02 and connect test harness special tool,
MB998464, to the connector on the right bank heated
oxygen sensor (rear) side.

(2) Warm up the engine until engine coolant temperature

reaches 80

°C (176°F) or higher.

(3) Drive at 50 km/h (31 mph) or more for 10 minutes.
(4) Connect a digital voltage meter between terminal No. 2

(black clip) and terminal No. 4 (white clip).

(5) Measure the output voltage of heated oxygen sensor under

the following driving.

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

c. Engine: 3,500 r/min or more

Standard value: 0.6

− 1.0 volts

NOTE: If the temperature of sensing area does not reach
the high temperature [of approximately 400

°

C (752

°

F) or

more] even though the oxygen sensor is normal, the output
voltage would be possibly low in spite of the rich air-fuel
ratio.
NOTE: When the vehicle is driven with high loads, the tem-
perature of the sensing area of the heated oxygen sensor is
sufficiently high. Thus, it is not necessary to apply the volt-
age to the heater.

Q: Is the voltage between 0.6 and 1.0 volts?

YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (rear).

Then go to Step 5.

AK700554AB

Heated
oxygen
sensor
component
side
connector

MD998464

Black

White

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-248

STEP 3. Check for harness between the right bank heated
oxygen sensor (rear) connector B-02 and the ECM
connector B-10.
(1) Disconnect the right bank heated oxygen sensor (rear)

connector B-02 and the ECM connector B-10.

(2) Measure the resistance between the heated oxygen sensor

connector B-02 and the ECM connector B-10.

a. Connector B-02 (terminal No. 2) and connector B-10

(terminal No. 57).

b. Connector B-02 (terminal No. 4) and connector B-10

(terminal No. 56).

• Should be less than 2 ohms.

(3) Check for the continuity oxygen sensor connector B-02 and

ground.

a. Connector B-02 (terminal No. 2) and ground.
b. Connector B-02 (terminal No. 4) and ground.

• Not continuity.

Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it. Refer to GROUP 00E, Harness Connector

Inspection

P.00E-2

. Then go to Step 5.

AK703876

1

2

3

4

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

2

1

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

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

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

AB

B-03 harness
connector:
component side

B-10 harness
connector:
component side

1

2

3

4

AK700553AB

B-02 harness
connector:
component side