Mitsubishi Outlander GS45X. Manual — part 1474

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-391

DTC U0020: CAN-B Bus Off Performance

DTC U0021: CAN-B Bus(H1) Circuit Open

DTC U0022: CAN-B Bus(H1) Shorted to Circuit Ground

DTC U0023: CAN-B Bus(H1) Shorted to Circuit Power Supply

DTC U0024: CAN-B Bus(L0) Circuit Open

DTC U0025: CAN-B Bus(L0) Shorted to Circuit Ground

DTC U0026: CAN-B Bus(L0) Shorted to Circuit Power Supply

CAUTION

• If the DTC U0020, U0021, U0022, U0023,

U0024, U0025, U0026 is set in the occupant
classification-ECU, always diagnose the CAN
main bus lines.

• When replacing the ECU, always check that

the communication circuit is normal.

.

DTC SET CONDITIONS

If the CAN-B circuit malfunction is present, the occu-
pant classification-ECU sets the DTC U0020, U0021,
U0022, U0023, U0024, U0025, U0026.

.

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

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.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) 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-17

).

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-392

STEP 2. Recheck for diagnostic trouble code
Check again if the DTC is set to the occupant classifica-
tion-ECU.

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

YES : Replace the passenger seat cushion frame assembly

(Refer to GROUP 52A, Front Seat Assembly

P.52A-19

).

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 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)

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-393

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-17

).

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. Then go to Step 4.
NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic
trouble code No. U0141 for other system.
Check if the DTC U0141 is set in SRS-ECU, combination
meter, A/C-ECU, KOS-ECU or WCM, hands free module, CAN
box unit, radio and CD player, satellite radio tuner.
Q: Is the DTC set?

YES : Replace the ETACS-ECU (Refer to GROUP 54A,

ETACS

− ETACS-ECU

P.54A-826

).

NO : Go to Step 4.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-394

STEP 4. 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 passenger seat cushion frame assembly

(Refer to GROUP 52A, Front Seat Assembly

P.52A-17

).

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)