Mitsubishi L200. Manual — part 119

TROUBLESHOOTING

DIESEL FUEL

13A-272

TROUBLE JUDGMENT

Check Conditions

• 2 seconds later after the ignition switch has been

in "ON" position or the engine has started up.

• Battery positive voltage is 10 V or more

Judgment Criterion

• The main microcomputer detects a main micro-

computer error.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• After erasing the diagnosis code through M.U.T.-

III, ignition switch is "ON" position and confirm
whether the diagnosis code is output.

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,
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 :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

Code No. P0620: Alternator Control Circuit <Euro5>

OPERATION

• When the ignition switch is turned ON, the current

should be supplied from the combination meter
(terminal No. 52) to the alternator (terminal No.
3). When the engine starts under those condi-
tions, the alternator should generate currents.

• The engine-ECU checks the voltage of the bat-

tery backup terminal (terminal No. 103) to moni-
tor the electricity generation voltage of the
alternator.

FUNCTION

• The engine-ECU compares the battery voltage

with the voltage generated from the alternator to
check whether the electrical generation is normal.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is "ON" position.

• The engine speed is 1 500 r/min or more.

• The battery backup voltage is 13.5 V or more.

• The G-terminal duty ratio is 10.2 % or more and

89.8 % or less.

Judgement Criterion

• For 30 seconds, the final target generation volt-

age subtracted from the battery backup voltage
equals 0.8 V or more.

or

• For 30 seconds, the battery backup voltage sub-

tracted from the final target generation voltage
equals 1.9 V or more.

PROBABLE CAUSES

• Failed battery

• Failed drive belt

• Loose connector contact

• Open/short circuit or harness damage in alterna-

tor G-terminal circuit

• Harness damage in battery backup circuit

• Failed alternator

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Checking engine start conditions

• Check whether the user uses the booster cable to

start the engine.

NOTE: This diagnosis code can be output due to the
battery voltage drop.

Q: Have you ever used the booster cable to start the

engine?
YES :

Delete the diagnosis code and check end.

NO :

Go to Step 2 .

TROUBLESHOOTING

DIESEL FUEL

13A-273

STEP 2. Battery check

• Check the battery (Refer to GROUP 54A − Bat-

tery

− On-vehicle Service − Battery Test ).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace the battery.

STEP 3. Drive belt tension check

• Drive belt tension check (Refer to GROUP 11A −

On-vehicle Service

− Alternator and Power Steer-

ing Oil Pump Drive Belt Tension Check ).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace the drive belt.

STEP 4. Connector check: C-103 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair or replace the connector.

STEP 5. Perform voltage measurement at C-103
engine-ECU connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 121 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Go to Step 6 .

STEP 6. Connector check: A-122 alternator
connector

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Repair or replace the connector.

AKA00090

101

102

103

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116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AKA00090

101

102

103

104

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C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AKB00292

M

2

1

3

4

AB

A-122 (GR)

Harness side
connector

Connector: A-122

TROUBLESHOOTING

DIESEL FUEL

13A-274

STEP 7. Check harness between C-103 (terminal
No. 121) engine-ECU connector and A-122
(terminal No. 1) alternator connector.

NOTE: Before checking harness, check intermediate
connectors A-27 and A-115, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES :

Check the alternator.

NO :

Repair the damaged harness wire.

STEP 8. Check harness between battery and C-
103 (terminal No. 103) engine-ECU connector.

NOTE: Before checking harness, check intermediate
connector A-115, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair the damaged harness wire.

STEP 9. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is diagnosis code set?

YES :

Go to Step 10 .

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

STEP 10. Replace the drive belt

• After replacing the drive belt, reconfirm whether

the diagnosis code is set.

Q: Is diagnosis code set?

YES :

Go to Step 11 .

NO :

Check end.

AKA00090

101

102

103

104

105

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144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AKB00292

M

2

1

3

4

AB

A-122 (GR)

Harness side
connector

Connector: A-122

AKA00090

101

102

103

104

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107

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C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

TROUBLESHOOTING

DIESEL FUEL

13A-275

STEP 11. Replace the alternator

• After replacing the alternator, reconfirm whether

the diagnosis code is set.

Q: Is 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. P0628: Suction Control Valve Open <Except Euro5>

OPERATION

• The voltage is applied from the engine-ECU (ter-

minal No. 131) to the suction control valve (termi-
nal No. 1) via the power transistor in the engine-
ECU.

• The voltage is earthed to the engine-ECU (termi-

nal No. 146) from the suction control valve (termi-
nal No. 2).

FUNCTION

• The engine-ECU performs duty control over the

suction control valve.

AKA00106

1

2

101 102

103104 105 106107 108109 110 111112 113 114115

118119 120 121122 123124 125126127 128 129130

131132 133 134135 136137 138139140 141142 143

146147 148 149150 151152 153154155 156 157158

117

145

116

144

Suction Control Valve Circuit

Suction
control
valve

A-47

(MU802768)

C-103

SB

P

2

146

131

1

Engine-ECU

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

AB