Mitsubishi L200. Manual — part 87

TROUBLESHOOTING

DIESEL FUEL

13A-144

STEP 5. Check harness between A-44 (terminal
No. 1) rail pressure sensor connector and C-105
(terminal No. 70) engine-ECU connector.

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

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the damaged harness wire.

STEP 6. Check harness between A-44 (terminal
No. 2) rail pressure sensor connector and C-105
(terminal No. 64) engine-ECU connector.

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

• Check output line for damage.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the damaged harness wire.

AK501327

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2

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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

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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

TROUBLESHOOTING

DIESEL FUEL

13A-145

STEP 7. Perform voltage measurement at A-44
rail pressure sensor connector.

• Use special tool test harness (MB991658) to con-

nect connector, and measure at pick-up harness.

• Engine: Idling (after warning up)

• Voltage between terminal No. 2 and earth.

OK: 1.15

− 1.75 V

Q: Is the check result normal?

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 ).

NO :

Replace the common rail assembly and fuel
injection tubes.

AK501327

1

2

3

AB

A-44 (B)

Harness side
connector

Connector: A-44

TROUBLESHOOTING

DIESEL FUEL

13A-146

Code No. P0192: Rail Pressure Sensor Circuit Low Input

OPERATION

• A power voltage of 5 V is applied to the rail pres-

sure sensor power terminal (terminal No. 1) from
the engine-ECU (terminal No. 70) and earthed to
the engine-ECU (terminal No. 88) from the rail
pressure sensor (terminal No. 3).

• The sensor signal is inputted to the engine-ECU

(terminal No. 64) from the rail pressure sensor
output terminal (terminal No. 2).

FUNCTION

• The rail pressure sensor converts the rail pres-

sure into a voltage signal and inputs the signal to
the engine-ECU.

• In response to the signal, the engine-ECU cor-

rects the fuel injection quantity.

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 rail pressure sensor output voltage is 0.70 V

or less for 0.5 second.

PROBABLE CAUSES

• Failed rail pressure sensor

• Open/short circuit or harness damage in rail pres-

sure sensor circuit or loose connector contact

• Failed engine-ECU

AKA00196

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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-147

DIAGNOSIS PROCEDURE

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

• Refer to Data List Reference Table

P.13A-542

.

a. Item 63: Rail 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-44 rail pressure
sensor connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Perform voltage measurement at A-44
rail pressure sensor connector.

• Use special tool test harness (MB991658) to con-

nect connector, and measure at pick-up harness.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Go to Step 4 .

STEP 4. Perform voltage measurement at C-105
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Ignition switch: ON

• Voltage between terminal No. 70 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Go to Step 5 .

AK501327

1

2

3

AB

A-44 (B)

Harness side
connector

Connector: A-44

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