Mitsubishi Outlander GS45X. Manual - part 568

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-95

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 higher than average 10 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:)

• Shorted linear air-fuel ratio sensor heater circuit 

or connector damage.

• Linear air-fuel ratio sensor 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-96

DIAGNOSIS

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 8.

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 8.

STEP 3. Check harness connector A-33X at MFI relay for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 8.

STEP 4. Check for short circuit to power supply between 
MFI relay connector A-33X (terminal No. 2) and linear 
air-fuel ratio sensor connector C-142 (terminal No. 3).
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it. Then go to Step 8.

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 8.

AK900847

3

2

1

6

5

4

Linear air-fuel 
ratio sensor 
connector

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-97

STEP 6. Check for short circuit to power supply between 
linear air-fuel ratio sensor connector C-142 (terminal No. 2) 
and ECM connector B-10 (terminal No. 34).
NOTE: Check harness after checking intermediate connector 
A-13. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 8.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 8.

STEP 7. 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 P0032 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 8.

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 8. 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 P0032 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-98

DTC P0037: Heated Oxygen Sensor (rear) Heater Control Circuit Low

AK704091

1

3

2

4

2

8

7

6

5

4

3

11

21

20

19

18

17

16

15

14

13

12

9

22

1

10

1 2

3 4

1

10 111213 14 1516 17 1819 20

2 3 4

5 6 7 8 9

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

WHITE

WHITE

HEATED OXYGEN SENSOR (REAR) HEATER CIRCUIT 

36

FUSIBLE LINK

AE

D-37

19

20A

WHITE

A-33X

4

3

1

2

22

C-129

B-10

OFF

ON

1

4

2

3

WHITE

16

1

A-13

35

HEATED OXYGEN SENSOR
(REAR)

RELAY BOX
(ENGINE COMPARTMENT)

ENGINE
CONTROL
MODULE

TO ECM

TO ECM

TO ECM

MFI
RELAY

BR

O

W

N

BR

O

W

N

BR

O

W

N