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Mitsubishi Outlander XL. Manual - part 575

ZC6000240002

Connectors: C-128

C-128

ZC6000260001

ETACS-ECU
(front view)

C-313
(BR)

C-317

Connectors: C-313, C-317

｠

If more than three minutes elapse after the
ignition switch is turned ON without starting
engine, AWD-ECU may set DTC U0100 as past
trouble.

｠

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 it
has not received the signal from the engine-ECU.

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
No. U0001.

｠

IG1 power supply voltage: 10 V or more

｠

Chassis No. signal, throttle angle signal, or engine
speed signal cannot be received.

TROUBLESHOOTING HINTS

Current trouble

｠

Wiring harness or connector failure in the CAN bus
lines between the engine ECU and AWD-ECU

｠

Engine 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. Diagnose mainly wiring harness or
connector failure in the CAN bus lines between the
engine ECU and AWD-ECU, and malfunction in the
power supply system for the engine 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)

｠

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?

ELECTRONIC CONTROL AWD

27C-59

DIAGNOSIS

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 DTC of other systems
Check that the bus-off error DTC is set in the engine control
system.

Q:Is the DTC set?

YES:

Troubleshoot the engine control system. (Refer to

GROUP 13Ab - Diagnostic Trouble Code Chart P.13Ab-44.)

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
U0100: Engine CAN time-out DTC

｠

ETACS
U0100: Engine CAN time-out DTC

｠

A/C
U0100: Engine CAN time-out DTC

Q:Is the DTC set?

YES:

Go to Step 4.

NO:

Go to Step 7.

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. U0100 set?

YES:

Replace the engine control module. (Refer to GROUP

13Aa - Engine Control Module P.13Aa-37.) Then go to Step
8.

NO:

A poor connection, open circuit or other intermittent

malfunction in the CAN bus lines between the engine ECU
and the AWD-ECU is suspected. (Refer to GROUP 00 - How to
Cope with Intermittent Malfunction P.00-15.) Then go to
Step 5

STEP 5. 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 6.

NO:

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

Step 8.

STEP 6. 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.

27C-60

ELECTRONIC CONTROL AWD

DIAGNOSIS

Q:Is the wiring harness in good condition?

YES:

Go to Step 7.

NO:

Repair damage or other problem in the wiring harness.

Then go to Step 8.

STEP 7. Check whether the DTC is reset.

Q:Is the DTC No. U0100 set?

YES:

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

Step 8.

NO:

A poor connection, open circuit or other intermittent

malfunction in the CAN bus lines between the engine ECU
and AWD-ECU is suspected. (Refer to GROUP 00 - How to Cope
with Intermittent Malfunction P.00-15. )

STEP 8. Check whether the DTC is reset.

Q:Is the DTC No. U0100 set?

YES:

Diagnose again from Step 1.

NO:

This diagnosis is complete.

ELECTRONIC CONTROL AWD

27C-61

DIAGNOSIS

DTC U0121: ABS CAN time-out

M12704100050USA0000010000

ETACS-ECU

FUSIBLE
LINK

IGNITION
SWITCH (IG1)

IG1
RELAY

AWD-ECU

D7G27M002A00

GREY

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

｠

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.

27C-62

ELECTRONIC CONTROL AWD

DIAGNOSIS

Content .. 573 574 575 576 ..