Mitsubishi Outlander GS45X. Manual - part 1454

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-311

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-17

).

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

YES : Diagnose the KOS or WCM (Refer to GROUP 42B, 

Diagnosis

P.42B-35

 <KOS> or 42C, Diagnosis 

P.42C-18

 <WCM>). Then go to Step 4.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic 
trouble code No. U0168 for other system.
Check if the DTC U0168 is set in ETACS-ECU, occupant clas-
sification-ECU, combination meter, A/C-ECU, hands free mod-
ule, CAN box unit, radio and CD player, satellite radio tuner.
Q: Is the DTC set?

YES : Replace the KOS -ECU (Refer to GROUP 42B, 

KOS-ECU 

P.42B-201

) or WCM (Refer to GROUP 

42C, WCM 

P.42C-114

)

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-312

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the SRS-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 SRS-ECU.
NO :  There is an intermittent malfunction such as poor 

engaged connector(s) or open circuit (Refer to 
GROUP 00, How to use Troubleshooting/inspection 
Service Points 

P.00-15

).

DTC U0170: Front Impact Sensor (LH) Communication Error

CPU

CPU

ACCELERO
METER

ACCELERO
METER

SRS-ECU

Front Impact Sensor Circuit

FRONT IMPACT
SENSOR (RH)

FRONT IMPACT
SENSOR (LH)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-313

CAUTION

If DTC U0170 is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

CIRCUIT OPERATION

If an impact of set value or more is detected, the front 
impact sensor sends the coded acceleration data to 
SRS-ECU. Based on the acceleration data, 
SRS-ECU determines the necessity of driver's and 
front passenger's air bag deployment, and then turns 
ON the power supply circuit to the inflator.

.

DTC SET CONDITIONS

These DTCs are set if communication between the 
front impact sensor (LH) and the SRS-ECU is not 
possible or faulty.

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Malfunction of the front impact sensor (LH)

• Malfunction of the SRS-ECU

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)

AC901112

Connector: A-39

A-39 (Y)

AB

AC901075 AB

Connector: C-33

AC901076

C-28 (Y)

AB

Connector: C-28

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-314

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. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 3.
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

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector