Mitsubishi Lancer Evolution VI. Manual — part 90
SRS –
Troubleshooting
52B-6
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION
DIAGNOSIS CODES CHECK
Connect the MUT-
II
to the diagnosis connector (16-pin) under the instrument under cover, then check
diagnosis codes.
(Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
Connect the MUT-
II
to the diagnosis connector and erase the diagnosis code.
Caution
Turn off the ignition switch before connecting or disconnecting the MUT-
II
.
INSPECTION CHART FOR DIAGNOSIS CODES
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No.
Diagnosis item
Reference page
14
Analog G-sensor system in the SRS-ECU
52B-7
15,16
Safing G-sensor system in the SRS-ECU
52B-7
21, 22, 61, 62
Driver’s side air bag module (squib) system
52B-8
24, 25, 64, 65
Front passenger’s side air bag module (squib) system
52B-9
31, 32
SRS-ECU capacitor system
52B-9
34*
Connector lock system
52B-10
35
SRS-ECU (deployed air bag) system
52B-10
41*
IG
1
(A) power circuit system
52B-10
42*
IG
1
(B) power circuit system
52B-11
43
SRS warning lamp drive circuit
system
Lamp does not illuminate.*
52B-12
system
Lamp does not switch off.
52B-12
44
SRS warning lamp drive circuit system
52B-13
45
SRS-ECU non-volatile memory (EEPROM) and A/D converter system
52B-13
51, 52
Driver’s side air bag module (squib ignition drive circuit) system
52B-13
54, 55
Front passenger’s side air bag module (squib ignition drive circuit) system
52B-13
NOTE
(1) *: If the vehicle condition returns to normal, the diagnosis code will be automatically erased, and the SRS warning
lamp will return to normal.
(2) If the vehicle has a discharged battery it will store the fault codes 41 or 42. When these diagnosis codes are
displayed, check the battery.
SRS –
Troubleshooting
52B-7
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.14 Analog G-sensor system in the SRS-ECU
Probable cause
The SRS-ECU monitors the output of the analog G-sensor inside the SRS-ECU.
It outputs this code when any of the following are detected.
D
When the analog G-sensor is not operating
D
When the characteristics of the analog G-sensor are abnormal
D
When the output from the analog G-sensor is abnormal
D
Malfunction of SRS-ECU
Replace the SRS-ECU.
Code No.15, 16 Safing G-sensor system in the SRS-ECU
Probable cause
This code is output if there is a short or open circuit between the terminals of the
safing G-sensor inside the SRS-ECU.
The trouble causes for each diagnosis code No. are as follows.
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
15
Short circuit in the safing G-sensor
16
Open circuit in the safing G-sensor
Replace the SRS-ECU.
SRS –
Troubleshooting
52B-8
Code No.21, 22, 61 or 62 Driver’s side air bag module
(squib) system
Probable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the driver’s side air bag module (squib).
The trouble causes for each diagnosis code No. are as follows.
D
Malfunction of clock spring
D
Partial disconnection due to incorrect clock spring
neutral position
D
Malfunction of wiring harnesses or connectors
D
Malfunction of driver’s side air bag module (squib)
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
21
D
Short in driver’s side air bag module (squib) or harness short
D
Short in clock spring
D
Malfunction of connector*
22
D
Open circuit in driver’s side air bag module (squib) or open harness
D
Open circuit in clock spring
D
Malfunction of connector contact
61
D
Short in driver’s side air bag module (squib) harness leading to the power supply
62
D
Short in driver’s side air bag module (squib) harness leading to the earth
NOTE
*:
The connector in the squib circuit has a built-in short bar which short-circuits between plus (+) lead and minus
(–) lead of the squib circuit when the connector is not being connected to prevent an accidental air bag deployment
possibly caused by static electricity, etc. Therefore, malfunction of the connector can also be caused by this
short bar which fails to be released even when the connector is reconnected if it is damaged.
MUT-
II
Self-diag code
D
Disconnect clock spring
connector B-82.
D
Connect SRS check har-
ness connector (1).
D
Erase diagnosis code
memory.
Are code Nos.21, 22, 61 or
62 output?
Yes
Check the following
connectors:
B-82, B-51
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire
between the SRS-ECU
and clock spring.
NG
Repair
OK
Replace the SRS-ECU.
No
Check the clock spring. (Refer to P.52B-30.)
NG
Repair
OK
Replace the driver’s side air bag module.
SRS check harness
(MB991613)
Body wiring
harness
Clock spring
1
SRS –
Troubleshooting
52B-9
Code No.24, 25, 64 or 65 Front passenger’s side air bag
module (squib) system
Probable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the driver’s side air bag module (squib).
The trouble causes for each diagnosis code No. are as follows.
D
Malfunction of wiring harnesses or connectors
D
Malfunction of front passenger’s side air bag module
(squib)
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
24
D
Short in front passenger’s side air bag module (squib) or harness short
D
Malfunction of connector*
25
D
Open circuit in front passenger’s side air bag module (squib) or open harness
D
Malfunction of connector contact
64
D
Short in front passenger’s side air bag module (squib) harness leading to the power
supply
65
D
Short in front passenger’s side air bag module (squib) harness leading to the earth
NOTE
*:
The connector in the squib circuit has a built-in short bar which short-circuits between plus (+) lead and minus
(–) lead of the squib circuit when the connector is not being connected to prevent an accidental air bag deployment
possibly caused by static electricity, etc. Therefore, malfunction of the connector can also be caused by this
short bar which fails to be released even when the connector is reconnected if it is damaged.
OK
Check trouble symptoms.
NG
Check the harness wire
between the front passen-
ger’s side air bag module
(squib) and SRS-ECU.
NG
Repair
OK
Replace the SRS-ECU.
Yes
Check the following
connectors:
B-01, B-51
NG
Repair
SRS check harness
(MB991613)
Body
wiring
harness
1
No
Replace the front passenger’s side air bag module.
MUT-
II
Self-diag code
D
Disconnect front
passenger’s side air bag
module connector B-01.
D
Connect SRS check
harness connector (1).
D
Erase diagnosis code
memory.
Are code Nos.24, 25, 64 or 65
output?
Code No.31 or 32 SRS-ECU capacitor system
Probable cause
Probable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the driver’s side air bag module (squib).
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
31
D
Voltage at the capacitor terminal is higher than the specified value for five seconds
or more
32
D
Voltage at the capacitor terminal is lower than the specified value for five seconds
or more (this is not detected if diagnosis code No.41 or 42 indicating system voltage
drop has been output.)
Replace the SRS-ECU.
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