Mitsubishi Outlander GS45X. Manual - part 791

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-97

STEP 6. 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.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0051 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-98

DTC P0052: Heated Oxygen Sensor Heater Circuit High (bank 2, sensor 1)

AK700131

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

1

10 111213 14 1516 17 1819 20

2 3 4

5 6 7 8 9

2

1

4

3

AB

20A

WHITE

BLUE

WHITE

WHITE

WHITE

A-33X

4

3

1

2

22

1

2

3

4

34

4

B-14

MU802605

B-10

A-13

OFF

ON

36

FUSIBLE LINK

RELAY BOX
(ENGINE COMPARTMENT)

TO ECM

TO ECM TO ECM

ENGINE
CONTROL
MODULE

LEFT BANK HEATED OXYGEN SENSOR (FRONT) HEATER CIRCUIT

LEFT BANK HEATED
OXYGEN SENSOR (FRONT)

MFI
RELAY

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-99

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

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

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

the left bank heated oxygen sensor (front) 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

Left bank heated oxygen sensor heater (front) cur-

rent 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

AK700404

Left bank heated oxygen
sensor (front)

Connector: B-14

AB

B-14 (B)

AK700401AB

ECM

B-10 (GR)

Connector: B-10

AK900602

Connector: A-13

A-13

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-100

DTC SET CONDITION

Logic Flow Chart

.

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the left bank heated oxygen sensor (front) 

heater is on.

• Battery positive voltage is at between 11 and 16.5 

volts.

Judgement Criterion

• The left bank heated oxygen sensor (front) heater 

current has continued to be higher than 10.5 
ampere for 2 seconds.

.

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: )

• Left bank heated oxygen sensor (front) heater 

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