Mitsubishi Outlander XL. Manual - part 576

OPERATION
AWD-ECU  receives  the  data  (such  as  ABS  sensor
signal, ABS operation signal) via the CAN bus lines.
If it cannot receive such data, it interrupts the system.

DTC SET CONDITIONS
If the following conditions are met when the system is
activated,  AWD-ECU  gradually  switches  the  control
from AWD to FWD, flashes the AWD/LOCK indicators
alternately, and sets the DTC No. U0121.

｠

IG1 voltage: 10 V or more

｠

ABS signal (such as wheel speed signal) cannot be
received.

TROUBLESHOOTING HINTS

Current trouble

｠

Wiring harness or connector failure between ASC-
ECU and the stop lamp switch

｠

Malfunction of the ABS sensor

｠

Malfunction of the stop lamp switch

｠

ASC-ECU malfunction

｠

AWD-ECU malfunction

Past trouble

｠

Refer to "How to treat past trouble" (GROUP 00 -
How to Treat Past Trouble P.00-17) for proceeding
the diagnostics.

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 54D - CAN

bus diagnostic chart P.54D-17.) Then go to Step 2.

STEP 2. Scan tool MB991958 data list
Check the following service data. (Refer to P.27C-87.)

｠

Item 07: CAN system (ABS/ASC)

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Troubleshoot the ABS system. (Refer to GROUP 35B -

Troubleshooting P.35B-9.)

STEP 3. Check the following connector:
Check the connectors below for improper engagement, terminal
damage or terminal drawn in the connector case.

｠

C-128 AWD-ECU connector

｠

C-313, C-317 ETACS-ECU connector

Q:Are the connectors and terminals in good condition?

YES:

 Go to Step 4.

NO:

 Repair the connector(s) or terminal(s). Then go to

Step 6.

STEP 4. Wiring harness check
Check  the  wiring  harness  between  the  C-128  AWD-ECU
connector and the C-313 ETACS-ECU connector for damage or
other problem.

Q:Is the wiring harness in good condition?

ELECTRONIC CONTROL AWD

27C-63

DIAGNOSIS

YES:

 Go to Step 5.

NO:

 Repair damage or other problem in the wiring harness.

Then go to Step 6.

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 No. U0121 set?

YES:

 Replace AWD-ECU. (Refer to P.27C-92.) Then go to

Step 6.

NO:

 This diagnosis is complete.

STEP 6. Check whether the DTC is reset.

Q:Is the DTC No. U0121 set?

YES:

 Diagnose again from Step 1.

NO:

 This diagnosis is complete.

DTC U0141: ETACS CAN time-out

M12704100051USA0000010000

｠

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  No.
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 Treat Past Trouble P.00-17) for proceeding
the diagnostics. Diagnose mainly wiring harness or
connector  failure  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
Malfunction (refer to GROUP 00 - 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 communication-linked ECUs. (Refer to GROUP
54D - CAN Bus Line Diagnostic Flow P.54D-10.)

DIAGNOSIS

｠

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

27C-64

ELECTRONIC CONTROL AWD

DIAGNOSIS

｠

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 54D - CAN

bus diagnostic chart P.54D-17.) Then go to Step 2.

STEP 2. Scan tool MB991958 data list
Check the following service data. (Refer to P.27C-87.)

｠

Item 09: CAN system (ETACS)

Q:Is the check result normal?

YES:

 Go to Step 6.

NO:

 Go to Step 3.

STEP 3. Scan tool MB991958 DTC of other systems
Check if a DTC, which relates to the CAN communication-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 No. 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 Cope
with Intermittent Malfunction 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 No. U0141 set?

YES:

 Replace AWD-ECU. (Refer to P.27C-92.) Then go to

Step 6.

NO:

 A poor connection, open circuit or other intermittent

malfunction in the CAN bus lines between ETACS-ECU and

ELECTRONIC CONTROL AWD

27C-65

DIAGNOSIS

AWD-ECU is suspected. (Refer to GROUP 00 - How to Cope
with Intermittent Malfunction P.00-15.)

STEP 6. Check whether the DTC is reset.

Q:Is the DTC No. U0141 set?

YES:

 Diagnose again from Step 1.

NO:

 This diagnosis is complete.

DTC U0401: Engine CAN data error

M12704100026USA0000010000

ETACS-ECU

FUSIBLE
LINK

34

IGNITION
SWITCH (IG1)

IG1
RELAY

AWD-ECU

D7G27M002A00

GREY

GREY

GREY

WHITE

WHITE

C-128

C-31

C-309

ZC6000240002

Connectors: C-128

C-128

ZC6000260001

ETACS-ECU
(front view)

C-313
(BR)

C-317

Connectors: C-313, C-317

27C-66

ELECTRONIC CONTROL AWD

DIAGNOSIS