Mitsubishi L200. Manual - part 86

TROUBLESHOOTING

DIESEL FUEL

13A-140

STEP 6. Check harness between A-46 (terminal 
No. 1) fuel temperature sensor connector and C-
105 (terminal No. 55) engine-ECU connector.

• Check output line for open 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 21: Fuel temperature sensor

OK: At ambient temperature (fuel tempera-
ture) 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, 
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 ).

STEP 8. Perform resistance measurement at A-46 
fuel temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• 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 9 .

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

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

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

TROUBLESHOOTING

DIESEL FUEL

13A-141

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-46 (terminal 
No. 2) fuel temperature sensor connector and C-
105 (terminal No. 79) engine-ECU connector.

• Check earthing line for open circuit and 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

AK501326

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2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

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-142

Code No. P0191: Rail Pressure Sensor Range/Performance Problem

OPERATION

• 5 V power is supplied from the engine-ECU (ter-

minal No. 70) to the rail pressure sensor (terminal 
No. 1).

• The rail pressure sensor (terminal No. 3) is 

earthed to the engine-ECU (terminal No. 88).

• Sensor signals are input from the rail pressure 

sensor (terminal No. 2) to the engine-ECU (termi-
nal No. 64).

FUNCTION

• The engine-ECU monitors the signals input from 

the rail pressure sensor.

• Based on these signals, the engine-ECU checks 

the rail pressure sensor for errors.

TROUBLE JUDGMENT

Check Condition

• Engine is running.

Judgment Criterion

• A difference between the objective and actual rail 

pressures exceeds 15 MPa for 0.5 second, and 
the rail pressure sensor has an output voltage 
variation of 0.01 V or less.

PROBABLE CAUSES

• Failed rail pressure sensor

• Failed suction control valve

• Fuel line blocked

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check suction control valve itself.

• Check suction control valve itself (Refer to 

P.13A-

596

).

Q: Is the check result normal?

AKA00196

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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

Engine-ECU

W

R

B

W

R

B

B

A-44

(MU802408)

Rail pressure
sensor

2

1

3

5

6

4

A-131

64

70

88

Rail Pressure Sensor Circuit

AD

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

C-105

5 V

TROUBLESHOOTING

DIESEL FUEL

13A-143

YES : 

Go to Step 2.

NO : 

Replace the suction control valve. After 
replacing the suction control valve, learn the 
supply pump (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ).

STEP 2. Connector check: A-44 rail pressure 
sensor connector.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector.

STEP 3. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector.

STEP 4. Check harness between A-44 (terminal 
No. 3) rail pressure sensor connector and C-105 
(terminal No. 88) engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connector A-131, and repair if necessary.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the damaged harness wire.

AK501327

1

2

3

AB

A-44 (B)

Harness side 
connector

Connector: A-44

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

AK501327

1

2

3

AB

A-44 (B)

Harness side 
connector

Connector: A-44

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