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Mitsubishi Outlander GS45X. Manual - part 783

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-65

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal

No. 2) to the right bank heated oxygen sensor
(front) heater.

• The ECM (terminal No. 33) controls continuity to

the right bank heated oxygen sensor (front)
heater by turning the power transistor in the PCM
"ON" and "OFF".

TECHNICAL DESCRIPTION

• The ECM checks whether the heater current is

within a specified range when the heater is ener-
gized.

• The ECM checks whether the heater voltage is

within a specified range when the heater is not
energized.

DESCRIPTIONS OF MONITOR METHODS

Right bank heated oxygen sensor heater (front) cur-

rent or voltage is out of 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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

AK700399AB

MFI relay

A-33X

Connector: A-33X

AK700401AB

ECM

B-10 (GR)

Connector: B-10

AK900129 AD

Right bank heated
oxygen sensor (front)

Front exhaust
pipe RH

B-03 (GR)

Connector: B-03

AK900602

Connector: A-13

A-13

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-66

DTC SET CONDITION

Logic Flow Chart

Check Conditions

• More than 2 seconds have passed since the

engine starting sequence was completed.

• While the right bank heated oxygen sensor (front)

heater is on.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The right bank heated oxygen sensor (front)

heater current has continued to be lower than
0.17 ampere for 2 seconds.

Check Conditions

• More than 2 seconds have passed since the

engine starting sequence was completed.

• While the right bank heated oxygen sensor (front)

heater is off.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The right bank heated oxygen sensor (front)

heater voltage has continued to be lower than 2.0
volts for 2 seconds.

End

Malfunction

Good

Current < 0.17A

Current > 10.5A

Voltage < 2.0V

AK900352

Heater activation
command ON

Start

Yes

Continuous
failure for 2secs

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-67

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 2

P.13B-11

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

• Connector damage.

• Right bank heated oxygen sensor (front) heater.

• Harness damage

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991316: Test Harness

STEP 1. Check harness connector B-03 at the right bank
heated oxygen sensor (front) 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 or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 6.

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

connector B-03 and connect test harness special tool,
MB991316, to the connector on the right bank heated
oxygen (front) sensor side.

(2) Measure the resistance between heated oxygen sensor

connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).

Standard value: 4.5

− 8.0 Ω [at 20°C (68°F)]

Q: Is the measured resistance between 4.5 and 8.0 ohms

[at 20

°C (68°F)]?

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

Then go to Step 6.

STEP 3. Measure the power supply voltage at right bank
heated oxygen sensor (front) and harness side connector
B-03.
(1) Disconnect the connector B-03 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 4.
NO : Repair harness wire between the MFI relay connector

A-33X (terminal No. 2) and the right bank heated
oxygen sensor (front) connector B-03 (terminal No. 1)
because of open circuit or harness damage. Then go
to step 6.

AK700175

Heated
oxygent
sensor
component
side
connector

MB991316

Red

Blue

AK700176

B-03 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-68

STEP 4.Check for open circuit to ground or harness
damage between right bank heated oxygen sensor (front)
connector B-03 and ECM connector B-10.
(1) Disconnect the right bank heated oxygen sensor (front)

connector B-03 and the ECM connector B-10.

(2) Measure the resistance between the heated oxygen sensor

connector B-03 (terminal No. 3) and the ECM connector
B-10 (terminal No. 33).

• Should be less than 2 ohms.

(3) Check for the continuity between the oxygen sensor

connector B-03 (terminal No. 3) and ground.

• Not continuity.

Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO : Repair it. Then go to Step 6.

STEP 5. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 2

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0031 set?

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

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

. Then go to Step 6.

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

AK700177

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

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

B-03 harness connector:
component side

B-10 harness connector:
component side

AK703863

B-03 harness
connector:
component side

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