Mitsubishi Evolution X. Manual - part 952

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-169

STEP 1. Using scan tool MB991958, read the ETACS-ECU 
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.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.54A-105

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU (Refer to ETACS, 

Diagnosis 

P.54A-582

).

NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, check data list.
Using the ETACS-ECU service data, check the signals related 
to the illumination of turn-signal light.

• Turn the ignition switch to the "ON" position.

Q: Does scan tool MB991958 display the item "IG voltage" 

as normal condition?
YES : Go to Step 3.
NO :  Troubleshoot the ETACS-ECU. Refer to ETACS, 

Diagnosis - Inspection Procedure 2 "ETACS-ECU 
does not receive any signal from the ignition switch 
(IG1)" 

P.54A-639

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

Item No.

Item name

Normal 
conditions

Item 254

IG voltage

Battery voltage

HEADLIGHT

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CHASSIS ELECTRICAL

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STEP 3. Retest the system.
Check that turn-signal lights illuminate.
Q: Do turn-signal lights work normal?

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.

Inspection Procedure 12: The comfort flashing function does not work normally.

.

TECHNICAL DESCRIPTION (COMMENT)

If the comfort flashing function does not work nor-
mally, the turn-signal light switch input circuit(s) and 
ETACS-ECU may have a problem.

.

TROUBLESHOOTING HINTS

• Malfunction of column switch

• Malfunction of the ETACS-ECU

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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 (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, Check the 
configuration function.

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.

HEADLIGHT

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CHASSIS ELECTRICAL

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.  (1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.54A-105

."

(2) Turn the ignition switch to the "ON" position.
(3) Use the ETACS-ECU configuration function to check that 

the "Comfort flasher" is set to "Enable".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the "Comfort flasher" set to "Enable"?

YES : Go to Step 2.
NO :  Use the ETACS-ECU customize function to set the 

"Comfort flasher" to "Enable" (Refer to 

P.54A-183

).

STEP 2. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code. 
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU (Refer to ETACS, 

Diagnosis 

P.54A-582

).

NO :  Go to Step 3.

STEP 3. Check that the turn-signal light operate.
Check that the turn-signal light work normally when the ignition 
switch is in the "ON" position.
Q: Do turn-signal lights work normally?

YES : Go to Step 4.
NO :  Refer to Inspection Procedure 11 "The turn-signal 

lights do not illuminate" 

P.54A-168

.

STEP 4. Retest the system
Check that the comfort flashing function works normally.
Q: Does comfort flashing function works normally?

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

HEADLIGHT

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CHASSIS ELECTRICAL

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Inspection Procedure 13: The turn-signal indicator light do not illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the 
power supply circuit, the ground circuit and the 
communication circuit are normal.

.

TECHNICAL DESCRIPTION (COMMENT)

If the turn-signal light indicator does not illuminate 
normally, the harness in the CAN bus lines, connec-
tor(s), ETACS-ECU, or combination meter may have 
a problem.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Malfunction of combination meter

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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 (Vehicles with 

CAN communication system)

STEP 1. Check turn-signal light.
Check that the turn-signal light flashes normally when the 
turn-signal switch is operated.
Q: Do Turn-signal light work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure 11 "The turn-signal 

lights do not illuminate" 

P.54A-168

.