Mitsubishi L200. Manual - part 85

TROUBLESHOOTING

DIESEL FUEL

13A-136

STEP 9. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair or replace the connector.

STEP 10. Check harness between A-46 (terminal 
No. 2) fuel temperature sensor connector and C-
105 (terminal No. 79) engine-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AK501326

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2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

TROUBLESHOOTING

DIESEL FUEL

13A-137

STEP 11. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair or replace the connector.

STEP 12. Check harness between A-46 (terminal 
No. 1) fuel temperature sensor connector and C-
105 (terminal No. 55) engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AK501326

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2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

TROUBLESHOOTING

DIESEL FUEL

13A-138

Code No. P0183: Fuel Temperature Sensor Circuit High Input

OPERATION

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

perature sensor output terminal (terminal No. 1) 
of the air flow sensor connector from the engine-
ECU (terminal No. 55).

• The power voltage is earthed to the engine-ECU 

(terminal No. 79) from the fuel temperature sen-
sor (terminal No. 2).

FUNCTION

• The fuel temperature sensor converts the intake 

air temperature into a voltage and inputs the volt-
age signal to the engine-ECU.

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

rects the fuel injection amount, etc.

• The fuel temperature sensor is a kind of resistor, 

which has characteristics to reduce its resistance 
as the intake air temperature rises. Therefore, the 
sensor output voltage varies with the fuel temper-
ature, and becomes lower as the fuel tempera-
ture rises.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been 

in "ON" position or the engine has started up.

Judgment Criterion

• The fuel temperature sensor output voltage is 

4.95 V or more for 0.5 second.

PROBABLE CAUSES

• Failed fuel temperature sensor

• Open circuit or harness damage in fuel tempera-

ture sensor circuit or loose connector contact

• Failed engine-ECU

AKA00097

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AB

79

55

Fuel temperature sensor

Engine-ECU 

2

1

Fuel Temperature Sensor Circuit

BR

Y-B

A-46

(MU802406)

C-105

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Grey
R: Red  P: Pink  V: Violet  PU: Purple

  SI: Silver

5 V

TROUBLESHOOTING

DIESEL FUEL

13A-139

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 21: Fuel temperature sensor

OK: At ambient temperature (fuel tempera-
ture) 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 : 

Go to Step 2 .

STEP 2. Connector check: A-46 fuel temperature 
sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check fuel temperature sensor itself.

• Check fuel temperature sensor itself (Refer to 

P.13A-596

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the fuel temperature sensor.

STEP 4. Perform voltage measurement at A-46 
fuel temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 5 .

STEP 5. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB