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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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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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 ).