Mitsubishi Evolution X. Manual — part 724

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-343

DTC U0141: ETACS CAN Timeout

CAUTION

• If the DTC U0141 is set in the occupant classi-

fication-ECU, always diagnose the CAN main
bus lines.

• When replacing the ECU, always check that

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

If the signal from ETACS-ECU cannot be received,
the occupant classification-ECU sets the DTC
U0141.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if
occupant classification-ECU becomes unable to per-
form the normal data transmission, occupant classifi-
cation-ECU determines that an abnormality is
present.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective

• The ETACS-ECU may be defective

• The occupant classification-ECU may be defec-

tive

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles 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, 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. Refer to "How to connect the

scan tool

P.52B-28

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-344

STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU.
NO : Go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classifica-
tion-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the slide adjuster (RH) (Refer to GROUP

52A, Front Seat Assembly

P.52A-24

).

NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-15

).

DTC U0151: SRS-ECU CAN timeout

CAUTION

• If DTC U0151 is set in the occupant classifica-

tion-ECU, always diagnose the CAN main bus
lines.

• When replacing the ECU, always check that

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

If the signal from SRS-ECU cannot be received, the
occupant classification system sets DTC U0151.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if
occupant classification-ECU becomes unable to per-
form the normal data transmission, occupant classifi-
cation-ECU determines that an abnormality is
present.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective

• The SRS-ECU may be defective

• The occupant classification-ECU may be defec-

tive

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles 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)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-345

STEP 1. 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. Refer to "How to connect the

Scan Tool (M.U.T.-III)

P.52B-28

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

STEP 2. Using scan tool MB991958, read the SRS-ECU
diagnostic trouble code.
Check again if the DTC is set to the SRS-ECU.
Q: Is the DTC set?

YES : Diagnose the SRS-ECU.
NO : Go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classifica-
tion-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the slide adjuster (RH) (Refer to GROUP

52A, Front Seat Assembly

P.52A-24

).

NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-15

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-346

DTC U0155: Combination Meter CAN Timeout

CAUTION

• If the DTC U0155 is set in the occupant classi-

fication-ECU, always diagnose the CAN main
bus lines.

• When replacing the ECU, always check that

the communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from combination meter cannot be
received, the occupant classification-ECU sets the
DTC U0155.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if
occupant classification-ECU becomes unable to per-
form the normal data transmission, occupant classifi-
cation-ECU determines that an abnormality is
present.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective

• The combination meter may be defective

• The occupant classification-ECU may be defec-

tive

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles 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, 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. Refer to "How to connect the

scan tool

P.52B-28

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB