Mitsubishi Outlander GS45X. Manual — part 1336

DIAGNOSIS

TSB Revision

ELECTRONIC CONTROL AWD

27C-67

DTC U0141: ETACS CAN time-out

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect DTC may be set. Prior to this
diagnosis, always diagnose the CAN bus
lines.

• Before replacing the ECU, ensure that the

communication circuit is normal.

.

OPERATION

AWD-ECU receives the data (such as drive mode
display signal, failure information signal) from
ETACS-ECU via the CAN bus lines. If it cannot
receive such data, illuminates the AWD indicator.

.

DTC SET CONDITIONS

If the following conditions are met when the system
is in operation (always), AWD-ECU flashes the
AWD/LOCK indicators alternately, and sets the DTC
U0141.

• IG1 power supply voltage: 8 V or more

• The signal output from ETACS-ECU cannot be

received.

.

TROUBLESHOOTING HINTS

Current trouble

• Wiring harness or connector failure in the CAN

bus lines between ETACS-ECU and AWD-ECU

• Malfunction of ETACS-ECU

• AWD-ECU malfunction

Past trouble

• Refer to "How to treat past trouble" (GROUP 00 −

How to Use Troubleshooting/How to Treat Past
Trouble

P.00-17

) for proceeding the diagnostics.

Diagnose mainly wiring harness or connector fail-
ure in the CAN bus lines between ETACS-ECU
and AWD-ECU, and malfunction in the power
supply system for ETACS-ECU.
NOTE: For a past trouble, you cannot find it by
the scan tool MB991958 CAN bus diagnostics
even if there is any failure in CAN bus lines. In
this case, check the CAN bus lines in the same
manner as How to Cope with Intermittent Mal-
function (refer to GROUP 00

−

How to Use Trou-

bleshooting/How to Cope with Intermittent
Malfunction

P.00-15

). You can narrow down the

possible cause of the trouble by referring to the
DTC, which is set regarding the CAN communi-
cation-linked ECUs. (Refer to GROUP 54C

−

CAN Bus Line Diagnostic Flow

P.54C-10

.)

DIAGNOSIS

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C

−

Troubleshooting/CAN Bus Diagnostics Table

P.54C-17

), Then go to Step 2.

STEP 2. Scan tool MB991958 data list
Check the following data list (Refer to

P.27C-90

).

• Item 09: CAN system (ETACS)

Q: Is the check result normal?

YES : Go to Step 6.
NO : Go to Step 3.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-68

STEP 3. Scan tool MB991958 DTC of other systems
Check if a DTC, which relates to the CAN communica-
tion-linked systems below, is set.

• Meter

U0141: ETACS CAN time-out DTC

• A/C

U0141: ETACS CAN time-out DTC

• Engine

U0141: ETACS CAN time-out DTC

Q: Is the DTC set?

YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(3) Check if the DTC is set.
Q: Is the DTC U0141 set?

YES : Replace ETACS-ECU. Then go to Step 6.
NO : A poor connection, open circuit or other intermittent

malfunction in the CAN bus lines between
ETACS-ECU and AWD-ECU is suspected (Refer to
GROUP 00

− How to Use Troubleshooting/How to

Cope with Intermittent Malfunctions

P.00-15

).

STEP 5. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(3) Check if the DTC is set.
Q: Is the DTC U0141 set?

YES : Replace AWD-ECU (Refer to

P.27C-95

). Then go to

Step 6.

NO : A poor connection, open circuit or other intermittent

malfunction in the CAN bus lines between
ETACS-ECU and AWD-ECU is suspected (Refer to
GROUP 00

− How to Use Troubleshooting/How to

Cope with Intermittent Malfunctions

P.00-15

).

STEP 6. Check whether the DTC is reset.
Q: Is the DTC U0141 set?

YES : Diagnose again from Step 1.
NO : This diagnosis is complete.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-69

DTC U0401: Engine CAN data error

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect DTC may be set. Prior to this
diagnosis, always diagnose the CAN bus
lines.

• Before replacing the ECU, ensure that the

communication circuit is normal.

.

OPERATION

AWD-ECU temporarily limits the AWD functions if an
abnormality in the throttle opening angle signal is
detected.

.

DTC SET CONDITIONS

If the following conditions are met when the system
is in operation (always), AWD-ECU gradually
switches the control from AWD to AWD AUTO,
flashes the AWD/LOCK indicators alternately, and
sets the DTC U0401.

• IG1 voltage: 10 V or more

• Throttle opening angle signal: More than 100%

.

TROUBLESHOOTING HINTS

Current trouble

• Damaged wiring harness and connectors

• Malfunction of accelerator pedal position sensor

• Malfunction of crankshaft position sensor

• Engine control module malfunction

• AWD-ECU malfunction

Past trouble

• Refer to "How to treat past trouble" (GROUP 00 −

How to Use Troubleshooting/How to Treat Past
Trouble

P.00-17

) for proceeding the diagnostics.

Diagnose mainly wiring harness or connector fail-
ure between the engine control module and the
accelerator pedal position sensor or between the
engine control module and the crank angle sen-
sor.

DIAGNOSIS

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C

−

Troubleshooting/CAN Bus Diagnostics Table

P.54C-17

). Then go to Step 2.

STEP 2. Scan tool MB991958 data list
Check the following data list (Refer to

P.27C-90

).

• Item 08: CAN data (Engine)

Q: Is the check result normal?

YES : Go to Step 7.
NO : Go to Step 3.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-70

STEP 3. Scan tool MB991958 DTC of other systems
Check if a DTC related to the accelerator pedal position sensor
system or the crank angle sensor system is set in the engine
control system.
Q: Is the DTC set?

YES : Troubleshoot the engine control system (Refer to

GROUP 13A

− Troubleshooting/DTC Chart

P.13A-49

<4B1>, GROUP 13B

− Troubleshooting/DTC Chart

P.13B-50

<6B3>).

NO : Go to Step 4.

STEP 4. Scan tool MB991958 DTC of other systems
Check if a DTC, which relates to the CAN communica-
tion-linked systems below, is set.

• Meter

U0401: DTC of engine-related failure information

Q: Is the DTC set?

YES : Go to Step 5.
NO : Go to Step 6.

STEP 5. Check whether the DTC is reset.
Q: Is the DTC U0401 set?

YES : Replace the engine control module (Refer to GROUP

13A

− Engine Control Module

P.13A-887

<4B1>,

GROUP 13B

− Engine Control Module

P.13B-903

<6B3>). Then go to Step 7 .

NO : A poor connection, open circuit or other intermittent

malfunction between the engine control module and
the accelerator pedal position sensor, or between the
engine control module and the crank angle sensor is
suspected (Refer to GROUP 00

− How to Use

Troubleshooting/How to Cope with Intermittent
Malfunctions

P.00-15

). Then to Step 6.

STEP 6. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(3) Depress the throttle pedal fully.
(4) Check if the DTC is set.
Q: Is the DTC U0401 set?

YES : Replace AWD-ECU (Refer to

P.27C-95

). Then go to

Step 7 .

NO : A poor connection, open circuit or other intermittent

malfunction between the engine control module and
the accelerator pedal position sensor, or between the
engine control module and the crank angle sensor is
suspected (Refer to GROUP 00

− How to Use

Troubleshooting/How to Cope with Intermittent
Malfunction

P.00-15

).