Mitsubishi Lancer Evolution X. Manual - part 1

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-29

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

STEP 1. Check data link connector C-40 and ETACS-ECU 
connector C-301 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 data link connector C-40 and ETACS-ECU connector 

C-301 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts.

STEP 2. Check the wiring harness between data link 
connector C-40 and ETACS-ECU connector C-301 for open 
circuit.

CAUTION

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

P.54C-7

.

(1) Disconnect the scan tool and ETACS-ECU connector 

C-301, and check the wiring harness.

(2) Check the wiring harness between data link connector C-40 

(terminal 6) and ETACS-ECU connector C-301 (terminal 5) 
<CAN_H>

OK: Continuity exists (2 Ω or less)

(3) Check the wiring harness between data link connector C-40 

(terminal 14) and ETACS-ECU connector C-301 (terminal 
4) <CAN_L>

OK: Continuity exists (2 Ω or less)

Q: Is the wiring harness between data link connector C-40 

and ETACS-ECU connector C-301 in good condition?
YES : Go to Step 3.
NO :  Repair the wiring harness between data link 

connector C-40 and ETACS-ECU connector C-301.

AC709707

TEST 
HARNESS

Harness side: C-40

AE

TEST HARNESS

Harness side: C-301

AC709707

AC709707

TEST 
HARNESS

Harness side: C-40

AF

Harness side: C-301

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-30

STEP 3. Check the wiring harness between data link 
connector C-40 and ETACS-ECU connector C-301 for a 
short to ground. Measure the resistance at data link 
connector C-40.

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 the scan tool and ETACS-ECU connector 

C-301, and measure the resistance at the wiring harness 
side of data link connector C-40.

(2) Measure the resistance between data link connector 

terminal 6 and body ground. <CAN_H>

OK: 1 kΩ or more

(3) Measure the resistance between data link connector 

terminal 14 and body ground. <CAN_L>

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 4.
NO :  Repair the wiring harness between data link 

connector C-40 and ETACS-ECU connector C-301.

AC709707

TEST 
HARNESS

Harness side: C-40

AB

AC709707

Harness side: C-40

AC

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-31

STEP 4. Check the wiring harness between data link 
connector C-40 and ETACS-ECU connector C-301 for a 
short to the power supply. Measure the voltage at data link 
connector C-40.
(1) Disconnect the scan tool and ETACS-ECU connector 

C-301, and measure the resistance at the wiring harness 
side of data link connector C-40.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between data link connector terminal 6 

and body ground. <CAN_H>

OK: 1 V or less

(4) Measure the voltage between data link connector terminal 

14 and body ground. <CAN_L>

OK: 1 V or less

Q: Do all the voltage measure 1 V or less?

YES : Go to Step 5.
NO :  Repair the wiring harness between data link 

connector C-40 and ETACS-ECU connector C-301.

STEP 5. Check the wiring harness between data link 
connector C-40 and ETACS-ECU connector C-301 for 
line-to-line short. Measure the resistance at data link 
connector C-40.
(1) Disconnect the scan tool and ETACS-ECU connector 

C-301, and measure the resistance at the wiring harness 
side of data link connector C-40.

(2) Measure the resistance between data link connector 

terminal 6 and 14.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the wiring harness between data link 

connector C-40 and ETACS-ECU connector C-301.

AC709708

TEST 
HARNESS

Harness side: C-40

AB

AC709708

Harness side: C-40

AC

TEST 
HARNESS

AC709707

Harness side: C-40

AD

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-32

STEP 6. Using scan tool MB991958, diagnose the CAN bus 
line.

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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the scan tool screen 

is as shown in the illustration.

Q: Does the scan tool screen correspond to the 

illustration?
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 :  Replace the ETACS-ECU.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AC709542 AB

: Red section on screen

M.U.T.

J/C (3)

SAS

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

ENGINE

J/C (1)

ETACS

<M/T>

S-AWC

AC709543 AB

: Red section on screen

M.U.T.

J/C (3)

SAS

J/C (2)

KOS/WCM

SRS

A/C

AUDIO

MMCS

Sat Radio

HFM

OCM

METER

ASC

LEVER

ENGINE

J/C (1)

ETACS

<TC-SST>

S-AWC

TC-SST

J/C (4)