Mitsubishi Outlander XL. Manual - part 577

｠

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
No. 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 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 between the engine ECU and the
accelerator pedal position sensor or between the
engine ECU and the crank angle sensor.

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 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 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
U0401: DTC of engine-related failure information

Q:Is the DTC set?

YES:

Go to Step 4.

NO:

Go to Step 7.

ELECTRONIC CONTROL AWD

27C-67

DIAGNOSIS

STEP 4. Check whether the DTC is reset.

Q:Is the DTC No. U0401 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 between the engine ECU and the accelerator
pedal position sensor, or between the engine ECU and the
crank angle sensor is suspected. (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction P.00-15). Then to
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.

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.

(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 No. U0401 set?

YES:

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

Step 8.

NO:

A poor connection, open circuit or other intermittent

STEP 8. Check whether the DTC is reset.

Q:Is the DTC No. U0401 set?

YES:

Diagnose again from Step 1.

NO:

This diagnosis is complete.

27C-68

ELECTRONIC CONTROL AWD

DIAGNOSIS

DTC U0415: ABS CAN data error

M12704100027USA0000010000

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.

ELECTRONIC CONTROL AWD

27C-69

DIAGNOSIS

OPERATION
AWD-ECU receives the data (such as wheel speed
sensor signal) from ASC-ECU via the CAN bus lines.
If it detects malfunction of the wheel speed signal, it
interrupts the system.

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 FWD, flashes the AWD/
LOCK indicators alternately, and sets the DTC No.
U0415.

｠

IG1 voltage: 10 V or more

｠

If the received wheel speed of one or more wheels
reaches or exceeds the threshold value of 4000 r/
min, or the received wheel speed of one or more
wheels is SNA.

NOTE:

SNA (Signal not available)

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)

｠

Item 16: FL wheel speed sensor

｠

Item 17: FR wheel speed sensor

｠

Item 18: RL wheel speed sensor

｠

Item 19: RR wheel speed sensor

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?

27C-70

ELECTRONIC CONTROL AWD

DIAGNOSIS

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