Mitsubishi Outlander GS45X. Manual — part 566

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-87

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal

No. 2) to the linear air-fuel ratio sensor heater.

• The ECM (terminal No. 34) controls continuity to

the linear air-fuel ratio sensor heater by turning
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

Linear air-fuel ratio sensor heater current 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

.

AK704087AB

Connector: A-13

A-13

AK704088

MFI relay

AB

Connector: A-33X

A-33X

AK704090AB

Connector: B-10

B-10 (GR)

AK704089AD

Linear air-fuel
ratio sensor

SRS-ECU

Connector: C-142

C-142 (B)

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 linear air-fuel ratio sensor heater is on.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The linear air-fuel ratio sensor heater current has

continued to be lower than average 0.17 ampere
for 2 seconds.

Check Conditions

• More than 2 seconds have passed since the

engine starting sequence was completed.

• While the linear air-fuel ratio sensor heater is off.

• Battery positive voltage is between 11 and 16.5

volts.

Judgement Criterion

• The linear air-fuel ratio sensor heater voltage has

continued to be lower than average 2.0 volts for 2
seconds.

.

OBD-II DRIVE CYCLE PATTERN

• Refer to Diagnostic Function − OBD-II Drive

Cycle

− Pattern 2

P.13A-11

.

.

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

• Open or shorted linear air-fuel ratio sensor heater

circuit, harness damage or connector damage.

• Linear air-fuel ratio sensor heater failed.

• ECM failed.

DIAGNOSIS

Required Special Tool:

• MB992110: Power Plant ECU Check Harness

STEP 1. Check harness connector C-142 at linear air-fuel
ratio sensor 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 linear air-fuel ratio sensor.
(1) Disconnect the linear air-fuel ratio sensor connector C-142.
(2) Measure the resistance between linear air-fuel ratio sensor

connector terminal No. 2 and terminal No. 3.

Standard value: 2.3

− 4.2 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 2.3 and 4.2 ohms

[at 20

°C (68°F)]?

YES : Go to Step 3.
NO : Replace the linear air-fuel ratio sensor. Then go to

Step 11.

STEP 3. Measure the power supply voltage at linear air-fuel
ratio sensor harness side connector C-142.
(1) Disconnect the connector C-142 and measure at the

harness side.

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

AK900847

3

2

1

6

5

4

Linear air-fuel
ratio sensor
connector

AB

AK900652

1

2

3

4

5

6

C-142 harness
connector:
component side

AE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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

YES : Repair harness wire between MFI relay connector

A-33X (terminal No. 2) and linear air-fuel ratio sensor
connector C-142 (terminal No. 3) 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.