Mitsubishi Evolution X. Manual — part 730

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-367

STEP 3. Recheck of the SRS warning light
(1) Connect the negative battery terminal.
(2) Ignition switch: ON
Q: Does the light stay ON?

YES : Replace SRS-ECU (Refer to

P.52B-383

).

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

).

DATA LIST REFERENCE TABLE

M1524003500351

DATA LIST OUTPUT

.

The following items can be read by the scan tool from the SRS-ECU input data.

.

Item No.

Display on M.U.T.-III

Check conditions

Normal conditions

01

SRS warning light "ON"
request

• Ignition switch: ON

• After warning lamp pre-check

OFF

• Ignition switch: ON

• During warning lamp pre-check

ON

02

Pass. SRS light "ON"
request

• Ignition switch: ON

• After warning light pre-check

OFF

• Ignition switch: ON

• During warning light pre-check

ON

04

Passenger’s seatbelt
switch

• Ignition switch: ON

• After warning light pre-check

• Wear the passenger seatbelt.

Fastened

• Ignition switch: ON

• After warning light pre-check

• Undo the passenger seatbelt.

Unfastened

05

Passenger seat air bag
ignition

• Ignition switch: ON

• After warning light pre-check

• Apply a load to the passenger

seat.

Permission

• Ignition switch: ON

• After warning light pre-check

• Undo a load from a passenger

seat.

Prohibition

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-368

The following items can be read by the scan tool from the occupant classification-ECU input data.

ACTUATOR TEST REFERENCE TABLE

M1524003600198

The scan tool activates the following actuators for testing.

FAIL-SAFE FUNCTION REFERENCE TABLE

M1524003700151

If the SRS-ECU determines that the following parts
are defective, the SRS-ECU operates the SRS warn-
ing light and controls as follows.

• If the seat slide sensor is defective, the SRS-ECU

determines that the seat is in its backward posi-
tion and controls the air bag.

• If the occupant classification sensor or the occu-

pant classification-ECU is defective, the
SRS-ECU determines that the occupant classifi-
cation is class 2 [The occupant classification sen-
sor detects 30 kg (66 pounds) or more.] and
controls the air bag and the passenger’s air bag
OFF indicator light.

ACCURACY CHECK OF OCCUPANT CLASSIFICATION SENSOR REFERENCE TABLE

M1524025800060

The scan tool can be used to perform the next func-
tion.

• Seat Weight Sensor Accuracy Check

• Zero-calibration

Item No.

Display on M.U.T.-III

Check condition

Normal condition

01

Passenger weight

Apply a load to the passenger seat.

Load equivalent to passenger
seat crew member load

02

Dr seat position sensor
current

Slide the seat the back-end to the
front-position.

0 to 1,700 mA

03

Dr seat position sensor
voltage

Slide the seat the back-end to the
front-position.

0 to 5,000 mV

07

Dr seat position sensor
status

Slide the seat the back-end to the
front-position.

Not in Frontal Zone/In Frontal
Zone/Undetermined

08

occupant classification
status

Apply a load to the passenger seat.

Empty/RFIS/Child/More
5th%/Undermined

10

Battery voltage

Always

6.5 to 16 V

21

Pa seat weight sensor 1
RR

Apply a load to the passenger seat.

Load equivalent to passenger
seat crew member load

22

Pa seat weight sensor 1
RR volt

Apply a load to the passenger seat.

0 to 5,000 mV

23

Pa seat weight sensor 2
RF

Apply a load to the passenger seat.

Load equivalent to passenger
seat crew member load

24

Pa seat weight sensor 2
RF volt

Apply a load to the passenger seat.

0 to 5,000 mV

25

Pa seat weight sensor 3
LF

Apply a load to the passenger seat.

Load equivalent to passenger
seat crew member load

26

Pa seat weight sensor 3
LF volt

Apply a load to the passenger seat.

0 to 5,000 mV

27

Pa seat weight sensor 4
LR

Apply a load to the passenger seat.

Load equivalent to passenger
seat crew member load

28

Pa seat weight sensor 4
LR volt

Apply a load to the passenger seat.

0 to 5,000 mV

30

VIN Information

Always

−

Item No.
01

SRS warning light

SRS warning light illumination

ON

SPECIAL TOOLS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-369

SPECIAL TOOLS

M1524000701274

Tool

Tool number and name

Supersession

Application

MB990803
Steering wheel puller

General service tool

Steering wheel removal

MB991958

a: MB991824
b: MB991827
c: MB991910
d: MB991911
e: MB991914
f: MB991825
g: MB991826

Scan tool (M.U.T.-III sub
assembly)

a: Vehicle communication

interface (V. C. I.)

b: M.U.T.-III USB cable
c: M.U.T.-III main harness

A (Vehicles with CAN
communication
system)

d: M.U.T.-III main

harness B (Vehicles
without CAN
communication
system)

e: M.U.T.-III main

harness C (for Daimler
Chrysler models only)

f: M.U.T.-III measurement

adapter

g: M.U.T.-III trigger

harness

MB991824-KIT
NOTE: g: MB991826
M.U.T.-III Trigger
Harness is not
necessary when
pushing V.C.I. ENTER
key.

Checking diagnostic trouble code

CAUTION

For vehicles with CAN
communication, use M.U.T.-III
main harness A to send
simulated vehicle speed. If you
connect M.U.T.-III main harness
B instead, the CAN
communication does not
function correctly.

MB991865
Dummy resistor

SRS air bag and seat belt with
pre-tensioner circuit check

MB991866
Resistor harness

Driver’s and passenger’s (front)
air bag and side-air bag circuit
check

MB990803AB

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

Do not use

a

b

c

d

e

f

g

Do not use

MB991865

MB991866

TEST EQUIPMENT

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-370

TEST EQUIPMENT

M1524000800513

MB991884
Resistor harness

Knee air bag, curtain air bag and
seat belt with pre-tensioner circuit
check

MB991885
Adapter harness

Deployment of Knee air bag,
curtain air bag and seat belt with
pre-tensioner inside or outside
the vehicle

MB991223

a: MB991219
b: MB991220
c: MB991221
d: MB991222

Harness set

a: Test harness
b: LED harness
c: LED harness adaptor
d: Probe

General service tools

Checking the continuity and
measuring the voltage at the
SRS-ECU harness connector

MB992102
Air bag inflation adapter
harness

Deployment of driver’s and
passenger’s (front) air bag
module inside or outside the
vehicle

MB992006
Extra fine probe

General service tool

Continuity check and voltage
measurement at harness wire or
connector for loose, corroded or
damaged terminals, or terminals
pushed back in the connector.

Tool

Tool number and name

Supersession

Application

MB991884

MB991885

MB991223

a

d

c

b

Do not use

BD

MB992102

MB992006

Tool

Name

Use

Digital multi-meter
Use a multi-meter for which the maximum
test current is 2 mA or less at the minimum
range of resistance measurement

Checking the SRS electrical circuitry with
SRS check harness

AC000019AB