Mitsubishi Outlander (2013+). Manual - part 291

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-45

YES : 

Go to Step 3.

NO : 

Check throttle position sensor (main) 
system. Check code No. P0122: throttle 
position sensor (main) circuit low input 
(Refer to 

P.13A-45

). Check code No. 

P0123: throttle position sensor (main) circuit 
high input (Refer to 

P.13A-46

).

STEP 3. Check air intake from inlet hose and inlet 
manifold.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair.

STEP 4. Check air flow sensor.

• Check that there is not foreign matter around air 

flow sensor.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair.

STEP 5. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is diagnosis code set?

YES : 

Replace the engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

Code No. P0122: Throttle Position Sensor (main) Circuit Low Input

OPERATION

• A power voltage of 5 V is applied to the elec-

tronic-controlled throttle valve connector terminal 
from the engine-ECU connector terminal TPS5.

• The power voltage is earthed to the engine-ECU 

connector terminal TPSE from the electronic-con-
trolled throttle valve connector terminal.

• The sensor signal is inputted to the engine-ECU 

connector terminal TPSM from the elec-
tronic-controlled throttle valve output terminal.

FUNCTION

• The throttle position sensor converts the throttle 

valve position into voltage and inputs it into the 
engine-ECU.

• The engine-ECU controls the throttle valve open-

ing angle.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• Throttle position sensor (main) output voltage is 

less than 0.2 V.

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)

• Short circuit or harness damage in throttle posi-

tion sensor 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 13: Throttle position sensor (main)

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 harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPS5.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

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

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-46

STEP 3. Check harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPSM.

• Check output 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 13: Throttle position sensor (main)

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 5.

STEP 5. Replace the electronic-controlled 
throttle valve

• After replacing the electronic-controlled throttle 

valve, reconfirm whether the diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Replace the engine-ECU.

NO : 

Check end.

Code No. P0123: Throttle Position Sensor (main) Circuit High Input

OPERATION

• A power voltage of 5 V is applied to the elec-

tronic-controlled throttle valve connector terminal 
from the engine-ECU connector terminal TPS5.

• The power voltage is earthed to the engine-ECU 

connector terminal TPSE from the electronic-con-
trolled throttle valve connector terminal.

• The sensor signal is inputted to the engine-ECU 

connector terminal TPSM from the elec-
tronic-controlled throttle valve output terminal.

FUNCTION

• The throttle position sensor converts the throttle 

valve position into voltage and inputs it into the 
engine-ECU.

• The engine-ECU controls the throttle valve open-

ing angle.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• Throttle position sensor (main) output voltage is 

more than 4.8 V.

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)

• Open/short circuit or harness damage in throttle 

position sensor 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 13: Throttle position sensor (main)

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 
electronic-controlled throttle valve connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON" 

• Voltage between terminal engine-ECU TPS5 line 

and body earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-47

STEP 3. Check harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPS5.

• Check power supply line for open/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 13: Throttle position sensor (main)

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 5. Perform resistance measurement at 
electronic-controlled throttle valve connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal engine-ECU TPSE 

line and body earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Check harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPSE.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

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

STEP 7. Check harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPS5.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

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

STEP 8. Check harness between 
electronic-controlled throttle valve connector 
terminal and engine-ECU connector terminal 
TPSM.

• Check output line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

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

STEP 9. 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?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Go to Step 10.

STEP 10. Replace the electronic-controlled 
throttle valve

• After replacing the electronic-controlled throttle 

valve, reconfirm whether the diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Replace the engine-ECU.

NO : 

Check end.

Code No. P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

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.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-48

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 Conditions, Judgement Criteria

• While engine is running.

• Engine coolant temperature decreases from 

more than 40

°C to less than 40°C.

• Then the engine coolant temperature is less than 

40

°C for 5 minutes.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the engine coolant temperature is 

80

°C.

PROBABLE CAUSES

• Failed engine coolant temperature sensor

• Harness damage in engine coolant 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.

• Use special tool test harness (MB991709) to con-

nect connector, and measure at pick-up harness.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU WTS line 

and body earth.

OK:

Engine coolant temperature at 

−20°C: 3.9 − 4.5 

V

Engine coolant temperature at 0

°C: 3.2 − 3.8 V

Engine coolant temperature at 20

°C: 2.3 − 2.9 

V

Engine coolant temperature at 40

°C: 1.3 − 1.9 

V

Engine coolant temperature at 60

°C: 0.7 − 1.3 

V

Engine coolant temperature at 80

°C: 0.3 − 0.9 

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 damage.

Q: Is the check result normal?