Mitsubishi Evolution X. Manual — part 731

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-371

POST-COLLISION DIAGNOSIS

M1524001101639

To inspect and service the SRS after a collision (whether or not
the air bags have deployed), perform the following steps.

SRS-ECU MEMORY CHECK

Required Special Tool:

• 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)

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 to the data link connector

(16-pin).

2. Read (and write down) all displayed diagnostic trouble

codes (Refer to SRS-ECU

P.52B-31

, Occupant

classification-ECU

P.52B-297

).

NOTE: If the battery power supply has been disconnected or
disrupted by the collision, scan tool MB991958 cannot com-
municate with the SRS-ECU. Check the battery, then check
and, if necessary, repair the front wiring harness and the
instrument panel wiring harness before proceeding.

3. Read the data list (fault duration and how many times

memories are erased), using scan tool MB991958 (Refer to

P.52B-367

).

4. Erase the diagnostic trouble codes, and then turn the

ignition switch to the LOCK (OFF) position.

5. Wait for at least one second, and then turn the ignition

switch to the ON position again.

6. After waiting 15 seconds or more, note all displayed

diagnostic trouble codes (Refer to SRS-ECU

P.52B-31

,

Occupant classification-ECU

P.52B-297

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-372

REPAIR PROCEDURE

.

WHEN FRONT AIR BAGS DEPLOY IN A COLLI-
SION.

1. Replace the following parts with new ones:

• Front impact sensors (Refer to

P.52B-380

).

• SRS-ECU (Refer to

P.52B-383

).

• Driver’s air bag modules (Refer to

P.52B-386

).

• Passenger’s (front) air bag modules (Refer to

P.52B-393

).

• Knee air bag module (Refer to

P.52B-398

).

• Seat belt with pre-tensioner (Refer to

P.52B-413

).

• Instrument panel assembly (Refer to GROUP 52A, Instru-

ment Panel Assembly

P.52A-2

).

• Slide adjuster (RH) (Refer to GROUP 52A, Front Seat

Assembly

P.52A-24

).

2. Check the following parts and replace if there are any

malfunctions:

• Clock spring (Refer to

P.52B-386

).

• Seat slide sensor

• Seat belt switch (Refer to GROUP 52A, Front Seat Belt,

Inspection

P.52A-29

).

• Steering wheel, steering column shaft assembly

(1) Check the wiring harness (built into the steering wheel)

and connectors for damage, and terminals for
deformation.

(2) Install the air bag module to check fit and alignment with

the steering wheel.

(3) Check the steering wheel for noise, binding or difficult

operation and excessive free play.

(4) Check the steering column shaft shock absorbing

mechanism (Refer to GROUP 37, On-Vehicle Service

−

Steering Column Shaft Assembly Shock Absorbing
Mechanism Check).

3. Check the wiring harnesses for binding, the connectors for

damage, poor connections, and the terminals for
deformation (Refer to

P.52B-25

).

.

WHEN SIDE AIR BAGS DEPLOY IN A COLLISION.

1. Replace the following parts with new ones:

• SRS-ECU (Refer to

P.52B-383

).

• Side impact sensors (Refer to

P.52B-402

).

• Front seatback (Refer to GROUP 52A, Front Seat Assem-

bly

P.52A-24

).

• Slide adjuster (RH) (Refer to GROUP 52A, Front Seat

Assembly

P.52A-24

).

2. Check the wiring harnesses for binding, the connectors for

damage, poor connections, and the terminals for
deformation (Refer to

P.52B-25

).

.

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-373

WHEN AIR BAGS DO NOT DEPLOY IN
LOW-SPEED COLLISION.

Check the SRS components. If the SRS components are show-
ing any visible damage such as dents, cracks, or deformation,
replace them with new ones. Concerning parts removed for
inspection, replacement with new parts and cautionary points
for working, refer to appropriate INDIVIDUAL COMPONENT
SERVICE

P.52B-377

.

.

FRONT IMPACT SENSOR

1. Check the front end upper bar for distortion and rust.
2. Check the front impact sensor for dents, cracks, deformation

or rust.

3. Check the front impact sensor wiring harness for binding,

check the connector for damage, and check the terminals
for deformation.

NOTE: The illustration shows the side impact sensor (LH). The
position of the side impact sensor (RH) is symmetrical to this.

.

SRS-ECU

1. Check the SRS-ECU case and brackets for dents, cracks or

deformation.

2. Check the connector for damage, and the terminals for

deformation.

3. Check the installation of the SRS-ECU and its bracket.

.

AC608583

Front impact sensor

AB

AC605641

AC

SRS-ECU

Rear heater
duct (LH)

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-374

AIR BAG MODULES

1. Check the pad cover for dents, cracks or deformation.
2. Check the connector for damage, terminal deformities, and

the harness for binding.

3. Check the air bag inflator case for dents, cracks or

deformities.

4. Install the air bag module (driver's side) to the steering

wheel to check installation or alignment with the steering
wheel.

5. Install the air bag module (front passenger's side) to the

instrument panel and front deck crossmember to check
installation or alignment.

.

FRONT SEATBACK ASSEMBLY (SIDE-AIR BAG
MODULE)

1. Check the air bag module deployment section for dents or

deformation.

2. Check that there is no connector damage, bent terminals or

harness crimping.

.

AC709173

Squib
connectors

Inflator

Squib connectors

Inflator

<Driver's side>

<Passenger's side>

AB

<Knee air bag module>

Squib
connectors

Inflator

AC707634 AC

Side-airbag module
deployment section