MITSUBISHI SPYDER 1990 Service Repair Manual

SRS Troubleshooting
Code No. 45 non-volatile memory (EEPROM)
and A/D converter system Probable cause
[Comment]l of SRS-ECUThis diagnostic trouble code is output if there is
a malfunction in the SRS-ECU tile memory (EEPROM) or converter.
tape
Battery cable
Caution
Turn the ignition key to the “LOCK” position, disco nnect
the negative ‘battery cable and tape the terminal.
Wait at
seconds after disconnecting the battery
cable before doing any further work. (Refer to P.
Replace the SRS-ECU.
I
Code or 52 Drivers’s air bag module (Squib
ianition drive circuit) svstem Probable cause
[Comment]l
Malfunction of SRS-ECUThese diagnostic trouble codes are output when a sh ort-circuit or open circuit occurs in the squib ignition circuit inside the SRS-ECU.
Insulating tape
Battery cable
Caution
Turn the ignition key to the “LOCK” position, disco nnect
the negative battery cable and tape the terminal.
Wait at least 60 seconds after disconnecting the battery
cable before doing any further work. (Refer to
Replace the
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SRS Troubleshooting
Code or 55 Front passenger’s air bag module
(Squib ignition drive
system Probable cause
[Comment]l
Malfunction of SRS-ECUThese diagnostic trouble codes are output when a sh ort-circuit or open circuit occurs in the squib ignition drive circuit inside the SRS-ECU.
Insulating tape
Battery cable
Caution
Turn the ignition key to the “LOCK” position, disco nnect
the negative battery cable and tape the terminal.
Wait at least 60 seconds after disconnecting the battery
cable before doing any further work. (Refer to
Replace the SRS-ECU.
lightwarning
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SRS WARNING LIGHT INSPECTION
1. Check that the warning ‘light
ignition switch is in the ON position.
2.Check that it illuminates for approximately 7 and
then switches off.
3.If the above is not the case, check the diagnostic trouble
codes.

SRS Troubleshooting
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Communication with scanCommunication with all systems is not possible.
tool is not possible. Communication is not possible with SRS only.
When the ignition key is turned to “ON” (engine sto pped), the SRS warning light
does not illuminate.
After the ignition switch is turned to ON, the SRS warning light is still on after
approximately 7 seconds have passed. Inspection
Procedure
Reference
,
1 .
2 ,
Refer to5 2 5 2 3
diagnostic
trouble code
Refer to
diagnostic
trouble code
No. 43.
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with scan tool is not possible.
(Communication with all systems is not possible) Probable cause
[Comment]l of connectors
The cause is probably in the power supply system (i ncluding ground circuit) of thel
Malfunction of harness
diagnostic line.
Refer to GROUP
Troubleshooting Engine (Non-turbo)>.
Refer to GROUP
Troubleshooting Engine (Turbo) and 2.4
INSPECTION PROCEDURE 2
Communication with scan tool is not possible.
(Communication is not possible with
only) Probable cause
[Comment]l
Malfunction of harnesses or connectors
If communication is not possible with the only, the cause is probably an open l
Malfunction of circuit in the on-board diagnostic output circuit o f the or in the power circuit(including ground circuit).
Insulating tapeCaution
Turn the ignition key to the “LOCK” position, disco nnect
the negative battery cable and tape the terminal.
Wait at least 60 seconds after disconnecting the ba ttery
cable before doing any further work. (Refer to

SRS Troubleshooting/Maintenance/Post-collision Diagnosis
SRS check harness 613).
0 0 0 0 3 8 2 4Measure at SRS check harness
connector (5). l Disconnect
connector
l Connect SRS check harness
connector (3)
l
Continuity between terminals (20)
OK: Continuity
Measure at SRS check harness connector (5).
l Disconnect SRS-ECU connector
l Connect check harness connector (3)
l Ignition switch: ON
l Voltage between the terminal (13) and ground
OK: 9
or more
l Voltage between the terminal (14) and ground
OK: 9
or more
Check trouble symptom.
NG
OK
Check the harness R e p a i r connector.
OK
Replace the SRS-ECU
MAINTENANCE
,
The SRS must be inspected by an Authorized
after the car manufacture date. to 00
Service.)
POST-COLLISION DIAGNOSIS
To inspect and service the after a collision
or not the air bags has deployed), perform the foll owing steps.
S R S A I R B A G C O N T R O L
MEMORY CHECK
1. Connect the scan tool to the data link connector .
Caution
Turn the ignition switch before or
connecting the scan tool.
Revision

SRS Post-collision Diagnosis
2. Read (and write down) all displayed diagnostic trouble
codes. (Refer to
NOTE
If the battery power supply has’ been disconnected or
disrupted by the collision, the scan tool cannot communi-
cate with the SRS-ECU.
and, ‘if necessary, repair
the body wiring harness before proceeding further.
3.Read the service data (fault duration and times
the memory was erased) using the Scan
NOTE
lMaximum stored period: 9999 minutes (approximately
7 days)
lMaximum number of times to be 250
4.Erase the diagnostic trouble codes, then wait 5 sec onds
or more, read and write down all displayed diagnost ic
trouble codes. (Refer to
REPAIR PROCEDURE
WHEN AIR BAG DEPLOYS IN A COLLISION.
1. Replace the following parts with new ones. l SRS air bag control unit (SRS-ECU) (Refer
l Air bag modules (Refer to
2.Check the following parts, and replace if any malfu nctions
are present.
l Clock spring (Refer to
l Steering wheel, steering column and intermediate
joint
(1) Check wiring harness (built, into’ steering whe el)
and connectors for damage, and terminals for
deformation.
(2) install air bag module to check fit or alignment
with steering wheel,.
(3) Check steering wheel for noise, binds or difficult
operation and excessive free play.
3. Check harnesses for binding, connectors for dama ge,
poor connections, and terminals for deformation.
(Refer to
WHEN AIR BAG DOES NOT IN LOW-SPEED
COLLISION.
Check the SRS components.
If the SRS components are showing any visible damag e such
as dents, cracks, or deformation, replace them with new ones.
Concerning parts removed for inspection, replacemen t
new parts and cautionary points for working, to
appropriate COMPONENT SERVICE,
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SRS Post-collision Diagnosis/Component Service
Air Bag Control Unit (SRS-ECU)
1. Check SRS-ECU case and brackets for dents, crack s
or deformation.
2. Check connector for damage, and terminals for
deformation.

0 0 0 0 0 0 5 4
side>Inflator case
Air Bag Module
1. Check pad cover for dents, cracks or deformation .
2. Check for connector damage, deformed terminal, a nd
binding harness.
3. Check air bag inflator case for dents, cracks or
deformation.
4.Install air bag module to steering wheel to check fit or
alignment with the wheel.

SRS Post-collision Diagnosis/Component Service
Protective tube
COMPONENT SERVICE
Clock Spring1. Check clock spring connectors and protective tub e for
damage, and terminals for deformation.
2. Visually check the case for damage.
Steering Wheel, Steering Column and Joint
1. Check wiring harness (built into steering wheel) and
connectors for damage, and terminals fordeformation.
2.Install air bag module to check fit or alignment with steering
wheel.
3.Check steering wheel for noise, binding, difficult operation,
or excessive free play.
Harness Connector (Body and Front Wiring Harness)
Check for binding harness, connector damage, poor
connections, and deformed terminals. (Refer to
52400290070
If the SRS components are to be removed or replaced as a result of maintenance, troubleshooting,
etc., follow each procedure. (SRS Air Bag Control U nit: refer to
Air Bag Modules and Clock
Spring: refer to
Caution
1.SRS components should not be subjected to heat over so remove SRS air bag
control unit, air bag modules 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 o f inspection, sheet metal repair, painting,
etc., they should be stored in a clean, dry place until they are reinstalled.
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SRS SRS Air Ban Control Unit (SRS-ECU)
SRS AIR BAG CONTROL UNIT (SRS-ECU) 52400210076
Caution
Never attempt to disassemble or repair the
SRS-ECU. If. faulty, replace it.
2.Do not drop or subject the SRS-ECU to
pact or vibration. If dents, cracking,
formation, or rust are discovered on the
SRS-ECU, replace it with a new SRS-ECU.
Discard the old one. 3. After deployment of
air, bags, replace
the
with, a
4.Never use an on or near
ECU, and use only the special test equip
ment described on
REMOVAL AND INSTALLATION
Operation
l Turn the ignition key to the “LOCK” position
Removal steps
l Post-installation inspection
1. Negative battery cable connec-
tion2. Inner box
3. SRS-ECU and harness connector
connection
4.5. Shift lever knob 6.Ashtray
7. Center console panel Floor console assembly9.Bracket
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SRS SRS Air BagControl Unit (SRS-ECU)
Insulating tape
Battery cable
REMOVAL SERVICE
NEGATIVE BATTERY CABLE
.
Disconnect the negative battery cable from the batt ery and
tape the terminal.
Caution
Wait at least 60 after disconnecting the battery
cable before any further work. (Refer to ,
INSTALLATION POINTS.
SRS-ECU INSTALLATION
Caution
The SRS may not activate SRS-ECU ‘is not
properly, which result in the SRS system not
ing properly in a collision.
POST-INSTALLATION INSPECTION
Reconnect the negative battery terminal. Turn the i gnition
key to the “ON” position. Does the warning light illumi-
nate for about 7 seconds, turn OFF and then remain OFF?
If yes, SRS system is functioning properly. If no, consult page
INSPECTION52400220045
Check the SRS-ECU case and brackets for dents, crac ks
or deformation.
Check connector for damage, and terminals for defor ma-
tion.
Caution
If a dent, cracks, deformation or rust is discovered,
replace the SRS-ECU with a new one.
of the SRS-ECU other than described above,
refer to the section troubleshooting.
to,
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SRS Air Bag Modules and Clock Spring
AIR BAG MODULES AND CLOCK SPRING52400240022
Caution
1.Never attempt to disassemble or repair the
air bag module or clock spring. If faulty,
replace it.
2. Do not drop the air bag module or clockspring or allow contact with water, grease
or oil. Replace it if a dent, cracks,
deformation or rust are detected.
3. The air bag modules should be stored on
a flat surface and placed so that the pad
surface is facing upward. Do not place anything on top of
bag
modules.
4.
Do not expose the air module to
temperature over
5.After deployment of an air bag, replace the
clock spring.
6. Wear gloves and safety goggles
handling an air bag that has
7.An undeployed air bag module should only
be disposed of in accordance with the
specified procedures. (Refer to
REMOVAL AND INSTALLATION
bag module (Driver’s side), Clock spring>
Operationl Set the steering wheel and the front wheels to
the straight ahead position, and then remove the
ignition key.
41
1. Negative battery cable l Post-installation inspection
2. Air bag module (Driver’s side) 1. Negative battery cable tion
3. Steering wheel
4. Column cover lower 2. Air bag module (Driver’s side)
5. Clock spring and body wiring har- l Pre-installation inspection
ness connection
6. Clock spring l Pre-installation inspection
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,
54
4
Clockspring removal steps
l Post-installation inspection Air bag module (Driver’s side)removal steps