Mitsubishi Outlander GS45X. Manual - part 571

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-107

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 higher than 10.5 amperes for 
2 seconds.

.

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:)

• Heated oxygen sensor (rear) failed.

• ECM failed.

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

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-108

DIAGNOSIS

Required Special Tool:

• MB991658: Test Harness

STEP 1. 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 2.
NO :  Replace the heated oxygen sensor (rear). Then go to 

Step 3.

STEP 2. 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.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0038 set?

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

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 3.

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

. 

STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 2 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0038 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK604492AB

MB991658

Heated oxygen
sensor component
side connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-109

DTC P0053: Linear Air-Fuel Ratio Sensor Heater Resistance

AKA00444

1

3

2

4

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

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

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

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

3

2

1

6

5

4

P

1

10 111213 14 1516 17 1819 20

2 3 4

5 6 7 8 9

1

12 13 14 15 16 1718 19 20 2122 2324

2 3 4 5

6 7 8 9 10 11

LINEAR AIR-FUEL RATIO SENSOR HEATER CIRCUIT

20A

WHITE

WHITE

A-33X

MFI
RELAY

RELAY BOX
(ENGINE COMPARTMENT)

4

3

1

2

22

TO ECM

ENGINE
CONTROL
MODULE

34

57

B-10

36

FUSIBLE LINK

OFF

ON

AC

A-13

A-12

WHITE

LIGHT GREEN-BLA

CK

LIGHT GREEN-BLA

CK

GRA

Y

-BLA

CK

GRA

Y

-BLA

CK

LINEAR AIR-FUEL RATIO SENSOR

3

5

2

6

3

4

1

4

TO ECM

TO ECM

TO ECM

C-142

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-110

.

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.

.

DESCRIPTIONS OF MONITOR METHODS

 Linear air-fuel ratio sensor heater current 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)