Mitsubishi Lancer Evolution X. Manual — part 25

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-125

DIAGNOSTIC ITEM 13: Diagnose the lines between joint connector (CAN2) and joint connector
(CAN3).

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-C Communication Circuit <M/T>

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

JOINT CONNECTOR
(CAN2)

JOINT CONNECTOR
(CAN3)

ASC-ECU

STEERING
WHEEL SENSOR

AWC-ECU

ENGINE CONTROL
MODULE

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-126

TRANSAXLE
ASSEMBLY

ENGINE CONTROL MODULE

CAN-C Communication Circuit <TC-SST>

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

JOINT CONNECTOR
(CAN2)

JOINT CONNECTOR
(CAN3)

JOINT CONNECTOR
(CAN4)

SHIFT LEVER

ASC-ECU

STEERING
WHEEL SENSOR

AWC-ECU

NOTE

: THE TERMINAL NUMBERS DESCRIBED

IN THE CIRCUIT DIAGRAM AGREE WITH
THE NUMBERS MARKED ON THE
TRANSAXLE ASSEMBLY CONNECTOR AND
HARNESS SIDE CONNECTOR.

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-127

.

FUNCTION

If a failure is present in the wiring harness between
the joint connector (CAN2) and the joint connector
(CAN3), this diagnosis result will be set.

.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for some of the
ECUs on the CAN-C line, the ETACS-ECU deter-
mines that there is a failure.

.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector

(CAN2), joint connector (CAN3) or intermediate
connector failed]

• Malfunction of the wiring harness [open circuit

between joint connector (CAN2) and joint con-
nector (CAN3)]

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN2) C-104, joint
connector (CAN3) C-127 and intermediate connector C-131
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-104, joint connector

(CAN3) C-127 and intermediate connector C-131 in good
condition?
YES : Go to Step 2.
NO : Repair the damaged parts.

AC708950BY

C-104

C-131

Connectors: C-104, C-131

AC708951CC

Connector: C-127

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-128

STEP 2. Check the wiring harness between joint connector
(CAN2) C-104 and joint connector (CAN3) C-127 for open
circuit.

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-7

.

(1) Disconnect joint connector (CAN2) C-104 and joint

connector (CAN3) C-127, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN2)

C-104 (terminal 4) and joint connector (CAN3) C-127
(terminal 5)

OK: Continuity exists (2 Ω or less)

(3) Check the wiring harness between joint connector (CAN2)

C-104 (terminal 15) and joint connector (CAN3) C-127
(terminal 16)

OK: Continuity exists (2 Ω or less)

Q: Is the wiring harness between joint connector (CAN2)

C-104 and joint connector (CAN3) C-127 in good
condition?
YES : The trouble can be an intermittent malfunction (Refer

to GROUP 00, How to use
Troubleshooting/inspection Service Points − How to

Cope with Intermittent Malfunction

P.00-15

).

NO : Repair the wiring harness between joint connector

(CAN2) C-104 and joint connector (CAN3) C-127.

AC709707BR

TEST
HARNESS

Harness side: C-104

TEST
HARNESS

Harness side: C-127

AC709707BS

Harness side: C-104

Harness side: C-127

TEST HARNESS

TEST
HARNESS