Mitsubishi Outlander (2013+). Manual - part 290

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-41

STEP 4. Check harness between air flow sensor 
connector terminal and engine-ECU connector 
terminal AFS5, ATS.

• Check power line for open circuit.

Q: Is the check result normal? 

YES : 

Go to Step 5.

NO : 

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

STEP 5. M.U.T.-III data list

• Item 5: Intake air temperature sensor

OK: At ambient temperature (atmospheric 
temperature) or equivalent.

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. 

STEP 6. Perform resistance measurement at air 
flow sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal engine-ECU AFSE 

line and body earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Check harness between air flow sensor 
connector terminal and engine-ECU connector 
terminal AFSE.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

STEP 8. Check harness between air flow sensor 
connector terminal and engine-ECU connector 
terminal AFS5, ATS.

• Check power line for damage.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

Code No. P0117: Engine Coolant Temperature Sensor Circuit Low Input

OPERATION

• A power voltage of 5 V is applied to the engine 

coolant temperature sensor power terminal from 
the engine-ECU connector terminal WTS.

• The power voltage is earthed to the engine-ECU 

connector terminal WTSE from the engine cool-
ant temperature sensor connector terminal.

FUNCTION

• The engine coolant temperature sensor converts 

the engine coolant temperature into a voltage sig-
nal, and inputs the voltage to the engine-ECU.

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

trols the fuel injection amount and the fast idle 
speed when the engine is cold state.

• The engine coolant temperature sensor is a kind 

of resistor, which has characteristics to reduce its 
resistance as the engine coolant temperature 
rises. Therefore, the sensor output voltage varies 
with the engine coolant temperature, and 
becomes lower as the engine coolant tempera-
ture rises.

TROUBLE JUDGMENT

Check Condition

• More than 2 seconds have passed since the 

engine starting sequence was completed.

Judgement Criterion

• Engine coolant temperature sensor output volt-

age is less than 0.1 V (corresponding to an 
engine coolant temperature of 140

°C or more) for 

2 seconds.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-42

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the engine coolant temperature is 

80

°C.

PROBABLE CAUSES

• Failed engine coolant temperature sensor

• Short circuit in engine coolant temperature sen-

sor circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 6: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature 

(atmospheric temperature) or equivalent.

Engine hot state: At 80 

− 120°C

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 resistance measurement at 
engine coolant temperature sensor connector.

• Disconnect connector, and measure at sensor 

side.

• Resistance between terminals.

OK:

Engine coolant temperature at 

−20°C: 14 − 17 

k

Ω

Engine coolant temperature at 0

°C: 5.1 − 6.5 

k

Ω

Engine coolant temperature at 20

°C: 2.1 − 2.7 

k

Ω

Engine coolant temperature at 40

°C: 0.9 − 1.3 

k

Ω

Engine coolant temperature at 60

°C: 0.48 − 

0.68 k

Ω

Engine coolant temperature at 80

°C: 0.26 − 

0.36 k

Ω

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or replace 
the engine coolant temperature sensor.

STEP 3. Perform voltage measurement at engine 
coolant temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU WTS line 

and body earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check harness between engine coolant 
temperature sensor connector terminal and 
engine-ECU connector terminal WTS.

• Check power line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

STEP 5. M.U.T.-III data list

• Item 6: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature 

(atmospheric temperature) or equivalent.

Engine hot state: At 80 

− 120 °C

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. P0118: Engine Coolant Temperature Sensor Circuit High Input

OPERATION

• A power voltage of 5 V is applied to the engine 

coolant temperature sensor power terminal from 
the engine-ECU connector terminal WTS.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-43

• The power voltage is earthed to the engine-ECU 

connector terminal WTSE from the engine cool-
ant temperature sensor connector terminal.

FUNCTION

• The engine coolant temperature sensor converts 

the engine coolant temperature into a voltage sig-
nal, and inputs the voltage to the engine-ECU.

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

trols the fuel injection amount and the fast idle 
speed when the engine is cold state.

• The engine coolant temperature sensor is a kind 

of resistor, which has characteristics to reduce its 
resistance as the engine coolant temperature 
rises. Therefore, the sensor output voltage varies 
with the engine coolant temperature, and 
becomes lower as the engine coolant tempera-
ture rises.

TROUBLE JUDGMENT

Check Condition

• More than 2 seconds have passed since the 

engine starting sequence was completed.

Judgement Criterion

• Engine coolant temperature sensor output volt-

age is more than 4.6 V (corresponding to an 
engine coolant temperature of 

−45°C or less) for 

2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the engine coolant temperature is 

80

°C.

PROBABLE CAUSES

• Failed engine coolant temperature sensor

• Open circuit or harness damage in engine cool-

ant temperature sensor circuit or loose connector 
contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 6: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature 

(atmospheric temperature) or equivalent.

Engine hot state: At 80 

− 120°C

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 resistance measurement at 
engine coolant temperature sensor connector.

• Disconnect connector, and measure at sensor 

side.

• Resistance between terminals.

OK:

Engine coolant temperature at 

−20°C: 14 − 17 

k

Ω

Engine coolant temperature at 0

°C: 5.1 − 6.5 

k

Ω

Engine coolant temperature at 20

°C: 2.1 − 2.7 

k

Ω

Engine coolant temperature at 40

°C: 0.9 − 1.3 

k

Ω

Engine coolant temperature at 60

°C: 0.48 − 

0.68 k

Ω

Engine coolant temperature at 80

°C: 0.26 − 

0.36 k

Ω

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or replace 
the engine coolant temperature sensor.

STEP 3. Perform voltage measurement at engine 
coolant temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU WTS line 

and body earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 4.

STEP 4. Check harness between engine coolant 
temperature sensor connector terminal and 
engine-ECU connector terminal WTS.

• Check output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-44

STEP 5. M.U.T.-III data list

• Item 6: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature 

(atmospheric temperature) or equivalent.

Engine hot state: At 80 

− 120 °C

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. 

STEP 6. Perform resistance measurement at 
engine coolant temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal engine-ECU WTSE 

line and body earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Check harness between engine coolant 
temperature sensor connector terminal and 
engine-ECU connector terminal WTSE.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

STEP 8. Check harness between engine coolant 
temperature sensor connector terminal and 
engine-ECU connector terminal WTS.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

Code No. P0121: Trustful Check Throttle Position Sensor (main)

FUNCTION

• Compare the actual measurement of volumetric 

efficiency by an air flow sensor signal with volu-
metric efficiency estimated from a throttle position 
sensor (main) signal.

TROUBLE JUDGMENT

Check Conditions

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (main) is more than 0 
%. Or, the volumetric efficiency is less than 60 %.

• Engine speed is more than 750 r/min and is less 

than 3,000r/min. Or, the throttle position sensor 
(main) output voltage is less than 3 V.

Judgement Criterion

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (main) is more than 33 
%.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree is restricted.

• Throttle opening degree position is in default 

position if throttle position sensor (sub) fails.

PROBABLE CAUSES

• Failed throttle position sensor (main)

• Harness damage in throttle position sensor 

(main) circuit or loose connector contact

• Failed intake air system

• There is some foreign matter around air flow sen-

sor

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is any other diagnosis code than P0121 set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-23

).

NO : 

Go to Step 2.

STEP 2. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item 13: Throttle position sensor (main)

Q: Is the check result normal?