battery MITSUBISHI 3000GT 1991 Service Manual

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-47
TEST 12REPAIR REQUIRED FOR “43. SRS LMP TRBL 1” FAULT(SRS warning light does not illuminate)
M'LTI-PUROSE
1
COMEIINATION METER(SRS WARNING LIGHT)1.4w x 205
SRS DIAGNOSIS UNI'
piw&pg ‘---pm
‘=lam-Ax-9150,-Y
SRS diagnosis unit
13R0704
View ATo front impact sensor
(L.H.)
\ ITo front impact sensor (R.H.)
T
Odlock spring
I19FOH0
To body wiring harness (14-pin)
(1)
IikPl s-a7 Lock leverTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
(2) Remove the rear console assemblv. (Refer to GROUP 52A
- Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.
-(4) Disconnect the red 14-pin connector from the SRS diagno-
sis unit while pressing down the lock of the connector.
(Refer to
P.52B-9.)
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52B-48 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting
MB991 349
SRS Check Harness
14-pin SDUconnector(red)
View ASRS Check Harness connector @
SRS
warning lightGround(5) Connect the now disconnected red harness-side SDU
connector
(14-pin) to the connector @ of the SRS Check
Harness.(6) Check according to the flow chart below, using the digital
’multi-meter.drI No
IIs there continuity between the No. 19or No. 20 terminal of SRS Check!--Ground circuit open
Harness connector
@ and ground?Yes
Reconnect negative terminal of
(()
No. 19 or 20 terminal (ground) and the
the SIX Check Harness connector @?Yes
)/ Malfunction of the SDU-1
(1) Turn the ignition key
to the “LOCK” po-
sition, disconnect
the negative battery
cable and tape the
terminal.
(2) After waiting at least30 seconds, replace
the bulbs, repair or
replace the body wir-
ing harness.(Refer toP.52B-14.)
(I ) Turn the ignition key
to the “LOCK” po-
sition, disconnect
the negative battery
cable and tape the
terminal.
(2) After waiting at least30 seconds, replace
the SDU. (Refer to
P.52B-59.)NOTE
- IMPORTANT
(1) After repairing the SRS, reconnect the battery cable, erase the diagnosis code memory from theMulti-use Tester and check the SRS warning light operation to verify the system functions
properly. (Refer to TEST 1.)
d(2) SDU
= SRS Diagnosis Unit
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Z~-%Z%&Z% 528-49Manufacture
date
IVEHICLE TYPE: PASSENGER CAR
MU9001/
OOFOOOlSRS
warnmq light- -SDU’
t>19FOlO:SRS MAINTENANCE AND
POST-COLLISION DIAGNOSIS
M52PCAAMAINTENANCE
The SRS must be inspected by an authorized dealer
10 years
after the car manufacture date shown on the certification label
located on left front door latch post.
Maintenance Items
1.“SRS” WARNING LIGHT CHECK
When the ignition key is turned to “ON” or engine started,
the “SRS” warning light will illuminate for about 7 seconds
and then turn off.
This means that the system is functioning properly.
2. SRS COMPONENTS VISUAL CHECK
(1) Turn the ignition key to the “LOCK” position, discon-
nect the negative battery cable and tape the terminal.
CautionWait at least 30 seconds after disconnecting the
battery cable before doing any further work. The
SRS system is designed to retain enough voltage todeploy the air bag for a short time even after the
battery has been disconnected, so serious injury
may result from unintended air bag deployment
if
work is done on the SRS system immediately afterthe battery cable is disconnected.
(2) Remove the rear console assembly. (Refer to GROUP
52A
- Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
CautionA double-lock mechanism is employed for the
connector of the SRS diagnosis unit, so care must
be taken not to damage it by using excessive forceor by not disconnecting it correctly.
(4) Disconnect the red
14-pin connector from the SRS
diagnosis unit while pressing down the lock of the
connector. (Refer to
P.52B-9.)
13R0721113R0722
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52B-54 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - ZZ%K%~g~~~s
POST-COLLISION DIAGNOSISTEST EQUIPMENT TO BE USED FOR POST-COLLISION DIAGNOSIS
ToolNumberName
Use
MB991 341Multi-use tester subassemblyl Reading diagnosis codesl Reading trouble periodl Erasing diagnosis codel Reading erase times
MB991 359
ROM pack (for Multi-
use Tester
Multi-usejesterR'OM pack(MB991341)(MB991 359)
Diagnosis/
service data
output
I
16LOO9'Function Selection
Data ListTo inspect and service the SRS after a collision (whether or not
the air bag has deployed), perform the following steps.
1. SRS Diagnosis Unit Memory Check
(1) Insert ROM pack into the Multi-use Tester and connect
the tester to Diagnosis Check Connector in glove
compartment.
‘I i(2) Read (and write down) all displayed diagnosis codes.J’(Refer to
P.52B-18.)
NOTEIf the battery power supply has been disconnected or
disrupted by the collision, the Multi-use Tester cannot
communicate with the SRS diagnosis unit. Inspect and,
if necessary, repair the body wiring harness before
proceeding further.
(3) Select the “2. SERVICE DATA” function and read (and
write down) all displayed “91. TRBL PERIOD” (Fault
duration) and “92. ERASE TIMES” (how many times
memories are erased.). Refer to Multi-use Tester
Instruction Manual (MB991 342).
NOTEl Maximum stored period: 9999 minutes (approx-
imately 7 days)
l Maximum number of times to be stored: 250
(4) Erase the diagnosis codes and after waiting 45 seconds
‘dor more read (and write down) all displayed diagnosis
codes. (Refer to P.528-18.)
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52B-56SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - front lwtact sensors
INDIVIDUAL COMPONENT SERVICEIf the SRS components are to be removed or replaced as a result of maintenance, troubleshooting, etc.,
follow each procedure
(P.52B-56 - P.52B-68).L++(
Caution
1.SW components should not be subjected to heat over 93°C (2OO”F), so remove the front impactsensors, SRS diagnosis unit and air bag module and clock spring before drying or baking the
vehicle after painting. Recheck SRS system operability after re-installing them.
2.If the SRS components are removed for the purpose of check, sheet metal repair, painting, etc.,they should be stored in a clean, dry place until they are reinstalled.
FRONT IMPACT SENSORS
Caution1. Never repair or disassemble a front impact
sensor. If faulty, replace it.
2.Handle the front impact sensors very careful-
ly, taking care not to drop them or otherwise
subject them to impact. If a sensor is seen tobe dented, cracked, deformed or rusted,
replace it with a new one.
3.Replace sensors with new ones after the air
bag has deployed.
REMOVAL AND INSTALLATION
Removal steps
l *Post-installation inspectiona*1. Connection of the negative (-) battery
cable to the battery
2. Front splash shield extension
I)* 3. Front impact sensorI)*Pre-installation inspection
I19FO133
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Front impact Sensors52B-57Digital multi-meter
/
19FOlC
SERVICE POINTS OF REMOVAL1. DISCONNECTION OF THE NEGATIVE
(-) BATTERY
CABLE FROM THE BATTERYTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
INSPECTION
(I) Check upper frame and sensor brackets for deformities or
rust.
(2) Check sensor harness for binds, connectors for damage,
and terminals for deformities.
(3) Check for dents, cracks or deformation of the front impact
sensor.
Caution
If a dent, crack, deformation or rust is detected, replacewith a
.new sensor.
(4) Remove the front impact sensor.
(5) Measure the resistance between terminals and check
whether it is within the standard value.
Standard value: 2,000 + 40
iZ
CautionAlways replace the sensor with a new one if the
resistance is not within the standard value.
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52B-58SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Front Impact Sensors
SERVICE POINT OF INSTALLATION
PRE-INSTALLATION INSPECTION
(1) Before any front impact sensor is installed in the vehicle, it
must be visually inspected. If a dent, crack or other
LAdeformation, or rust, is detected, discard the sensor and
replace it with a new one that passes the visual inspection.
(2) Before any front impact sensor is installed in the vehicle,
the resistance between its terminals must be confirmed to
be within the standard value.
Standard value: 2,000
-t 400
Use the digital multi meter. If the resistance is not within
that standard value range, discard it and replace it with a
new one that has the standard value.
19FOO6i4.
INSTALLATI’ON OF FRONT IMPACT SENSOR
(1) Bend the wiring harness slightly (to the extent that
there is no slack), and clip securely by using the clip of
the front impact sensor.
(2) Install the front impact sensor so that there is close
adherence of the upper surface of the front impact
sensor and the installation surface of the upper frame
d’(lower).
Caution
The SRS may not activate properly if a front impact
sensor is not installed properly, which could result
Iin serious injury or death to the vehicle’s driver.
POST-INSTALLATION INSPECTIONReconnect the negative battery terminal. Turn the ignition
switch to “ON”. Does the
“SW” warning light illuminate for
about 7 seconds, turn OFF and then remain extinguished for at
least 45 seconds? If yes, SRS system is functioning properly. If
no, consult page 52B-17.
19FOO72
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)- SRS Diagnosis Unit (SDU) 52B-59
SRS DIAGNOSIS UNIT (SDU)M52PDBA
Caution1. Never attempt to disassemble or repair the
SRS diagnosis unit. If faulty, replace it.
2.Do not to drop or subject the SRS diagnosisunit to impact or vibration.
If denting, cracking, deformation, or rust are
discovered in the SRS diagnosis unit, replace
it with a new SRS diagnosis unit. Discard theold one.3. After deployment of an air bag, replace the
SRS diagnosis unit with a new one.
4.Never use an ohmmeter on or near the SRS
diagnosis unit, and use only the special testequipment described on
P.!i2B-16.
REMOVAL AND INSTALLATION
Removal steps
*aPost-installation inspectionaI)1. Connection of the negative
battery cable to the battery
2. Cup holder
19FO130
t-1
3. Console plug
4. Rear console assembly
a* l d5. Connection of the SRS diagnosis
unit and each harness connector
l *6. SRS diagnosis unit*cPre-installation inspection
2-pin yellow connector
to left front impact sensor
Z-pin red
tonneto clock sprrng
Z-pin dlueconnector
to right front
\Impact sensor14-pin red connector to body wlnng harness
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52B-60 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - SRS Diagnosis Unit (SW
0I/-Battery e
13R0721lSF1072:
SRS diagnosis unitView A13R0704
To front impact sensor
(L.H.)
\To front impact sensor (R.H.1\I
I- - -,I1
\To clock springTo body wiring harness (14-pin)19FOllt
r-TSB I
SERVICE POINTS OF REMOVAL1. DISCONNECTION OF THE NEGATIVE
(-) BATTERY
CABLE FROM THE BATTERYTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.5. DISCONNECTION OF THE SRS DIAGNOSIS UNIT AND
EACH HARNESS CONNECTOR(1) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
CautionA double-lock mechanism is employed for the
connector of the SRS diagnosis unit, so care mustbe taken not to damage the connector by using
excessive force or by not disconnecting it correctly.(2) Remove each connector from the SRS diagnosis unit
while pressing down the lock of each connector. (Refer
to
P.52B-9.)
INSPECTIONlCheck the SRS diagnosis unit case and brackets for dents,
cracks or deformities.
lCheck connectors and lock lever for damage, and terminals
for deformities.
CautionIf a dent, cracks, deformation or rust discovered,
replace the SRS diagnosis unit with a new one.
NOTEFor checking of the SRS diagnosis unit other than described
above, refer to the section concerning troubleshooting.
(Refer to
P.52B-17.)
Revision
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) -SRS Diagnosis Unit (SDU) 52B-611330721
13R072i
ht-----
SERVICE POINTS OF INSTALLATION
PRE-INSTALLATION INSPECTIONBefore SRS diagnosis unit is installed in the vehicle, it must be
visually inspected. If a dent, crack or other deformation is
detected, discard the SRS diagnosis unit and replace it with a
new one that passes the visual inspection.
6. INSTALLATION OF SRS DIAGNOSIS UNIT
With the projection part of the SRS diagnosis unit placed
against the bracket as shown in the figure, securely install
the SRS diagnosis unit.
CautionThe SRS may not activate properly if SRS diagnosis
unit is not installed properly, which could result in
serious injury or death to the vehicle’s driver.
5. CONNECTION OF THE SRS DIAGNOSIS UNIT AND
EACH HARNESS CONNECTORAfter connecting each harness connector securely and
correctly to the SRS diagnosis unit, be sure to press down
the lock lever of the SRS diagnosis unit.
POST INSTALLATION INSPECTION
Reconnect the negative battery terminal. Turn the ignition
switch to “ON”. Does the “SRS” warning light illuminate for
about 7 seconds, turn OFF and then remain extinguished for at
least 45 seconds? If yes, SRS system is functioning properly. If
no, consult page
52B-17.
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