Mitsubishi Outlander GS45X. Manual - part 607

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-251

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Heated oxygen sensor offset voltage is between 

0.4 and 0.6 volt.

• 2 seconds or more have passed since the engine 

starting sequence was completed.

Judgement Criterion

• Heated oxygen sensor (rear) output voltage has 

continued to be 1.8 volts or higher for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 23 

P.13A-11

.

.

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

• Shorted heated oxygen sensor (rear) circuit, or 

connector damage.

• ECM failed.

End

Malfunction

No

No

No

2secs have passed?

Output voltage

> 1.8V

Good

AK604322

Start

Yes

Yes

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-252

DIAGNOSIS

STEP 1. Check harness connector D-37 at heated oxygen 
sensor (rear) and harness connector B-10 at ECM 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 3.

STEP 2. Check for short circuit to power supply between 
heated oxygen sensor (rear) connector D-37 (terminal No. 
3) and ECM connector B-10 (terminal No. 40).
NOTE: Check harness after checking intermediate connector 
A-13 and C-129. If intermediate connector is damaged, repair 
or replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion 

P.00E-2

. Then go to Step 3.

Q: Is the harness wire in good condition?

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 :  Repair it. Then go to Step 3.

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 23 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0138 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-253

DTC P0139: Heated Oxygen Sensor (rear) Circuit Slow Responce

AK900383

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

2

8

7

6

5

4

3

11

21

20

19

18

17

16

15

14

13

12

9

22

1

10

AD

D-37

FROM MFI RELAY

TO ECM

1

4

2

3

HEATED OXYGEN SENSOR (REAR) CIRCUIT

HEATED OXYGEN
SENSOR (REAR)

B-10

YELLO

W

ORANGE

ORANGE

YELLO

W

ENGINE
CONTROL
MODULE

0.5 V

C-129

18

41

40

17

17

ORANGE

YELLO

W

15

A-13

AK704087AB

Connector: A-13

A-13

AK704090AB

Connector: B-10

B-10 (GR)

AK900595

Connector: C-129

C-129

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-254

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 40) from the output terminal (terminal 
No. 3) of the heated oxygen sensor (rear).

• Terminal No. 4 of the heated oxygen sensor 

(rear) is grounded with ECM (terminal No. 41).

• The ECM applies an offset voltage of 0.5 volt to 

terminal No. 4 of the heated oxygen sensor (rear)

.

TECHNICAL DESCRIPTION

• The output signal of the linear air-fuel ratio sensor 

is compensated by the output signal of the 
heated oxygen sensor (rear).

• The ECM checks for the heated oxygen sensor 

(rear) output voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Heated oxygen sensor (rear) output voltage does not 

reach 0.2 volt after fuel cut operation.

.

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)

• Linear air-fuel ratio sensor monitor

• Linear air-fuel ratio sensor heater monitor

• Heated oxygen sensor (rear) heater monitor

• Heated oxygen sensor offset voltage monitor

Sensor (The sensor below is determined to be 

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

.

AK900665

D-37 (B)

Rear heater duct (RH)

Heated oxygen 
sensor (rear) 

AB

Connector: D-37