Mitsubishi L200. Manual — part 156

TROUBLESHOOTING

DIESEL FUEL

13A-420

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 output.

Q: Are the diagnosis codes output?

YES :

Go to Step 1 .

NO :

The check is end.

Code No. U1101: A/T-ECU Time-out <A/T>

CAUTION

If Diagnosis Code U1101 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

• The diagnosis code setting enabled signal is

received from ETACS-ECU.

Judgment Criterion

• The signals cannot be received from A/T-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/T-ECU, by malfunc-
tion in the power supply system of A/T-ECU, in
combination meter itself, in engine-ECU.

Past malfunction

• Focus on diagnosing malfunction of the harness

and connector in CAN busline between engine-
ECU and A/T-ECU as well as malfunction in the
power supply system of A/T-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/T-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/T-ECU.

Q: Is the diagnosis code output?

YES :

Perform the troubleshooting of A/T-ECU

(Refer to GROUP 23A

− Check Chart for

Diagnosis Code ).

NO :

Go to Step 3 .

TROUBLESHOOTING

DIESEL FUEL

13A-421

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

• Confirm whether Diagnosis Code U1101: A/T-

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/T-ECU, go to Step 6 .

NO :

Intermittent malfunction in CAN busline
between engine-ECU and A/T-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 A/T-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. U1102 ASTC-ECU Time-out <Except vehicles for Morocco>

CAUTION

If Diagnosis Code U1102 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

• The diagnosis code setting enabled signal is

received from ETACS-ECU.

Judgment Criterion

• The signals cannot be received from ASTC-ECU

for 65 second or more.

TROUBLESHOOTING

DIESEL FUEL

13A-422

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 ASTC-ECU, by mal-
function in the power supply system of ASTC-
ECU, in ASTC-ECU itself, in engine-ECU.

Past malfunction

• Focus on diagnosing malfunction of the harness

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

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope with

Intermittent Malfunctions ).

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

−

Explana-

tion About The M.U.T.-III Can Bus Diagnostics ).

PROBABLE CAUSE

• Failed of the harness and the connector

• Failed engine-ECU

• Failed ASTC-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?

YES :

Go to Step 2 .

NO :

Correct CAN busline (Refer to GROUP 54C
− Diagnosis − Can Bus Diagnostic Chart ),
and then go to Step 4 .

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

• Confirm whether the diagnosis codes are output

from ASTC-ECU.

Q: Is the diagnosis code output?

YES :

Perform the troubleshooting of anti-skid

braking system (Refer to GROUP 35B

−

Troubleshooting

− 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 :

Go to Step 4 .

NO :

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

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction ).

STEP 4. Replace the ASTC-ECU

• After replacing the ASTC-ECU, re-check the

diagnosis code 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 ).

NO :

The check is end.

TROUBLESHOOTING

DIESEL FUEL

13A-423

Code No. U1109: ETACS-ECU Time-out

CAUTION

If Diagnosis Code U1109 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

• The diagnosis code setting enabled signal is

received from ETACS-ECU.

Judgment Criterion

• The signals cannot be received from ETACS-

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 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 past trouble (Refer to GROUP 00

− How to

Use Troubleshooting/Inspection Service Points

−

How to Treat Past Trouble ) for the diagnosis pro-
cedure.

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

−

Can Bus

Diagnosis Table ).

PROBABLE CAUSES

• Failed of the harness and the connector

• Failed ETACS-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 Diagnosis
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 ETACS-ECU.

Q: Is the diagnosis code output?

YES :

Perform the troubleshooting of ETACS-ECU

(Refer to GROUP 54B

− Diagnostic Code

Chart )

NO :

Go to Step 3 . <A/T>

NO :

Go to Step 5 . <M/T>

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

• Confirm whether Diagnosis Code U1109:

ETACS-ECU time out is output from the following
ECU having CAN communication with automatic
transmission.

a. A/T-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?