Mitsubishi Outlander GS45X. Manual - part 943

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-705

.

HEATED OXYGEN SENSOR OFFSET 
CIRCUIT LOW VOLTAGE CIRCUIT

Refer to DTC P0131 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 1, sensor 1) 

P.13B-222

.

Refer to DTC P0137 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 1, sensor 2) 

P.13B-244

.

Refer to DTC P0151 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 2, sensor 1) 

P.13B-263

.

Refer to DTC P0157 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 2, sensor 2) 

P.13B-284

.

.

CIRCUIT OPERATION

Refer to DTC P0131 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 1, sensor 1) 

P.13B-222

.

Refer to DTC P0137 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 1, sensor 2) 

P.13B-244

.

Refer to DTC P0151 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 2, sensor 1) 

P.13B-263

.

Refer to DTC P0157 

− Heated Oxygen Sensor Cir-

cuit Low Voltage (bank 2, sensor 2) 

P.13B-284

.

.

TECHNICAL DESCRIPTION

• The ECM applies an offset voltage of 0.5 volt to 

the heated oxygen sensor.

• The ECM checks for heated oxygen sensor offset 

voltage.

.

DESCRIPTIONS OF MONITOR METHODS

Heated oxygen sensor offset voltage is under speci-

fied 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

AK700401AB

ECM

B-10 (GR)

Connector: B-10

AK700405AB

Left bank heated
oxygen sensor (rear)

Front
exhaust pipe

B-13 (GR)

Connector: B-13

AK700404

Left bank heated oxygen
sensor (front)

Connector: B-14

AB

B-14 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-706

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITION

Logic Flow Chart

Check Condition

• 2 seconds or more have passed since the engine 

starting sequence was completed.

Judgement Criterion

• Heated oxygen sensor offset voltage is lower 

than 0.4 volt for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnosis Function 

− OBD-II Drive Cycle − 

Pattern 22 

P.13B-11

.

.

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

• Right bank heated oxygen sensor (front) failed.

• Right bank heated oxygen sensor (rear) failed.

• Left bank heated oxygen sensor (front) failed.

• Left bank heated oxygen sensor (rear) failed.

• Shorted right bank heated oxygen sensor (front) 

circuit or connector damage.

• Shorted right bank heated oxygen sensor (rear) 

circuit or connector damage.

• Shorted left bank heated oxygen sensor (front) 

circuit or connector damage.

• Shorted left bank heated oxygen sensor (rear) 

circuit or connector damage.

• ECM failed.

AK604367

Good

Malfunction

End

No

No

No

2secs have passed?

Heated oxygen

sensor offset voltage

< 0.4V or >0.6V?

Start

Yes

Yes

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-707

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991316: Test Harness

• MD998464: Test Harness

STEP 1. Check harness connector B-03 at right bank 
heated oxygen sensor (front), harness connector B-02 at 
right bank heated oxygen sensor (rear), harness connector 
B-14 at left bank heated oxygen sensor (front), harness 
connector B-13 at left bank heated oxygen sensor (rear) 
and harness connector B-10 at ECM for damage.
Q: Are the harness connectors in good condition?

YES : Go to Step 2.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. Then go to 

Step 11.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-708

STEP 2. Check the right bank heated oxygen sensor 
(front). 
(1) Disconnect the 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 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 2,000 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 right 

bank heated oxygen sensor (front) output voltage.

 Standard value: 0.6 

− 1.0 V

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 heated 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 positive terminal and the negative terminal of 8 volts 
power supply respectively, then check again.

Q: Is the measured voltage between 0.6 and 1.0 volt?

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

Then go to Step 11.

AK700102

MB991316

White

Black

AB

Heated oxygen
sensor component
side connector