Mitsubishi Outlander GS45X. Manual - part 785

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-73

DIAGNOSIS

Required Special Tool:

• MB991316: Test Harness

STEP 1. Check the right bank heated oxygen sensor 
(front).
(1) Disconnect right bank heated oxygen sensor (front) 

connector B-03 and connect test harness special tool, 
MB991316, to the connector on the right bank heated 
oxygen (front) sensor side.

(2) Measure the resistance between heated oxygen sensor 

connector terminal No. 1 (red clip) and terminal No. 3 (blue 
clip).

Standard value: 4.5 

− 8.0 Ω [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 right bank heated oxygen sensor (front). 

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.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0032 set?

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

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Codes 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.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0032 set?

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

AK700175

Heated
oxygent
sensor
component
side
connector

MB991316

Red

Blue

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-74

DTC P0037: Heated Oxygen Sensor Heater Circuit Low (bank 1, sensor 2)

AK700129

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

WHITE

A-33X

4

3

1

2

22

1

2

3

4

49

4

B-02

MU802605

B-10

A-13

OFF

ON

36

FUSIBLE LINK

RELAY BOX
(ENGINE COMPARTMENT)

TO ECM

TO ECM

TO ECM

4

ENGINE
CONTROL
MODULE

RIGHT BANK HEATED OXYGEN SENSOR (REAR) HEATER CIRCUIT

RIGHT BANK HEATED
OXYGEN SENSOR (REAR)

MFI
RELAY

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-75

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

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

• The ECM (terminal No. 49) controls continuity to 

the right bank heated oxygen sensor (rear) 
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

Right bank heated oxygen sensor heater (rear) cur-

rent 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

.

AK700399AB

MFI relay

A-33X

Connector: A-33X

AK900130AD

Right bank heated
oxygen sensor (rear)

Front exhaust
pipe RH

B-02 (B)

Connector: B-02

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-76

DTC SET CONDITION

Logic Flow Chart

.

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the right bank heated oxygen sensor (rear) 

heater is on.

• Battery positive voltage is at between 11 and 16.5 

volts.

Judgement Criterion

• The right bank 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 right bank heated oxygen sensor (rear) 

heater is off.

• Battery positive voltage is at between 11 and 16.5 

volts.

Judgement Criterion

• The right bank heated oxygen sensor (rear) 

heater voltage has continued to be lower than 2.0 
volts for 2 seconds.

.

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