Mitsubishi L200. Manual — part 94

TROUBLESHOOTING

DIESEL FUEL

13A-172

Code No. P0204: No. 4 Injector Circuit Malfunction <Euro5>

OPERATION

• Driving power is supplied from the engine-ECU

(terminal No. 25) to the No. 4 injector (terminal
No. 2).

• The engine-ECU (terminal No. 27) turn on the

power transistor to flow current to the No. 4 injec-
tor (terminal No. 1).

FUNCTION

• The engine-ECU monitors peak current during

injector drive control to detect disconnection in
the injector No. 4 circuit.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in ON position

• Battery positive voltage is 8 V or more.

• Except during the engine cranking period

• When an engine-ECU internal capacitor is

allowed to be charged

Judgment Criterion

• When the peak current of the No. 4 injector circuit

is not detected, the circuit is judged to be open.

PROBABLE CAUSES

• Failed No. 4 injector

• Open/short circuit or harness damage in No. 4

injector circuit or loose connector contact

• Failed engine-ECU

AKA00099

1

2

3

4

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10 1112 13 14 15 16 17 18 19 20 21 22 23 24

25 26

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49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

43 44 45 46 47 48

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

AO

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

R-Y

Y-G

No. 4
injector

1

2

25

27

Engine-ECU

A-129

C-105

No. 4 Injector Circuit

TROUBLESHOOTING

DIESEL FUEL

13A-173

DIAGNOSIS PROCEDURE

CAUTION

A high-tension voltage is flowing between the
engine-ECU and the injectors while the engine is
running. Handle them carefully to avoid receiving
electric shocks from the voltage.

STEP 1. Connector check: A-129 No. 4 injector
connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace the connector.

STEP 2. Check No. 4 injector itself.

• Check No. 4 injector itself (Refer to

P.13A-595

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace the No. 4 injector. After replacing
the Injector, register the injector
identification code and learn fuel injection
(Refer to GROUP 00

− Precautions Before

Service

− What The Common Rail Engine

Learns ).

STEP 3. Check harness between No. 4 injector
connector and engine-ECU connector.

Check harness between A-129 (terminal No. 1) No. 4
injector connector and C-105 (terminal No. 27)
engine-ECU connector.

• Check earthing line for open/short circuit and

damage.

Q: Are the check results normal?

YES :

Go to Step 4 .

NO :

Repair the damaged harness wire.

AKA00189

1

2

Connector: A-129

Harness side
connector

AB

A-129 (GR)

AKA00189

1

2

Connector: A-129

Harness side
connector

AB

A-129 (GR)

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-174

STEP 4. Check harness between A-129 (terminal
No. 2) No. 4 injector connector and C-105
(terminal No. 25) engine-ECU connector.

• Check power supply line for open/short circuit

and damage.

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair or replace the connector.

STEP 5. Connector check: C-105 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair or replace the connector.

STEP 6. M.U.T.-III diagnosis code

• Reconfirmation of 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 :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

AKA00189

1

2

Connector: A-129

Harness side
connector

AB

A-129 (GR)

AKA00089

1

2

3

4

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6

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96

C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AKA00089

1

2

3

4

5

6

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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-175

Code No. P0204: No. 4 Injector Circuit Malfunction <Except Euro5>

OPERATION

• Driving power is supplied from the engine-ECU

(terminal No. 1) to the No. 4 injector (terminal No.
2).

• The engine-ECU (terminal No. 27) turn on the

power transistor to flow current to the No. 4 injec-
tor (terminal No. 1).

FUNCTION

• The engine-ECU monitors peak current during

injector drive control to detect disconnection in
the injector No. 4 circuit.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in ON position

• Battery positive voltage is 8 V or more.

• Except during the engine cranking period

• When an engine-ECU internal capacitor is

allowed to be charged

Judgment Criterion

• When the peak current of the No. 4 injector circuit

is not detected, the circuit is judged to be open.

PROBABLE CAUSES

• Failed No. 4 injector

• Open/short circuit or harness damage in No. 4

injector circuit or loose connector contact

• Failed engine-ECU

AKA00099

1

2

3

4

5 6 7 8 9

10 1112 13 14 15 16 17 18 19 20 21 22 23 24

25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

43 44 45 46 47 48

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

AM

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple SI: Silver

Y

Y-G

No. 4
injector

1

2

1

27

Engine-ECU

A-129

C-105

No. 4 Injector Circuit