Mitsubishi L200. Manual - part 116

TROUBLESHOOTING

DIESEL FUEL

13A-260

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 117: No.1 exhaust gas temperature sensor

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-149 No.1 exhaust 
gas temperature sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check No.1 exhaust gas temperature 
sensor itself.

• Check No.1 exhaust gas temperature sensor 

itself (Refer to GROUP 17 

− Emission Control − 

Diesel Particulate Filter (DPF) System 

− No.1 

exhaust gas temperature sensor Check ).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the No.1 exhaust gas temperature 
sensor. After replacing the No.1 exhaust 
gas temperature sensor, carry out the 
forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ). 

STEP 4. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair or replace the connector.

AKB00276

1

2

Harness side
connector

AB

A-149 (B)

Connector: A-149

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-261

STEP 5. Check harness between A-149 (terminal 
No. 1) No. 1 exhaust gas temperature sensor 
connector and C-105 (terminal No. 58) engine-
ECU connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

a. Item 117: No.1 exhaust gas temperature sensor

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 ).

AKB00276

1

2

Harness side
connector

AB

A-149 (B)

Connector: A-149

AKA00089

1

2

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96

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-262

Code No. P0546: No. 1 exhaust gas temperature sensor Circuit High Input <Euro5>

OPERATION

• A power voltage of 5 V is applied to the No. 1 

exhaust gas temperature sensor output terminal 
(terminal No. 1) from the engine-ECU (terminal 
No. 58).

• The power voltage is earthed to the engine-ECU 

(terminal No. 82) from the No. 1 exhaust gas tem-
perature sensor (terminal No. 2).

FUNCTION

• The No. 1 exhaust gas temperature sensor con-

verts the exhaust gas temperature into a voltage 
and inputs the voltage signal to the engine-ECU.

• Engine-ECU uses this voltage for DPF regenera-

tion control.

• The No. 1 exhaust gas temperature sensor is a 

kind of resistor, which has characteristics to 
reduce its resistance as the exhaust gas temper-
ature rises. Therefore, the sensor output voltage 
varies with the exhaust gas temperature, and 
becomes lower as the exhaust gas 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.

• Vehicle speed is 20 km/h or higher.

Judgment Criterion

• The No. 1 exhaust gas temperature sensor out-

put voltage is 4.95 V or more.

PROBABLE CAUSES

• Failed No. 1 exhaust gas temperature sensor

AKB00275

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1 2

AB

O-G

BR-L

Engine-ECU

No. 1 exhaust gas
temperature sensor

A-149

MU802601

No. 1 Exhaust Gas Temperature Sensor Circuit

2

82

1

58

5 V

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

TROUBLESHOOTING

DIESEL FUEL

13A-263

• Open circuit or harness damage in No. 1 exhaust 

gas temperature sensor circuit or loose connector 
contact

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

a. Item 117: No. 1 exhaust gas temperature sensor

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-149 No. 1 exhaust 
gas temperature sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check No. 1 exhaust gas temperature 
sensor itself.

• Check No. 1 exhaust gas temperature sensor 

itself (Refer to GROUP 17 

− Emission Control − 

Diesel Particulate Filter (DPF) System 

− No. 1 

exhaust gas temperature sensor Check ).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the No. 1 exhaust gas temperature 
sensor. After replacing the No. 1 exhaust 
gas temperature sensor, carry out the 
forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

STEP 4. Perform voltage measurement at A-149 
No. 1 exhaust gas 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.

AKB00276

1

2

Harness side
connector

AB

A-149 (B)

Connector: A-149

AKB00276

1

2

Harness side
connector

AB

A-149 (B)

Connector: A-149

AKA00089

1

2

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96

C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB