Mitsubishi L200. Manual - part 89

TROUBLESHOOTING

DIESEL FUEL

13A-152

STEP 15. Perform voltage measurement at C-105 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Engine: Idle (after warning up)

• Voltage between terminal No. 64 and earth.

OK: 1.15 

− 1.75 V

Q: Is the check result normal?

YES : 

Go to Step 17 . 

NO : 

Go to Step 16 . 

STEP 16. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check intermediate connector A-131, and 

repair if necessary. If intermediate 
connector is normal, check and repair check 
harness between A-44 (terminal No. 2) rail 
pressure sensor connector and C-105 
(terminal No. 64) engine-ECU connector.

• Check output line for open circuit and 

damage.

NO : 

Repair or replace the connector.

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

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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2

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AB

A-44 (B)

Harness side 
connector

Connector: A-44

TROUBLESHOOTING

DIESEL FUEL

13A-153

STEP 17. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair or replace the connector.

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-154

Code No. P0193: Rail Pressure Sensor Circuit High 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 4.85 V 

or more for 0.5 second.

PROBABLE CAUSES

• Failed rail pressure sensor

• Open circuit in rail pressure 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

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3

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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-155

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 resistance measurement at A-44 
rail pressure sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 3 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.

AK501327

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2

3

AB

A-44 (B)

Harness side 
connector

Connector: A-44

AK501327

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2

3

AB

A-44 (B)

Harness side 
connector

Connector: A-44

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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