Mitsubishi Lancer Evolution-VII Workshop Manual page 144

INTERIOR –
SRS-ECU
The SRS-ECU incorporates an analog G sensor
and safing G sensor for frontal collisions.
In frontal collisions, the driver's and front passen-
ger's air bags deploy only when both the analog
and safing G sensors detect simultaneously a colli-
sion-induced G of a level exceeding the threshold
as in the case with the conventional system.
Like the conventional system, the SRS-ECU is pro-
vided with the following capabilities:
DIAGNOSIS FUNCTION
The SRS-ECU has the following functions to make
system checking using MUT-II easy.
Diagnosis code output
D
DIAGNOSIS CODE OUTPUT
The SRS-ECU diagnoses the following items and
stores a diagnosis code in the non-volatile memory
1
(EEPROM* ) when a problem is detected.
Code
Major Contents of Diagnosis
No.
14 Frontal collision analog G sensor failure
15 Frontal collision safing G sensor short-circuited
16 Frontal collision safing G sensor open-circuited
3
21* Driver's side front air bag squib short-circuited
3
22* Driver's side front air bag squib open-circuited
3
24* Front passenger's side front air bag squib short-circuited
3
25* Front passenger's side front air bag squib open-circuited
3
26* Driver's side front seat belt pretensioner short-circuited
3
27* Driver's side front seat belt pretensioner open-circuited
3
28* Front passenger's side front seat belt pretensioner short-circuited
3
29* Front passenger's side front seat belt pretensioner open-circuited
31 Capacitor voltage rises
32 Capacitor voltage drops
2
34* Connector locking mechanism malfunction
35 Ignition of the air bag completed
2
41* Power supply voltage (IG1 voltage) drops abnormally.
2
42* Power supply voltage (IG1 voltage) drops abnormally.
2
43* SRS warning lamp circuit open-circuited
2
44* Defective SRS warning lamp circuit
45 Defective SRS-ECU
49 Air bag fully deployed
51 Driver's side front air bag squib activating circuit short-circuited
Supplemental Restraint System (SRS)
Backup power supply in case of power failure
D
in collisions
Boosting function in case of battery voltage
D
drop
Self-diagnosis function to avoid system's opera-
D
tion errors and improve its reliability
Caution
Never disassemble the SRS-ECU. And never
subject it to impact.
Service data output
D
Therefore, the memory is not deleted after a battery
terminal is disconnected. (The diagnosis code
memory can be deleted by the MUT-II.)
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