Mitsubishi Montero Sport (2004+). Manual — part 743

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-41

CIRCUIT OPERATION

• If an analog G-sensor and saving G-sensor

inside the SRS-ECU sense a predetermined colli-
sion energy simultaneously during a frontal colli-
sion, the SRS-ECU sends igniting signal to the
pre-tensioner, causing the pre-tensioner to oper-
ate.

DTC SET CONDITIONS

• These DTC's are set if there is abnormal resis-

tance between the input terminals of the driver's
side seat belt pre-tensioner (squib). The most
likely causes for this code to be set are shown in
the table below:

NOTE: *: The squib circuit connectors integrate a "short" spring (which prevents the air bag from deploying
unintentionally due to static electricity by shorting the positive wire to the ground wire in the squib circuit when
the connectors are disconnected) (Refer to

P.52B-21

.) Therefore, if the connector is damaged or improperly

engaged, the short spring may not be released when the connector is connected.

.

TROUBLESHOOTING HITS

• Improper engaged connector or defective short spring*

• Damaged wiring harnesses or connectors

• Malfunction of the driver's side seat belt pre-tensioner

(squib)

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

• MB991865: Dummy resister

• MB991866: Resister harness

AC004095AC

CONNECTOR: E-61

E-61 (R)

DTC

SYMPTOM

26

• Short circuit in driver's side seat belt pre-tensioner (squib) or harness

27

• Open circuit in driver's side seat belt pre-tensioner (squib) or harness

• Malfunction of connector contact

66

• Short circuit in driver's side seat belt pre-tensioner (squib) harness leading to the

power supply

67

• Short circuit in driver's side seat belt pre-tensioner (squib) harness leading to the

ground

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-42

STEP 1. Check the driver’s side seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code.)

(1) Connect the dummy resistor (MB991865) to the resistor

harness (MB991866).

CAUTION

Do not directly insert a probe or other devices at the front
of the connector to avoid a possible decrease in the con-
tact pressure.
(2) Disconnect the passenger’s side air bag module connector

E-61 and insert the resistor harness (MB991866) behind
the harness side connector.

(3) Connect the negative (

−) terminal of the battery.

(4) Check the diagnostic trouble code again after erasing the

memory.

Q: Is any of DTC 26, 27, 66 or 67 set?

YES : Go to Step 2.
NO : Replace the driver's side seat belt pre-tensioner.

Refer to

P.52B-93

. Then go to Step 3.

AC102572 AG

DUMMY
RESISTOR (3

Ω)

(MB991865)

RESISTOR
HARNESS
(MB991866)

HARNESS SIDE
CONNECTOR

E-61 DRIVER'S SIDE
SEAT BELT PRE-TENSIONER
CONNECTOR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-43

STEP 2. Check harness wires between SRS-ECU
connector C-110 (terminal No.29 and 30) and driver's side
seat belt pre-tensioner connector E-61(terminal No.1 and
2).

NOTE: After inspecting intermediate connector E-62, inspect
the wiring harness.
If the intermediate connector E-62 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion

P.00E-2

.

Go to Step 3.
Q: Are harness wires between SRS-ECU connector C-110

(terminal No.29 and 130) and driver's side seat belt
pre-tensioner connector E-61 (terminal No.1 and 2) in
good condition?
YES : Go to Step 3.
NO : Repair or replace the harness wire. Then go to Step 3.

AC200764

24

40

31

23

41

32

42

33

29

37

28

38

22

26

21

34

25

35 36

27

39

30

C-10 (Y)

CONNECTOR:C-110

AD

C-110 HARNESS CONNECTOR:
HARNESS SIDE
(REAR VIEW)

C-110 (Y)

SRS-ECU

AC200757

1 2

CONNECTOR: E-61

AC

HARNESS CONNECTOR:
HARNESS SIDE
(REAR VIEW)

E-61 (R)

AC004096 AD

CONNECTOR: E-62

E-62 (R)

1 2

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-44

STEP 3. Recheck for diagnostic trouble code.
Q: Is any of DTC 26, 27, 66 or 67 set?

YES : Replace the SRS-ECU. Refer to

P.52B-82

.

NO : The procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-7

.)

DTC 34: Connector Lock System Detects Connector Unlocked

.

DTC SET CONDITIONS
This DTC is set if a poor connection at the SRS-ECU
is detected.
However, if the vehicle condition returns to normal,
DTC 34 will be automatically erased, and the SRS
warning light will go out.

.

TROUBLESHOOTING HINTS

• Damaged connectors

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B