Mitsubishi L200. Manual — part 129

TROUBLESHOOTING

DIESEL FUEL

13A-312

Code No. P1428: No. 3 Exhaust Gas Temperature Sensor (DPF temperature) Circuit High Input
<Euro5>

OPERATION

• A power voltage of 5 V is applied to the No. 3

exhaust gas temperature sensor (DPF tempera-
ture) output terminal (terminal No. 2) from the
engine-ECU (terminal No. 60).

• The power voltage is earthed to the engine-ECU

(terminal No. 84) from the No. 3 exhaust gas tem-
perature sensor (DPF temperature) (terminal No.
1).

FUNCTION

• The No. 3 exhaust gas temperature sensor (DPF

temperature) converts the DPF 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. 3 exhaust gas temperature sensor (DPF

temperature) is a kind of resistor, which has char-
acteristics to reduce its resistance as the DPF
temperature rises. Therefore, the sensor output
voltage varies with the DPF temperature, and
becomes lower as the DPF 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. 3 exhaust gas temperature sensor (DPF

temperature) output voltage is 4.95 V or more.

PROBABLE CAUSES

• Failed No. 3 exhaust gas temperature sensor

(DPF temperature)

AKB00277

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1 2

AB

B

W

W-V

BR-G

Engine-ECU

No. 3 exhaust gas
temperature sensor
(DPF temperature)

A-158

MU802661

No. 3 Exhaust Gas Temperature Sensor (DPF temperature) Circuit

1

6

84

2

A-28

12

60

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-313

• Open circuit or harness damage in No. 3 exhaust

gas temperature sensor (DPF temperature) cir-
cuit 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 119: No. 3 exhaust gas temperature sensor

(DPF temperature)

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-158 No. 3 exhaust
gas temperature sensor (DPF temperature)
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Check No. 3 exhaust gas temperature
sensor (DPF temperature) itself.

• Check No. 3 exhaust gas temperature sensor

(DPF temperature) itself (Refer to GROUP 17

−

Emission Control

− Diesel Particulate Filter (DPF)

System

− No. 3 exhaust gas temperature sensor

(DPF temperature) Check ).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace the No. 3 exhaust gas temperature
sensor (DPF temperature). After replacing
the No. 3 exhaust gas temperature sensor
(DPF temperature), 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-158
No. 3 exhaust gas temperature sensor (DPF
temperature) connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 2 and earth.

OK: 4.5

− 4.9 V

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Go to Step 5 .

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

TROUBLESHOOTING

DIESEL FUEL

13A-314

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.

STEP 6. Check harness between A-158 (terminal
No. 2) No. 3 exhaust gas temperature sensor
(DPF temperature) connector and C-105 (terminal
No. 60) engine-ECU connector.

NOTE: Before checking harness, check intermediate
connector A-28, and repair if necessary.

• Check output line for open circuit.

Q: Is the check result normal?

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

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

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-315

YES :

Go to Step 7 .

NO :

Repair the damaged harness wire.

STEP 7. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-542

a. Item 119: No. 3 exhaust gas temperature sensor

(DPF temperature)

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-
158 No. 3 exhaust gas temperature sensor (DPF
temperature) 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 .

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)