Mitsubishi Outlander GS45X. Manual - part 1455

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-315

STEP 3. Check for any diagnostic trouble code. (Using
scan tool MB991958, read the diagnostic trouble code.)
Check the front impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the front impact sensor (LH) and front impact

sensor (RH), and then install the alternated sensors.

(3) Connect the negative battery terminal.
(4) Erase diagnostic trouble code from memory, and check the

diagnostic trouble code.

Q: Is DTC U0171 set?

YES : Replace the front impact sensor (LH) with a new one.

(Refer to

P.52B-433

). Go to Step 5.

NO : Go to Step 4.

STEP 4. Check the harness wires for open circuit and short
circuit between SRS-ECU connector C-28 (terminal No.21
and 22) and front impact sensor (LH) connector A-39
(terminal No.2 and 1).
NOTE: After inspecting intermediate connector C-33 inspect
the wiring harness. If the intermediate connector C-33 is dam-
aged, repair or replace it.
Q: Are the harness wires between SRS-ECU connector

C-28 (terminal No.21 and 22) and front impact sensor
(LH) connector A-39 (terminal No.2 and 1) in good
condition?
YES : Go to Step 5.
NO : Repair the harness wires between SRS-ECU

connector C-28 and front impact sensor (LH)
connector A-39.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-316

STEP 5. 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 DTC U0170 set?

YES : Replace SRS-ECU (Refer to

P.52B-436

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 U0171: Front Impact Sensor (RH) Communication Error

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

CPU

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-317

CAUTION

If DTC U0171 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 (RH) and the SRS-ECU is not
possible or faulty.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Malfunction of the front impact sensor (RH)

• 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-53

A-53 (Y)

AC901075 AB

Connector: C-33

AC901076

C-28 (Y)

Connector: C-28

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-318

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

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