Mitsubishi Montero (2002-2004). Manual — part 793
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
52Bb-41
STEP 2. Check the harness for open circuit between SRS-
ECU connector E-07 (terminal No.29 and 30) and the
driver's seat belt pretensioner F-27 (terminal No.1 and 2).
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(1) Disconnect SRS-ECU connector E-07 and driver's seat belt
pretensioner connector F-27, and measure at the wiring
harness.
(2) Check for continuity between the following terminals.
Between connector E-07 terminal 30 and connector F-27
terminal 1
Between connector E-07 terminal 29 and connector F-27
terminal 2
It should be less than 2 ohms.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code sets. If DTC 27 sets,
replace the SRS-ECU. (Refer to
.) Then go
to Step 3.
NO : Repair harness wires between SRS-ECU connector
E-07 and driver’s seat belt pre-tensioner connector F-
27. Then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 27 set?
YES : Return to Step 1.
NO : The procedure is complete. (If no malfunctions are not
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
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
AC204126
AB
CONNECTOR: F-27
F-27 (R)
CENTER
PILLAR
AC006245
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
E-07 HARNESS
CONNECTOR:
HARNESS SIDE
F-27 HARNESS CONNECTOR:
HARNESS SIDE
AF
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
52Bb-42
DTC 28: Passenger’s (Front) Seat Belt Pre-Tensioner (Squib) System Fault 1 (Short Circuit between
Terminals of the Squib Circuit)
.
AC102676
Passenger's (Front) Seat Belt Pre-tensioner (Squib)
AB
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
AC204603AD
CONNECTOR: E-16
FLOOR
CONSOLE
E-16
AC204127
AB
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
52Bb-43
CIRCUIT OPERATION
The side impact sensor includes an analog G sensor
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the side-air-
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the side-airbags. Besides that,
the CPU diagnoses the internal components of the
side impact sensor. If a malfunction occurs, it
requests the SRS-ECU to set a diagnostic trouble
code.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the passenger’s seat
belt pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Short circuit between the passenger's seat belt
pretensioner (squib) circuit terminals
• Damaged connector(s)
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-ll)
• MB991865: Dummy resister
• MB991866: Resister harness
STEP 1. Check the diagnostic trouble code.
Q: Is DTC 34 set?
YES : Go to Step 2.
NO : Go to Step 3.
STEP 2. Check the SRS-ECU connector E-07.
Q: Is connector correctly engaged?
YES : Go to Step 3.
NO : Engage the connector to the place. Then go to Step 7.
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
52Bb-44
STEP 3. Check SRS-ECU connector E-07 and passenger’s
seat belt pre-tensioner connector F-29.
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-29, and then
reconnect them.
(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code memory, and the
diagnostic trouble code.
Q: Is DTC 28 set?
YES : Go to Step 4.
NO : The procedure is complete. It is assumed that DTC 28
set as connector E-07 or F-29 was engaged
improperly.
STEP 4. Check the passenger's seat belt pre-tensioner.
(1) Disconnect the negative battery terminal.
(2) Disconnect the passenger's seat belt pretensioner
connector F-29.
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the harness connector by
backprobing.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC 28 set?
YES : Go to Step 5.
NO : Replace the passenger's seat belt pre-tensioner.
(Refer to
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
AC204127
AB
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
AC204127
AB
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
AC006042 AZ
MB991866
(RESISTOR HARNESS)
F-29 HARNESS
CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω
)
F-29 SEAT BELT
PRE-TENSIONER
CONNECTOR (PASSNGER'S SIDE)
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