Mitsubishi Galant. Manual — part 594
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
52B-17
SR S A IR B A G D IA G N O SIS
INTRODUCTION TO DIAGNOSIS
M1524005000084
The SRS system is controlled by the SRS-ECU. The
SRS-ECU judges how severe a collision is by
detecting signals from the analog G-sensor. If the
impact is over a predetermined level, the SRS-ECU
outputs an ignition signal. At this time, if the safing G-
sensor is on, the SRS air bag will inflate. The SRS
warning light in the combination meter alerts a
malfunction of the SRS system. If the following
symptoms occur even when the vehicle has not
collided, there may be a malfunction.
•
The SRS warning light does not go off within
approximately 7 seconds after the ignition switch
has been turned "ON".
•
The SRS warning light does not illuminate when
the ignition switch is turned "ON".
Refer to the Post-collision Diagnosis when inspecting
and servicing the vehicle that has been in a collision
(Refer to
TROUBLESHOOTING STRATEGY
M1524003100085
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted all of the possible ways to find a
SRS fault.
1. Gather information about the problem from the
customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any SRS DTC.
4. If you cannot verify the condition but there are no
SRS DTCs, the malfunction is intermittent. Refer
to INTRODUCTION, How to use
Troubleshoothing
−
Inspection Service Points
−
How to Cope With Intermittent Malfunctions.
5. If there is a SRS DTC, record the code number,
then erase the code from vehicle memory using
scan tool MB991502.
6. Recreate the SRS DTC set conditions to see if the
same SRS DTC will set again.
•
If the same SRS DTC sets again, follow the
Inspection Chart for DTC and find the fault.
•
If you cannot get the same SRS DTC to set
again, the malfunction is intermittent. Refer to
GROUP 00, How to use Troubleshoothing
−
Inspection Service Points
−
How to Cope With
Intermittent Malfunctions.
SRS DTC DIAGNOSIS
M1524003200082
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
RETRIEVING SRS DTC
Connect scan tool MB991502 to the data link connector, and
then check DTC.
ERASING SRS DTC
Connect scan tool MB991502 to the data link connector, and
then erase the DTC.
AC003194AB
16 PIN
MB991502
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
52B-18
DTC CHART
M1524003300120
Inspect according to the inspection chart that is appropriate for the DTC.
CODE NO.
ON-BOARD DIAGNOSTIC ITEM
REFERENCE PAGE
14
Analog G-sensor system in the SRS-ECU
15
Safing G-sensor short circuit
16
Safing G-sensor open circuit
17
Safing G-sensor for side air bag faults
21*
2
Driver's side air bag module (squib) system fault 1
22*
2
Driver's side air bag module (squib) system fault 2
24*
2
Front passenger's side air bag module (squib) system fault 1
25*
2
Front passenger's side air bag module (squib) system fault 2
31
SRS-ECU capacitor circuit voltage too high
32
SRS-ECU capacitor circuit voltage too low
34*
1
Connector lock system detects connector unlocked
35
SRS-ECU air bag condition monitor detects deployed air
bag
41*
1
IG1 power circuit system (fuse No.13 circuit)
42*
1
IG1 power circuit system (fuse No.5 circuit)
43
SRS warning light drive circuit
system fault 1
Light does not illuminate*
1
Light does not switch off
44*
1
SRS warning light drive circuit system fault 2
45
SRS-ECU non-volatile memory (EEPROM) and A/D
converter system
51
Driver's side air bag module (squib ignition drive circuit)
system detected short circuit
52
Driver's side air bag module (squib ignition drive circuit) sys-
tem detected open circuit
54
Front passenger's side air bag module (squib ignition drive
circuit) system detected short circuit
55
Passenger (front)-side air bag module (squib ignition drive
circuit) system detected short circuit
61
Driver's side air bag module (squib) system fault for power
supply circuit
62
Driver's side air bag module (squib) system fault for ground
circuit
64
Passenger (front) side-air bag module (squib) system fault
for power supply circuit
65
Passenger (front) side-air bag module (squib) system fault
for ground circuit
71*
2
Right hand side-air bag module (squib) system fault 1
72*
2
Right hand side-air bag module (squib) system fault 2
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
52B-19
NOTE:
.
1. *1: If the vehicle condition returns to normal, the DTC will be automatically erased, and the SRS warning
light will return to normal.
2. *2: However, if no DTC resets, the SRS warning light will be switched off (The DTC will be retained).
3. If the vehicle has a discharged battery, it will store the DTC 41 or 42. When these DTC are read, check the
battery.
73
Right hand side-air bag module (squib) system detected
short circuit
74
Right hand side-air bag module (squib) system detected
open circuit
75
Right hand side-air bag module (squib) system fault power
supply circuit
76
Right hand side-air bag module (squib) system fault ground
circuit
79
Left hand side-air bag module (squib) system fault 5 for
power supply circuit
81*
2
Left hand side-air bag module (squib) system fault 1
82*
2
Left hand side-air bag module (squib) system fault 2
83
Left hand side-air bag module (squib) system fault 3 for igni-
tion drive circuit
84
Left hand side-air bag module (squib) system fault 4 for igni-
tion drive circuit
85
Left hand side-air bag module (squib) system fault power
supply circuit
86
Left hand side-air bag module (squib) system fault ground
circuit
89
Right hand side-air bag module (squib) system fault 5 for
power supply circuit
91*
1
Left hand side-impact sensor power supply circuit system
92
Left hand side-impact sensor system for fault 1
93
Left hand side-air bag module (squib) system fault 6 for
communication system
94*
1
Right hand side-impact sensor power supply circuit system
95
Right hand side-impact sensor system for fault 1
96
Right hand side-air bag module (squib) system fault 6 for
communication system
CODE NO.
ON-BOARD DIAGNOSTIC ITEM
REFERENCE PAGE
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
52B-20
SYMPTOM CHART
M1524003400127
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC 14: Analog G-sensor system in the SRS-ECU
DTC 15: Safing G-sensor short circuit
DTC 16: Safing G-sensor open circuit
DTC 17: Safing G-sensor for side air bag faults
DTC 31: SRS-ECU capacitor circuit voltage too high
DTC 32: SRS-ECU capacitor circuit voltage too low
DTC 45: SRS-ECU non-volatile memory (EEPROM) and A/D converter system
DTC 51: Driver's side air bag module (squib ignition drive circuit) system detected short circuit
DTC 52: Driver's side air bag module (squib ignition drive circuit) system detected open circuit
DTC 54: Passenger (front)-side air bag module (squib ignition drive circuit) system detected short
circuit
DTC 55: Passenger (front)-side air bag module (squib ignition drive circuit) system detected open
circuit
DTC 73: Right hand side-air bag module (squib) sytem detected short circuit
DTC 74: RIght hand side-air bag module (squib) sytem detected open circuit
DTC 83: Left hand side-air bag module (squib) system fault 3 for ignition drive circuit
DTC 84: Left hand side-air bag module (squib) system fault 4 for ignition drive circuit
DTC SET CONDITIONS
•
These DTC are output when a fault is detected in
the SRS-ECU. The most likely causes for this
code to be set are shown in the table below:
TROUBLESHOOTING HINTS
•
Malfunction of the SRS-ECU
SYMPTOMS
INSPECTION PROCEDURE NO. REFERENCE PAGE
Communication with scan tool MB991502 is not
possible (Communication with all systems is not
possible).
1
GROUP 13A,
DIAGNOSIS
GROUP 13B,
DIAGNOSIS
Communication with scan tool MB991502 is not
possible (Communication is not possible with
SRS only).
2
When the ignition switch is turned to "ON"
(engine stopped), the SRS warning light does
not illuminate.
Refer to DTC No.43.
After the ignition switch is turned to "ON," the
SRS warning light does not go off within
approximately 7 seconds.
Refer to DTC No.43.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст