Mitsubishi L200. Manual - part 157

TROUBLESHOOTING

DIESEL FUEL

13A-424

YES : 

After replacing the ETACS-ECU, go to Step 

6 .

NO : 

Intermittent malfunction in CAN busline 
between engine-ECU and ETACS-ECU 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

STEP 5. Reconfirmation of diagnosis codes

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Is the diagnosis code output?

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 ). and then go to Step 6  
.

NO : 

Intermittent malfunction in CAN busline 
between engine-ECU and ETACS-ECU 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

STEP 6. Reconfirmation of diagnosis codes

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Is the diagnosis code output?

YES : 

Go to Step 1 .

NO : 

The check is end.

Code No. U1110: A/C-ECU Time-out <Euro5>

CAUTION

If Diagnosis Code U1110 is output from engine-
ECU surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the 
communication circuits are normal.
NOTE: When the diagnosis codes relating to the 
CAN communication error are output, make sure of 
the vehicle equipment. When the vehicle is not 
equipped with the system the engine-ECU communi-
cates to, the diagnosis code is always output. This is 
not abnormal.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in "ON" position.

Judgment Criterion

• The signals cannot be received from A/C-ECU for 

0.5 second or more.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

•  The failure is possibly caused by malfunction of 

the harness and connector in CAN busline 
between engine-ECU and A/C-ECU, by malfunc-
tion in the power supply system of A/C-ECU, in A/
C-ECU itself, in engine-ECU.

TROUBLESHOOTING

DIESEL FUEL

13A-425

Past malfunction

• Focus on diagnosing malfunction of the harness 

and connector in CAN busline between engine-
ECU and A/C-ECU as well as malfunction in the 
power supply system of A/C-ECU. Refer to past 
trouble (Refer to GROUP 00 

− How to Use Trou-

bleshooting/Inspection Service Points 

− How to 

Treat Past Trouble ) for the diagnosis procedure.

NOTE: In case of Past trouble, M.U.T.-III CAN bus 

diagnosis cannot detect the failure even if there is 
malfunction in CAN bus, so that check CAN 
busline in the same way as Intermittent malfunc-
tion (Refer to GROUP 00 

−

 How to Use Trouble-

shooting/Inspection Service Points 

−

 How to 

Cope with Intermittent Malfunctions ). The diag-
nosis codes being output to each ECU with CAN 
communication can narrow down the most sus-
pected area (Refer to GROUP 54C 

−

 Trouble-

shooting 

−

 Can Bus Diagnostics Table ).

PROBABLE CAUSES

• Failed of the harness and the connector

• Failed A/C-ECU

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES : 

 Go to Step 2 .

NO : 

Correct CAN busline (Refer to GROUP 54C 
− Troubleshooting − CAN Bus Diagnostics 
Table ), and then go to Step 6 .

STEP 2. M.U.T.-III other system diagnosis codes.

• Confirm whether the diagnosis codes are output 

from A/C-ECU.

Q: Is the diagnosis code output?

YES : 

Perform the troubleshooting of A/C-ECU 

(Refer to GROUP 55B 

− Troubleshooting − 

Diagnostics Chart ).

NO  : 

Go to Step 3 .

STEP 3. M.U.T.-III other system diagnosis codes.

• Confirm whether Diagnosis Code U1110: A/C-

ECU time out is output from the following ECU 
having CAN communication with automatic trans-
mission.

a. ETACS-ECU

Q: Is the diagnosis code output?

YES : 

Go to Step 4 .

NO : 

Go to Step 5 .

STEP 4. Reconfirmation of diagnosis codes

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Is the diagnosis code output?

YES : 

After replacing the A/C-ECU, go to Step 6 .

NO : 

Intermittent malfunction in CAN busline 
between engine-ECU and A/C-ECU (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

STEP 5. Reconfirmation of diagnosis codes

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Is the diagnosis code output?

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 ). and then go 
to Step 6  .

NO : 

Intermittent malfunction in CAN busline 
between engine-ECU and A/C-ECU (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

TROUBLESHOOTING

DIESEL FUEL

13A-426

STEP 6. Reconfirmation of diagnosis codes

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Is the diagnosis code output?

YES : 

Go to Step 1 .

NO : 

The check is end.

Code No. U1117 ETACS-ECU (Immobilizer-ECU) Time-out 

CAUTION

If Diagnosis Code U1117 is output from engine-
ECU surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the 
communication circuits are normal.
NOTE: When the diagnosis codes relating to the 
CAN communication error are output, make sure of 
the vehicle equipment. When the vehicle is not 
equipped with the system the engine-ECU communi-
cates to, the diagnosis code is always output. This is 
not abnormal.
TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgment Criterion

• The signal from the ETACS-ECU is not received 

for 0.5 second or more.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

• The failure is possibly caused by malfunction of 

the harness and connector in CAN busline 
between engine-ECU and ETACS-ECU, by mal-
function in the power supply system of ETACS-
ECU, in ETACS-ECU itself, in engine-ECU.

Past malfunction

• Focus on diagnosing malfunction of the harness 

and connector in CAN busline between engine-
ECU and ETACS-ECU as well as malfunction in 
the power supply system of ETACS-ECU (Refer 
to GROUP 00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope with 

Intermittent Malfunctions ).

CAUTION

When the ignition key is maintained within the 
range "A" (i.e., the ignition switch IG2 is in OFF 
position but the cranking does not start) for more 
than 1 second, engine-ECU stores diagnosis 
code U1117 (the past trouble).
NOTE: In case of Past trouble, M.U.T.-III CAN bus 
diagnosis cannot detect the failure even if there is 
malfunction in CAN bus, so that check CAN busline 
in the same way as Intermittent malfunction (Refer to 
GROUP 00 

−

 How to Use Troubleshooting/Inspec-

tion Service Points 

−

 How to Cope with Intermittent 

Malfunctions ). The diagnosis codes being output to 
each ECU with CAN communication can narrow 
down the most suspected area. (Refer to GROUP 
54C 

−

 Explanation About The M.U.T.-III Can Bus 

Diagnostics ).

PROBABLE CAUSE

• Failed of the harness and the connector

• Failed engine-ECU

• Failed ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

AK503593 AB

Acc position

Lock (off)
position

On position

Start
position

Range
"A"

TROUBLESHOOTING

DIESEL FUEL

13A-427

YES : 

Go to Step 2 .

NO : 

Correct CAN busline (Refer to GROUP 54C 
− Diagnosis − Can Bus Diagnostic Chart ), 
and then go to Step 3 .

STEP 2. M.U.T.-III other system diagnosis codes

• Confirm whether the diagnosis codes are output 

from ETACS-ECU.

Q: Is the diagnosis code output?

YES  : 

Perform the troubleshooting of immobilizer 

system (Refer to GROUP 54A 

− Immobilizer 

System 

− Check Chart for Diagnosis Code ).

NO : 

Go to Step 3 .

STEP 3. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are out-

put. 

Q: Is the diagnosis code output?

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 in CAN busline 
between engine-ECU and ETACS-ECU 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.U1190: The Network System Diagnosis Code Output Permitted Signal Can Not Be Received

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position

Judgment Criterion

• The diagnosis enable signal from the ETACS-

ECU about the abnormal CAN is not received at 
all for 5 seconds or more after the ignition switch 
is on.

COMMENT ON TROUBLE SYMPTOM

• The ETACS-ECU sends the permitted / not per-

mitted signals for detecting the diagnosis code 
(U-code) to each ECU connected with the CAN 
busline. When the engine-ECU cannot receive 
the permitted / not permitted signals for detecting 
the diagnosis code (U-code) for 5seconds, the 
diagnosis code No. U1190 is stored. 

PROBABLE CAUSES

• Failed ETACS-ECU

• Failed CAN bus

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

• Using M.U.T.-III perform the CAN buslines diag-

nosis.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair the CAN busline (Refer to GROUP 
54C 

− Troubleshooting Can Bus 

Diagnostics Table ), and then go to Step 3 .

STEP 2. M.U.T.-III diagnosis code.

• Reconfirm whether the diagnosis codes are out-

put from engine-ECU.

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to "ON".
3. Confirm whether the diagnosis codes are output.

Q: Are the diagnosis codes output?

YES : 

Replace the ETACS-ECU, and then go to 

Step 3 .

NO : 

Check end.