1990 MITSUBISHI SPYDER ECU

SRS Troubleshooting
INSPECTION PROCEDURE FOR DIAGNOSTIC’
Code No. 14 Analog sensor system Probable cause,
[Comment]l
Malfunction of SRS-ECU
The SRS-ECU monitors the analog sensor output and outputs this code whenit detects a sensor failure, abnormal sensor charac teristics or abnormal sensor output.
Insulating tape
,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.
Code No. 15 or 16Safing sensor systemProbable
, l Malfunction of SRS-ECU
These codes are output when the resistance value be tween the safing
sensor
terminals in the SW-ECU is out of the normal range. Refer to the following table 1 for the trouble caus es of each code No.”
Table 1
Code No. Trouble Symptom
15Safing sensor short-circuited
16Safing sensor open-circuited. .
Insulating tapeICaution
Turn the ignition the position, disconnect
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 P.
Replace the SRS-ECU.
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SRS
Code No. or 62 Driver’s air bag module (squib) system
[Comment]These diagnostic trouble codes are output if there is abnormal resistance between the input terminals
of the driver’s air bag module (squib). Refer to the following table 1 for the trouble caus es of each code No.
Table 1
Probable cause
l Malfunction of l of harnesses orconnectorsl of bag
l of SRS-ECU
Code No. Trouble I
21
22
l Short in driver’s air bag module (squib) or harness short
l Short in clock spring
Open circuit in driver’s air bag module (squib) or open harness Open circuit in Malfunction of connector contact
61The harness wire of the driver’s air bag module (sq uib) is grounded to the power supply.
62The harness wire of the driver’s air bag module (sq uib) is grounded.
tape
Battery
cable
Caution
Turn the ignition key to the
position, disconnect
the negative battery cable and tape the
Wait at least 60 seconds after disconnecting the ba ttery
cable before doing any further work. (Refer to
check harnessSCAN TOOL DIAGNOSTIC
TROUBLE CODE
Disconnectclocksprlngconnector
Connect check harness
connector (1).
Erase diagnostic trouble codememory.
Are code Nos. or 62 output?
No
Clock spring check Repair
OK
Yes
the SRS-ECU and clock
Replace the SRS-ECU.
Replace the driver’s air bag module.
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8SRS Troubleshooting
Code No. or 65 Front passenger’s air bag module (squib)
systemProbable cause
[Comment]l o f o r
These diagnostic trouble codes are output if there is abnormal resistance between the input terminals l
of the front passenger’s air bag module (squib).
Refer to the following table 1 for the trouble caus es of each code No. air bag module (squib)
l Malfunction of SRS-ECU
Table
Code No. Trouble Symptom
24
25
64Short in front passenger’s air bag module (squib) o r harness short
l Open circuit in front passenger’s air bag module (s quib) or open harness
l Malfunction of connector contact
The harness wire of the front passenger’s air bag m odule (squib) is grounded to the power supply.
65The harness wire of the front passenger’s air bag m odule (squib) is grounded.I
Insulating tape
0 Battery
cable
check harness
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 ba ttery
cable before doing any further work. (Refer to P.
SCANTOOL DIAGNOSTIC
TROUBLE CODE
l Disconnect front passenger’s air
bag module connector
l Connect SRS check harness
connector (1).
l Erase diagnostic trouble code
memory.
Are code Nos. or 65 output?
Yes
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Replace the front passenger’s air bag module.
Check
Replace the SRS-ECU.

SRS Troubleshooting
Code No. 31 or 32 SRS-ECU capacitor systemProbable cause
[Comment]l Malfunction of These diagnostic trouble codes are output if the vo ltage at the SRS-ECU capacitor
terminals is higher (No. 31) or lower (No. 32) than the value for 5 seconds
or more.
However, if diagnostic trouble code Nos. 41 and 42 are being output due to a drop
in battery voltage, code No. 32 will not be detecte d.
Insulating tape
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 ba ttery
cable before doing any further work. (Refer to
Battery cable
Replace the SRS-ECU.
Code No. 34 Connector lock system Probable cause
[Comment]l Malfunction of connectors
This diagnostic trouble code is output when the SRS -ECU connector is connectedl
Malfunction of SRS-ECU
improperly.However, if the vehicle condition returns to normal , diagnostic trouble code No. 34
will be automatically erased, and the SRS light will switch off.
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 ba ttery
cable before doing any further work. (Refer to P.
Check trouble symptom.
OKNG
Repair
Replace the SRS-ECU.
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SRS Troubleshooting
Code No. 35 SRS-ECU (after deployment of the air bag)
systemP r o b a b l e
[Comment]l M a l f u n c t i o n o f S R S - E C U After deployment of the air bag, this code is outpu t.
If this code is output before
deployment of the air bag, a trouble in the SRS-ECU is suspected.
Insulating tape
Battery cable
Caution
Turn the ignition key to the “LOCK”
the negative battery cable and tape the
Wait at least 60 after disconnecting the battery
cable before doing any further
(Refer
Replace the SRS-ECU.
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Troubleshooting
Code No. 41 (A) power circuit systemP r o b a b l e
[Comment]l Malfunction of harnesses or connectors
This diagnostic trouble code is output if the volta ge between the (A) terminall
Malfunction of SRS-ECU,
and the ground is lower than the specified value fo r a continuous period of 5 secondsor more.
However, if the vehicle condition returns to normal , diagnostic trouble code No. 41
will be automatically erased, and the
light will switch off., .
Insulating tape
cable
I
Caution
Turn the ignition key to the “LOCK” position,
. the negative battery cable and tape terminal.
Wait at least 60 seconds after
battery
cable before doing any further work. (Refer P.
SRS check harness
OK
Measure at check harnessconnector (5).l Disconnect SRS-ECU connector
l Connect SRS check harness
connector (3).
lContinuity between terminals (20)
OK: Continuity
C h e c k t h efollowing
Check trouble symptom. .
N G
l Disconnect SRS-ECU connector l Connect check harness connector (3)
l Ignition switch: ON
l Voltage between terminal (14) and ground
OK: 9
or more
OK
Replace the SRS-ECU.
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SRS Troubleshooting
Code No. 42 (B) power circuit system Probable cause
[Comment]l Malfunction of harnesses or connectorsThis diagnostic trouble code is output if the voltage between the terminaland the ground is lower than the specified value fo r a continuous period of secondsor more.
However, if the vehicle condition returns to normal , diagnostic trouble code NO. 42
will be automatically erased, and the SRS warning l ight will switch off.
Battery
cableI
SRS check harness
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 P.
Measure at SRS check harness
connector (5). l Disconnect SRS-ECU connector
l Connect SRS check harness
connector (3).
lContinuity between (20)
OK: Continuity
0 0 0 0 3 9 2 4
OK
Measure at SRS check harness connector (5).
l Disconnect SRS-ECU connector
l Connect SRS check harness connector (3)
l Ignition switch: ON
l Voltage between terminal (13) and ground
OK:
or more
O K
I
the
OK
Check trouble symptom.
NG
NG C h e c k t h eNGfollowingconnectors: and
OK
ICheck trouble symptom.
NG
Repair
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SRS
Code No. 43 warning light drive circuit system
(Light does not illuminate.)
[Comment]This diagnostic trouble code is output when an open circuit occurs for a continuous
period of 5 seconds while the SRS-ECU is monitoring the SRS warning light and
the light is OFF (transistor OFF). However, if this code is output due to an open circ uit, if the vehicle condition returns
to
this diagnostic trouble code will be automatically erased, and the SRS light will switch off.
Battery
cable
SRS check harness
OK
Probable cause
of harnesses or connectors
l bulbl Malfunction of l Malfunction of combination meter
Caution
Turn the ignition key to the “LOCK”
the negative battery cable and tape the
Wait at least 60 seconds after disconnecting the ba ttery
cable before doing any further work. (Refer to
Measure at SRS check harness
connector (5). l Disconnect SRS-ECU connector
l Connect SRS check harness
connector (3).
l between terminals (20)
OK: Continuity
OK
[Check trouble symptom.
l Ignition switch: ON
l Connect terminal (15) to the body ground.
OK: Light illuminates
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