Mitsubishi Outlander (2013+). Manual - part 293

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-53

TROUBLE JUDGMENT

Check Conditions

• Typically 20 seconds have passed since the 

engine starting sequence was completed.

• Engine coolant temperature is more than 76°C. 

<4B11>

• Engine coolant temperature is more than 60°C. 

<4B12>

• Engine speed is more than 1,188 r/min.

• Volumetric efficiency is more than 30 %.

• Except while fuel is being shut off.

• Monitoring time: 30 seconds.

Judgement Criterion

• Oxygen sensor (front) output voltage does not 

get across lean/rich criteria (about 0.5 V) within 
about 30 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (front)

• Harness damage in oxygen sensor (front) circuit

• Failed injector

• Harness damage in injector circuit

• Exhaust leak

• Air drawn in from gaps in gasket, seal, etc.

• Incorrect fuel pressure

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item AC: Oxygen sensor (front)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Go to Step 2.

STEP 2. Check for exhaust leaks.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair.

STEP 3. Check for intake system vacuum leak.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair.

STEP 4. Check oxygen sensor (front) itself.

• Oxygen sensor (front) connector check.

• Oxygen sensor (front) check (Refer to 

P.13A-186

).

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair or replace the connector, or replace 
the oxygen sensor (front).

STEP 5. Check injector itself.

• No.1, No.2, No.3, No.4 injector connector check.

• Injector check (Refer to 

P.13A-188

).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the connector, or replace 
the injector.

STEP 6. Check harness between oxygen sensor 
(front) connector terminal and engine-ECU 
connector terminal O2FL.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 7. 

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 7. Check harness between injector 
connector and engine-ECU connector.

a. Check and repair harness between No. 1 injector 

connector terminal and engine-ECU connector 
terminal INJ1.

b. Check and repair harness between No. 2 injector 

connector terminal and engine-ECU connector 
terminal INJ2.

c. Check and repair harness between No. 3 injector 

connector terminal and engine-ECU connector 
terminal INJ3.

d. Check and repair harness between No. 4 injector 

connector terminal and engine-ECU connector 
terminal INJ4.

• Check output line for damage.

Q: Are the check result normal?

YES : 

Go to Step 8.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-54

STEP 8. Fuel pressure measurement.

• Fuel pressure test (Refer to 

P.13A-179

).

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Repair.

Code No. P0137: Oxygen Sensor (rear) Circuit Low Voltage

OPERATION

• The sensor signal is inputted to the engine-ECU 

connector terminal O2RL from the oxygen sensor 
(rear) output terminal.

• The oxygen sensor (rear) connector terminal is 

earthed with engine-ECU connector terminal 
ORLE.

FUNCTION

• The oxygen sensor (rear) converts the concentra-

tion of oxygen in the exhaust emission into a volt-
age and inputs the signal to the engine-ECU.

• When the air-fuel ratio is richer than the theoreti-

cal air-fuel ratio, the oxygen sensor (rear) outputs 
a voltage of about 1 V. When it is leaner than the 
theoretical air-fuel ratio, it outputs a voltage of 
about 0 V.

• In response to the signal, the engine-ECU con-

trols the fuel injection amount so that the air-fuel 
ratio can be equivalent to the theoretical air-fuel 
ratio.

TROUBLE JUDGMENT

Check Conditions

• Oxygen sensor (rear) offset voltage is more than 

0.4 V and is less than 0.6 V.

• Battery positive voltage is more than 11 V and is 

less than 16.5 V.

• More than 5 minutes have passed since the 

engine starting sequence was completed.

Judgement Criterion

• Oxygen sensor (rear) output voltage is less than 

0.2 V for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (rear)

• Open/short circuit or harness damage in oxygen 

sensor (rear) circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item AD: Oxygen sensor (rear)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Go to Step 2.

STEP 2. Perform voltage measurement at oxygen 
sensor (rear) connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU ORLE line 

and body earth.

OK: 0.4 

− 0.6 V

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

STEP 3. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal ORLE.

• Check earthing line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 4. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item AD: Oxygen sensor (rear)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Replace the engine-ECU.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-55

STEP 5. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal ORLE.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 6. Perform voltage measurement at oxygen 
sensor (rear) connector.

• Use special tool test harness (MB991658) to con-

nect connector, and measure at pick-up harness.

• Transmission: 2nd speed

• Drive with wide open throttle

• Engine: 3,500 r/min or more

• Voltage between terminal engine-ECU O2RL line 

and body earth.

OK:

The output voltage should be 1.1 

− 1.5 V.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Check oxygen sensor (rear) itself. 

• Oxygen sensor check (Refer to 

P.13A-186

).

Q: Is the check result normal?

YES : 

Repair or replace the connector, or check 

intermediate connectors, and repair if 
necessary. If intermediate connectors are 
normal, check and repair harness between 
oxygen sensor (rear) connector terminal 
and engine-ECU connector terminal O2RL.

• Check output line for short circuit.

NO : 

Replace oxygen sensor (rear).

STEP 8. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal O2RL.

• Check output line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the damaged harness wire.

Code No. P0138: Oxygen Sensor (rear) Circuit High Voltage 

OPERATION

• The sensor signal is inputted to the engine-ECU 

connector terminal O2RL from the oxygen sensor 
(rear) output terminal.

• The oxygen sensor (rear) connector terminal is 

earthed with engine-ECU connector terminal 
ORLE.

FUNCTION

• The oxygen sensor (rear) converts the concentra-

tion of oxygen in the exhaust emission into a volt-
age and inputs the signal to the engine-ECU.

• When the air-fuel ratio is richer than the theoreti-

cal air-fuel ratio, the oxygen sensor (rear) outputs 
a voltage of about 1 V. When it is leaner than the 
theoretical air-fuel ratio, it outputs a voltage of 
about 0 V.

• In response to the signal, the engine-ECU con-

trols the fuel injection amount so that the air-fuel 
ratio can be equivalent to the theoretical air-fuel 
ratio.

TROUBLE JUDGMENT

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• Oxygen sensor (rear) offset voltage is more than 

0.4 V and is less than 3.8 V.

Judgement Criterion

• Oxygen sensor (rear) output voltage is more than 

1.2 V for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (rear)

• Short circuit in oxygen sensor (rear) circuit or 

loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item AD: Oxygen sensor (rear)

Q: Are the check results normal?

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-56

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Go to Step 2.

STEP 2. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal O2RL.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 3. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal ORLE.

• Check earthing line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 4. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item AD: Oxygen sensor (rear)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Replace the engine-ECU.

Code No. P0171: Abnormal Fuel System (lean)

OPERATION

• Check code No. P0261: No. 1 injector circuit low 

input (Refer to 

P.13A-62

).

• Check code No. P0262: No. 1 injector circuit high 

input (Refer to 

P.13A-63

).

• Check code No. P0264: No. 2 injector circuit low 

input (Refer to 

P.13A-64

).

• Check code No. P0265: No. 2 injector circuit high 

input (Refer to 

P.13A-65

).

• Check code No. P0267: No. 3 injector circuit low 

input (Refer to 

P.13A-66

).

• Check code No. P0268: No. 3 injector circuit high 

input (Refer to 

P.13A-67

).

• Check code No. P0270: No. 4 injector circuit low 

input (Refer to 

P.13A-68

).

• Check code No. P0271: No. 4 injector circuit high 

input (Refer to 

P.13A-69

).

FUNCTION

• If the fuel system goes out of order, the fuel cor-

rection value will become larger.

• The engine-ECU checks whether the fuel trim 

value is within a specified range.

TROUBLE JUDGMENT

Check Conditions

• Engine coolant temperature is less than 100°C 

when the engine is started.

• Intake air temperature is less than 60°C when the 

engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is more than 76°C.

• Air flow sensor output is more than 6.4 g/sec.

Judgement Criterion

• Long-term fuel trim is more than +12.5 % for 5 

seconds.

or

• Short-term fuel trim is more than +7.0 % for 5 

seconds. <4B11>

• Short-term fuel trim is more than +10.0 % for 5 

seconds. <4B12>

Check Conditions

• Engine coolant temperature is more than 100°C 

when the engine is started.

• Intake air temperature is more than 60°C when 

the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is more than 76°C.

• Air flow sensor output is more than 6.4 g/sec. 

Judgement Criterion

• Long-term fuel trim is more than +12.5 % for 5 

seconds.

or

• Short-term fuel trim is more than +17.2 % for 5 

seconds. <4B11>