Mitsubishi L200. Manual - part 62

TROUBLESHOOTING

DIESEL FUEL

13A-44

STEP 6. Check harness between A-135 (terminal 
No. 2) air flow sensor connector and C-105 
(terminal No. 62) engine-ECU connector.

• Check output line for short circuit.

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. M.U.T.-III data list

• Item 43: Intake air temperature sensor No. 1

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. When the engine-
ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ). After 
registering the injector identification code, 
carry out the forcible DPF regeneration. 
(Refer to GROUP 17 

− Emission Control − 

Diesel Particulate Filter (DPF) System 

− 

Forcible DPF Regeneration ).

STEP 8. Perform resistance measurement at A-
135 air flow sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 1 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 9 .

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

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

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

TROUBLESHOOTING

DIESEL FUEL

13A-45

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-135 (terminal 
No. 1) air flow sensor connector and C-105 
(terminal No. 86) 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

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

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-46

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-135 (terminal 
No. 2) air flow sensor connector and C-105 
(terminal No. 62) 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

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

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-47

Code No. P0072: Intake Air Temperature Sensor No. 2 Circuit Low Input <Except Euro5>

OPERATION

• A power voltage of 5 V is applied to the intake air 

temperature sensor No. 2 output terminal (termi-
nal No. 1) from the engine-ECU (terminal No. 38).

• The power voltage is earthed to the engine-ECU 

(terminal No. 32) from the intake air temperature 
sensor (terminal No. 2).

FUNCTION

• The intake air temperature sensor No. 2 converts 

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

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

rects the fuel injection amount, etc.

• The intake air temperature sensor No. 2 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 temperature, and becomes lower as the 
intake air temperature 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 intake air temperature sensor No. 2 output 

voltage is 0.05 V or less (the intake air tempera-
ture is above 150

°C or equivalent) for 0.5 second.

PROBABLE CAUSES

• Failed intake air temperature sensor No. 2

• Short circuit or harness damage in intake air tem-

perature sensor No. 2 circuit or loose connector 
contact

• Failed engine-ECU

AKA00091

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AB

32

38

Intake air temperature
sensor No. 2

Engine-ECU 

2

1

Intake Air Temperature Sensor No. 2 Circuit

B-P

L-R

A-136

(MU802409)

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: Gray
R: Red  P: Pink  V: Violet  PU: Purple  SI: Silver