Mitsubishi Outlander GS45X. Manual — part 569

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-99

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CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal

No. 2) to the heated oxygen sensor (rear) heater.

• The ECM (terminal No. 35) controls continuity to

the heated oxygen sensor (rear) heater by turn-
ing the power transistor in the ECM "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

Heated oxygen sensor (rear) heater current or volt-

age 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

.

AK704087AB

Connector: A-13

A-13

AK704088

MFI relay

AB

Connector: A-33X

A-33X

AK704090AB

Connector: B-10

B-10 (GR)

AK900595

Connector: C-129

C-129

AB

AK900665

D-37 (B)

Rear heater duct (RH)

Heated oxygen
sensor (rear)

AB

Connector: D-37

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• More than 2 seconds have passed since the

engine starting sequence was completed.

• While the heated oxygen sensor (rear) heater is

on.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The heated oxygen sensor (rear) 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 heated oxygen sensor (rear) heater is

off.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The heated oxygen sensor (rear) heater voltage

has continued to be lower than 2.0 volts for 2 sec-
onds.

.

End

No

No

Malfunction

Good

Current < 0.17A

or

Current > 10.5A

Voltage < 2.0V

AK900352

Heater activation
command ON

No

No

Start

Yes

Yes

Yes

Yes

Yes

No

Continuous
failure for 2secs

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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OBD-II DRIVE CYCLE PATTERN

• Refer to Diagnostic Function − OBD-II Drive

Cycle

− Pattern 2

P.13A-11

.

.

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

• Open or shorted heated oxygen sensor (rear)

heater circuit, harness damage, or connector
damage.

• Heated oxygen sensor (rear) heater failed.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

STEP 1. Check harness connector D-37 at the heated
oxygen sensor (rear) 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 11.

STEP 2. Check the heated oxygen sensor (rear).
(1) Disconnect heated oxygen sensor (rear) connector D-37

and connect test harness special tool, MB991658, to the
connector on the heated oxygen sensor (rear) side.

(2) Measure the resistance between heated oxygen sensor

connector terminal No. 1 and terminal No. 2.

Standard value: 4.5

− 8.0 ohms [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 heated oxygen sensor (rear). Then go to

Step 11.

STEP 3. Measure the power supply voltage at heated
oxygen sensor (rear) harness side connector D-37.
(1) Disconnect the connector D-37 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 5.
NO : Go to Step 4.

AK604492AB

MB991658

Heated oxygen
sensor component
side connector

AK604172

2 1
4 3

D-37 harness
connector:
component side

AG

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 4. Check harness connector A-33X at the MFI relay
for damage.
Q: Is the harness connector in good condition?

YES : Check harness connector C-129 at intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector is in

good condition, repair harness wire between MFI
relay connector A-33X (terminal No. 2) and heated
oxygen sensor (rear) connector D-37 (terminal No. 1)
because of open circuit or short circuit to ground.
Then go to Step 11.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

STEP 5. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.