Mitsubishi Montero (2004+). Manual — part 1173
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-27
.
CIRCUIT OPERATION
• When the left and right front impact sensors
detect a collision, the switches inside the sensors
turn ON.
• SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors
and the front air bag analog G-sensor. If the
impact is over a predetermined level, the
SRS-ECU sends an ignition signal. At this time, if
the front air bag safing G-sensor is on, the SRS
air bag will inflate.
.
DTC SET CONDITIONS
These DTCs are set if there is abnormal resistance
between the input terminals of the front impact sen-
sors.
The most likely causes for these codes to be set are
shown in the table below:
.
TROUBLESHOOTING HINTS
• Damaged harness wires and connectors
• Front impact sensor failed
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991222: Probe
• 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 (Vehicles without
CAN communication system)
AC204230
CONNECTOR : D-28
AB
D-28
ACX01478 AG
CONNECTOR: E-08
E-08 (Y)
DTC
SYMPTOM
1A
• Left front impact sensor or its wiring shorted
1B
• Left front impact sensor or wiring open circuit
1C
• Short to the power supply in the left front impact sensor harness
1D
• Short to body ground in the left front impact sensor harness
2A
• Right front impact sensor or its wiring shorted
2B
• Right front impact sensor or wiring open circuit
2C
• Short to the power supply in the right front impact sensor harness
2D
• Short to body ground in the right front impact sensor harness
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-28
Step 1. Check the front impact sensor.
Refer to
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Replace the front impact sensor (Refer to
Step 2. Measure the resistance and voltage at SRS-ECU
connector E-08.
(1) Disconnect SRS-ECU connector E-08.
ACX01478AM
CONNECTOR: E-08
E-08 (Y)
HARNESS SIDE
CONNECTOR
(REAR VIEW)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-29
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(2) Take the measurements below at harness-side connector
E-08.
• Resistance between terminals 1 and 2, and between 3
and 4.
NG: 2 ohms or less (short circuit) or 2 megohms or
more (open circuit)
• Continuity between terminals 1, 2, 3, 4 and body ground
OK: No continuity
• Voltage between terminals 1, 2, 3, 4 and body ground
OK: 0V
Q: Is the check result satisfactory?
YES : Go to Step 4.
NO : Go to Step 3.
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AC204768AC
E-08 HARNESS SIDE
CONNECTOR
(REAR VIEW)
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AC204767AC
E-08 HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC103372
4
1
2
3
5
7
6
8
16
15
14
13
12
11
10
9
20
19
18
17
AE
4
1
2
3
5
7
6
8
16
15
14
13
12
11
10
9
20
19
18
17
AC210613
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-30
Step 3. Check the wiring harness between the right front
impact sensor connector A-30 (terminal No.1 and 2) and
SRS-ECU connector E-08 (terminal No.1 and 2) as well as
between left front impact sensor connector A-23 (terminal
No.1 and 2) and SRS-ECU connector E-08 (terminal No.3
and 4).
AC204228
CONNECTOR: A-30
AD
A-30 (Y)
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2
1
ACX01478AM
CONNECTOR: E-08
E-08 (Y)
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC204229
CONNECTOR: A-23
AD
A-23 (Y)
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2
1
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