Mitsubishi Outlander GS45X. Manual - part 833

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-265

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Heated oxygen sensor offset voltage is between 

0.4 and 0.6 volt.

• Battery positive voltage is between 11 and 16.5 

volts.

• More than 180 seconds have passed since the 

engine starting sequence was completed.

Judgement Criterion

• Left bank heated oxygen sensor (front) output 

voltage is lower than 0.2 volt for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 21 

P.13B-11

.

.

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

• Left bank heated oxygen sensor (front) failed.

• Connector damage.

• Harness damage.

• ECM failed.

End

Malfunction

Yes

Yes

Yes

No

No

No

2secs have passed?

Output voltage

< 0.2V

Monitoring
conditions

Good

Start

AK700471

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-266

DIAGNOSIS

STEP 1. Check harness connector B-14 at the left bank 
heated oxygen sensor (front) and harness connector B-10 
at the 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 5.

STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front) 

connector B-14 and connect test harness special tool, 
MB998464, to the connector on the left bank heated oxygen 
sensor (front) side.

(2) Warm up the engine until engine coolant temperature 

reaches 80

°C (176°F) or higher.

(3) Rev the engine for 5 minutes or more with the engine speed 

of 2,500 r/min.

(4) Connect a digital voltage meter between terminal No. 2 

(black clip) and terminal No. 4 (white clip).

(5) While repeatedly revving the engine, measure the left bank 

heated oxygen sensor (front) output voltage.

Standard value: 0.6 

− 1.0 volts

CAUTION

• Be very careful when connecting the jumper wires; 

incorrect connection can damage the heated oxygen 
sensor.

• Be careful the heater can be damaged if a voltage 

beyond 8 volts is applied to the heated oxygen sensor 
heater.
NOTE: If the temperature of sensing area does not reach 
the high temperature [of approximately 400

°

C (752

°

F) or 

more] even though the oxygen sensor is normal, the output 
voltage would be possibly low in spite of the rich air-fuel 
ratio. Therefore, if the output voltage is low, use a jumper 
wire to connect the terminal No.1 (red clip) and the terminal 
No. 3 (blue clip) of the heated oxygen sensor with the posi-
tive terminal and the negative terminal of 8 volts power sup-
ply respectively, then check again.

Q: Is the voltage between 0.6 and 1.0 volts?

YES : Go to Step 3.
NO :  Replace the left bank heated oxygen sensor (front). 

Then go to Step 5.

AK700554AB

Heated
oxygen
sensor
component
side
connector

MD998464

Black

White

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-267

STEP 3. Check for harness between the left heated oxygen 
sensor (front) connector B-14 and the ECM connector 
B-10.
(1) Disconnect the left bank heated oxygen sensor (front) 

connector B-14 and the ECM connector B-10.

(2) Measure the resistance between the heated oxygen sensor 

connector B-14 and the ECM connector B-10.

a. Connector B-14 (terminal No. 2) and connector B-10 

(terminal No. 39).

b. Connector B-14 (terminal No. 4) and connector B-10 

(terminal No. 38).

• Should be less than 2 ohms.

(3) Check for the continuity between the oxygen sensor 

connector B-14 and ground.

a. Connector B-14 (terminal No. 2) and ground
b. Connector B-14 (terminal No. 4) and ground

• Not continuity.

Q: Is the harness wire in good condition?

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

Inspection 

P.00E-2

. Then go to Step 5.

AK700287

1

2

3

4

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

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

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

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

AB

B-14 harness
connector:
component side

B-10 harness
connector:
component side

1

2

3

4

AK700288 AB

B-14 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-268

STEP 4. Using scan tool MB991958, check data list item 
AE: Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

AE, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

• Warm up the engine. When the engine is revved, the 

output voltage should battery positive voltage.

• Warm up the engine. When the engine is idling, the out-

put voltage should repeat 0.4 volt or less and 0.6 to 1.0 
volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : 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

.

NO :  Replace the ECM. Then go to Step 5.

STEP 5. 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 21 

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0151 set?

YES : Retry the troubleshooting.
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

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector