Mitsubishi Outlander GS45X. Manual — part 1272

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-33

DIAGNOSTIC ITEM 2: Malfunction of the ETACS-ECU.

CAUTION

When servicing a CAN bus line, ground yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do, a component con-
nected to the CAN bus line may be broken.

.

FUNCTION

When the CAN bus diagnosis is carried out, the scan
tool sets communication "OK" flags in the patch
between the ETACS-ECU and active other ECUs. If
a commutation "OK" flag is not set for the ECUs
other than the ETACS-ECU, this diagnosis result will
be set.

.

TROUBLE JUDGEMENT CONDITIONS

If no communication flags are set for the ECUs (on
the CAN-B or CAN-C lines) other than the
ETACS-ECU, the ETACS-ECU determines that there
is a failure.

.

TROUBLESHOOTING HINT

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

Recheck for other system diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Check whether ETACS-ECU-related DTC is set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES (The DTC other than the U code is set.) :

Troubleshoot the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-733

.

YES (Only U-code DTC is set.) : Check the power supply

circuit of the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-782

.

NO (The DTC is not set.) : Check the power supply circuit

of the ETACS-ECU. Refer to GROUP 54A,
ETACS-ECU

P.54A-782

.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-34

DIAGNOSTIC ITEM 3: Abnormal short between the CAN-C bus lines.

CAUTION

When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted
water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

CAN Communication Circuit

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

STEERING WHEEL
SENSOR

AWD-ECU

AWC-ECU

JOINT CONNECTOR
(CAN2)

JOINT CONNECTOR
(CAN3)

TRANSAXLE
CONTROL MODULE

ASC-ECU

ABS-ECU

ENGINE CONTROL
MODULE

:VEHICLES WITHOUT ASC

NOTE

:VEHICLES WITH ASC

:6A/T

:CVT

:ELECTRONIC CONTROLLED AWD
:S-AWC

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-35

.

FUNCTION

If a line-to-line short is present in the CAN-C lines,
this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If only diagnostic trouble code U0001 is set, the
ETACS-ECU determines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector (joint connectors or

ECU connectors improperly connected)

• Malfunction of the wiring harness (line-to-line

short in the CAN-C main or sub bus lines)

• Malfunction of the ECU (ECU on CAN-C lines

failed)

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

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

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

• MB991970: ABS Check Harness

AC901112

Connectors: A-01, A-02

A-01 (B),
A-02 (B)

AD

AC901598

Connector: B-11

AB

B-11 (GR)

AC901075 AN

C-01

C-04

C-31

C-33

C-38

Connectors: C-01, C-04, C-31, C-33, C-38,
C-128, C-138, C-139

C-128,
C-139

C-138 (BR)

AC900844AV

Connector: C-209

ACA02655BB

Connector: C-301

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-36

STEP 1. Check joint connector (CAN2) C-04 and joint
connector (CAN3) for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to

P.54C-7

.

Q: Are joint connector (CAN2) C-04 and joint connector

(CAN3) C-01 in good condition?
YES <vehicles with ASC> : Go to Step 2.
YES <vehicles without ASC (FWD)> : Go to Step 5.
YES <vehicles without ASC (Electric controlled AWD)> :

Go to Step 3.

NO : Repair the damaged parts.

STEP 2. Check the wiring harness between joint connector
(CAN2) C-04 and steering wheel sensor connector C-209
for line-to-line short. Measure the resistance at joint
connector (CAN2) C-04.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-7

.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-7

.

CAUTION

The test wiring harness should be used. For details refer to

P.54C-7

.

(1) Disconnect joint connector (CAN2), and check that there is

continuity at the harness side of joint connector (CAN2).

(2) Check that there is continuity between joint connector

(CAN2) terminals 4 and 15.

OK: No continuity

Q: Is the check result normal?

YES <FWD> : Go to Step 5.
YES <Electric controlled AWD> : Go to Step 3.
YES <S-AWC> : Go to Step 4.
NO : Go to Step 9.

AC703868

Test harness

Harness side: C-04

AB

Test harness