Mitsubishi L200. Manual - part 118

TROUBLESHOOTING

DIESEL FUEL

13A-268

STEP 1. M.U.T.-III data list.

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 75: Power steering fluid pressure switch

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-134 power steering 
pressure switch connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check power steering pressure switch 
itself.

• Disconnect A-134 power steering fluid pressure 

switch connector.

• Continuity between terminal No.1 and earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Replace the power steering fluid pressure 

switch.

NO : 

Go to Step 4 .

STEP 4. Check at A-134 power steering fluid 
pressure switch connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No.1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 5 .

STEP 5. Connector check: C-103 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

AK501383

1

Harness side 
connector

Connector: A-134

A-134 (B)

AB

AK501383

1

Harness side 
connector

Connector: A-134

A-134 (B)

AB

AKA00090

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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-269

STEP 6. Check harness between C-103 (terminal 
No. 127) engine-ECU connector and A-134 
(terminal No. 1) power steering fluid pressure 
switch connector.

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

• Check output line for short circuit.

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 : 

Repair the damaged harness wire.

STEP 7. M.U.T.-III data list.

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 75: Power steering fluid pressure switch

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 ).

Code No. P0603: EEPROM Malfunction <Except Euro5>

FUNCTION

• To check whether the information such as the idle 

learned value and so on is stored in the memory 
of engine-ECU.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in ON position

AKA00090

101

102

103

104

105

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108

109

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112

113

114

115

118

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128

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149

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151

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153

154

155

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157

158

117

145

116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AK501383

1

Harness side 
connector

Connector: A-134

A-134 (B)

AB

TROUBLESHOOTING

DIESEL FUEL

13A-270

Judgement Criterion

• When the abnormal EEPROM memory data is 

detected.

PROBABLE CAUSE

• Failed the engine-ECU

DIAGNOSIS

STEP 1. Reconfirmation of diagnosis codes.

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 ).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

Code No. P0604: Random Access Memory (RAM) Malfunction

FUNCTION

• The engine-ECU writes information to RAM or 

reads information from RAM.

• The engine-ECU performs an initial check to 

detect errors in RAM.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgment Criterion

• A destroyed RAM is detected by engine-ECU ini-

tial check.

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. P0605: Read Only Memory (FLASH ROM) Malfunction

FUNCTION

• The engine-ECU reads information from flash 

ROM.

• The engine-ECU detects checksum errors.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgment Criterion

• In each inspection target area of a flash ROM, a 

checksum mismatch is detected three times con-
secutively.

TROUBLESHOOTING

DIESEL FUEL

13A-271

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. P0606: Engine-ECU (main CPU) Malfunction

FUNCTION

• The engine-ECU check whether the microcom-

puter, which performs the drive control of the 
throttle valve, is normal.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position

Judgment Criterion

• The monitoring microcomputer detects a main 

microcomputer error.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS

STEP 1. 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, 
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. P0607: Engine-ECU (sub CPU) Malfunction

FUNCTION

• The main microcomputer detects errors in the 

sub microcomputer used for monitoring.