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Mitsubishi Outlander GS45X. Manual - part 569

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-99

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

Connector: A-33X

A-33X

AK704090AB

Connector: B-10

B-10 (GR)

AK900595

Connector: C-129

C-129

AK900665

D-37 (B)

Rear heater duct (RH)

Heated oxygen
sensor (rear)

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

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

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-101

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

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.

Content .. 567 568 569 570 ..