Mitsubishi L200. Manual — part 155

TROUBLESHOOTING

DIESEL FUEL

13A-416

Code No. P2455: Exhaust Differential Pressure Sensor Circuit High Input <Euro5>

OPERATION

• A power voltage of 5 V is applied to the exhaust

differential pressure sensor power terminal (ter-
minal No. 3) from the engine-ECU (terminal No.
94) and earthed to the engine-ECU (terminal No.
80) from the exhaust differential pressure sensor
(terminal No. 2).

• The sensor signal is inputted to the engine-ECU

(terminal No. 56) from the exhaust differential
pressure sensor output terminal (terminal No. 1).

FUNCTION

• The exhaust differential pressure sensor outputs

the voltage to the engine-ECU in accordance with
the difference in the voltage between the DPF
upstream area and the DPF down stream area.

• The engine-ECU anticipates the amount of PM

accumulated in the DPF through this output volt-
age.

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 exhaust differential pressure sensor output

voltage is 4.79 V or more.

PROBABLE CAUSES

• Failed exhaust differential pressure sensor

• Open circuit in exhaust differential pressure sen-

sor circuit or loose connector contact

• Failed engine-ECU

AKB00280

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2

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4

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73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

1 2 3

AB

80

GR-B

P-G

B-O

56

94

A-148

Exhaust differential
pressure sensor

2

1

3

Exhaust Differential Pressure Sensor Circuit

C-105

5 V

Earth

Output signal

Power source

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-417

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-542

.

a. Item 120: exhaust differential pressure 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-148 exhaust
differential pressure sensor connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Perform resistance measurement at A-
148 exhaust differential pressure sensor
connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Resistance between terminal No. 2 and earth.

OK: Continuity (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 4 .

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.

AKB00281

3 2 1

AB

A-148 (B)

Harness side
connector

Connector: A-148

AKB00281

3 2 1

AB

A-148 (B)

Harness side
connector

Connector: A-148

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-418

STEP 5. Check harness between A-148 (terminal
No. 2) exhaust differential pressure sensor
connector and C-105 (terminal No. 80) engine-
ECU connector.

• Check earthing line for open circuit and damage.

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 120: exhaust differential pressure 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 ).

STEP 7. Replace the exhaust differential
pressure sensor

• After replacing the exhaust differential pressure

sensor, Carry out the forcible DPF regeneration.
(Refer to GROUP 17

− Emission Control − Diesel

Particulate Filter (DPF) System

− Forcible DPF

Regeneration ). After carrying out the forcible
DPF regeneration, re-check the trouble symp-
toms.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Check end.

Code No. P252F: Engine Oil Level Malfunction <Euro5>

FUNCTION

• The engine oil level may ascend if the fuel runs

into the engine oil on the DPF regeneration.

• The engine-ECU monitors the engine driving con-

ditions to estimate the ascend of engine oil level.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgement Criterion

• The estimated increased amount of the engine oil

exceeds the 1,000 cc.

PROBABLE CAUSE

• The engine oil is increased.

AKB00281

3 2 1

AB

A-148 (B)

Harness side
connector

Connector: A-148

AKA00089

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2

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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-419

DIAGNOSIS PROCEDURE

STEP 1. Replace the engine oil.

• Replace the engine oil, When the engine oil is

replaced, initialise the learning value (Refer to
GROUP 00

− Precautions before Service − Initial-

isation Procedure for Learning Value in Diesel
Particulate Filter (DPF) System ). After initialising
the learning value, reconfirm diagnosis code.

Q: Is the diagnosis code set?

YES :

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 ).

NO :

Check end.

Code No. U1073: Bus Off

CAUTION

If diagnosis code U1073 is output from engine-
ECU surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT

Check Condition

• All the time

Judgment Criterion

• When the buss off error is detected.

COMMENT ON TROUBLE SYMPTOM

• The failure is possibly caused by malfunction of

the harness and connector in CAN busline or by
malfunction in engine-ECU.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Correct CAN busline (Refer to GROUP 54C
− Troubleshooting − Can Bus Diagnostics
Table ), and then go to Step 3 .

STEP 2. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU.

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Are the diagnosis codes output?

YES :

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, the vehicle equipped
with the DPF carries out the forcible DPF
regeneration. (Refer to GROUP 17

−

Emission Control

− Diesel Particulate Filter

(DPF) System

− Forcible DPF Regeneration

). and then go to Step 3 .

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).