2007 MITSUBISHI LANCER EVOLUTION ignition

SRS -Troubleshooting52B-11
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.14, 15, 16, 31, 32, 45, 51, 52, 54, 55, 56, 57, 58, 59
System inside SRS-ECUProbable cause
Malfunction is present inside SRS-ECU. See table below for what each code
tells.DMalfunction of SRS-ECU
Code No.Defective partsTrouble
14Front impact analog G-sensorDNot operating
DAbnormal characteristics
DAbnormal output
15Front impact safing G-sensorDShort in the circuit
16DOpen in the circuit
31DC-DC converterDTerminal voltage of the converter higher than specified for
five seconds or more
32DTerminal voltage of the converter lower than specified for
5 seconds or more (this code is not detected when code
No.41 or 42, which indicates discharged battery, has been
detected)
45Non-volatile memory (EEPROM)DDefective parts inside
51Driver’sairbagmodule(squib)DShortinthecircuit51Driver’sairbag module(squib)
ignitiondrivecircuit
DShortinthecircuit
52ignition drive circuitDOpen in the circuit
54Front passenger’s air bag module
(squib)ignitiondrivecircuit
DShort in the circuit
55(squib)ignitiondrive circuitDOpen in the circuit
56Driver’s seat belt pre-tensioner
(squib)ignitiondrivecircuit
DShort in the circuit
57(squib)ignitiondrive circuitDOpen in the circuit
58Front passenger’s seat belt pre-ten-
sioner(squib)ignitiondrivecircuit
DShort in the circuit
59sioner(squib)ignitiondrive circuitDOpen in the circuit
If the above - mentioned code No. is output, replace the SRS-ECU.

SRS -Troubleshooting52B-30
Code No.41 Power supply circuit system (fuse No.2
circuit)Possible Cause
This codes output when the voltage between terminal IG1(SRS-ECU, terminal
No.16) and earth has been below the standard value for 5 seconds.
However, code No.41 is automatically erased and SRS warning lamp goes out
when a normal operation is resumed. If code No.41 and 42 are output at the
same time, check the battery first since the battery voltage may have decreased.DHarness or connector fault
DSRS-ECU inoperable
block and the combination meter>
Measure at the junction block connector
C-213.
DDisconnect the junction block connector
C-213 and measure at the harness
side.
DContinuity check between terminal 25
and body earth
Caution
Do not directly insert a probe or
other devices at the front of the
connector to avoid a possible
decrease in the contact pressure.
OK:No continuity
block>
Measure at the junction block connector C-213.
DDisconnect the junction block connector C-213 and
measure at the harness side.
DContinuity check between terminal 24 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:No continuity
NGCorrect the harness between the junction block and
combination meter (SRS warning lamp).
NGOK
NGNG
Check the trouble symptoms.Correct
Check the harness between the SRS-ECU and the ignition
switch IG
1, and repair if necessary. Fuse is normal
NG
Fuse disconnection
Check the junction block general fuse No.2.
Fuse disconnection
Check when fuse disconnects
DReplace the fuse.
DTurn the ignition switch to the ON position and then turn it
to the OFF position after one minute or more has passed.
Check the fuse.
OK
OK
Replace the SRS-ECU.
>Measure at the SRS-ECU connector C - 21.
DDisconnect the SRS-ECU connector C-21.
DConnect the negative ( - ) terminal of the battery
DIgnition switch: ON
DMeasure at the harness side
DVoltage between terminal 16 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:9 V or more
Check the other circuits using the general fuse No.2.
(See the Electrical Wiring Diagram.) OK
Check connector:C-21, C-213, C-210
Go to Next PageConnector C-21
Connector C-213
Connector C-213

SRS -Troubleshooting52B-32
Code No.42 Power supply circuit system (fuse No.3
circuit)Possible Cause
This code is output when the voltage between terminal IG1(SRS-ECU, terminal
No.13) and earth has been below the standard value for 5 seconds.
However, code No.42 is automatically erased and SRS warning lamp goes out
when a normal operation is resumed.If code No.41 and 42 are output at the
same time, check the battery first since the battery voltage may have decreased.DHarness or connector fault
DSRS-ECU inoperable
OK
Check the other circuits using the general
fuse No.3. (See the Electrical Wiring
Diagram.)
NGOK
NG
NG
NG
Check connector:C-21, C-213, C-210
Check the trouble
symptoms.Correct
Check the harness between the SRS-ECU and the ignition
switch IG
1, and repair if necessary.
NG
Fuse disconnection
Fuse disconnection
OK
Replace the SRS-ECU.
switch IG
1
>Measure at the SRS-ECU connector C - 21.
DDisconnect the SRS-ECU connector C-21 and measure at
the harness side.
DConnect the negative ( - ) terminal of the battery
DIgnition switch: ON
DVoltage between terminal 13 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:9 V or more
OK
Check the harness between the SRS-ECU and junction block,
and repair if necessary. block>
Measure at the C-21 SRS-ECU connector.
DDisconnect the SRS-ECU connector C-21 and measure at
the harness side.
DContinuity check between terminal 13 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:No continuity
Replace the SRS-ECU.Fuse is normal
Check the junction block general fuse No.3.
Check when fuse disconnects
DReplace the fuse.
DTurn the ignition switch to the ON position and then turn it
to the OFF position after one minute or more has passed.
Check the fuse.
block>
Measure at the junction block connector C-213.
DDisconnect the junction block connector C-213 and
measure at the harness side.
DContinuity check between terminal 7 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:No continuityConnector C-21
Connector C-213
Connector C-21

SRS -Troubleshooting52B-33
Code No.43 SRS warning lamp drive circuit system (lamp
does not illuminate)Possible Cause
This code is output when open circuit has occurred in the SRS warning lamp
drive circuit for 5 seconds or more. However, if the code is output due to open
circuit faulty, code No.43 is automatically erased and the SRS warning lamp
functions normally as soon as a normal operation is resumed.DHarness or connector fault
DBulb fault
DSRS-ECU inoperable
DCombination meter fault
NGNG
NGOK
NG
NGOK
Check the trouble symptoms.
NG
Correct
Check the harness between the SRS-ECU, the combination
meter, and the ignition switch IG1.
OK
Replace the SRS-ECU.Correct
Correct
OK
Check connector:C-21, C-213, C-29, C-01, C-02
Check the SRS warning lamp.
DConnect the negative ( - ) terminal of the battery
DIgnition switch: ON
DDoes the lamp illuminate when the SRS-ECU connector C-21 is
disconnected?
OK:Lamp illuminates.Check the bulb.
Replace the combination meter. OK
CorrectCheck the harness between the SRS-ECU and the
ignition switch IG
1.
Code No.43 SRS warning lamp drive circuit system
(Lamp does not go out)Probable cause
Harness between SRS warning lamp and SRS-ECU is being shorted to earth
However, once trouble is extinguished, this code will be automatically erased,
and SRS warning lamp will go out.DHarnesses or connector fault
DSRS-ECU inoperable
DCombination meter fault
NO
OKNG
NG
NG
Replace combination meter.
Check the SRS warning lamp.
DConnect negative (–) battery
terminal.
DIgnition switch: ON
DDoes lamp go out when
combination meter connector
C-02 is disconnected?YESCheck the following connectors:C-02,
C-21
Check trouble symptoms.
OK
Replace the SRS-ECU.
Check the wiring harness between
SRS-ECU and combination meter
.
Repair
Repair NG
Code No.44 SRS warning lamp drive circuit systemProbable cause
Short is present in SRS warning lamp drive circuit, or output transistor in
SRS-ECU is defective.
However, once trouble is extinguished, this code will be automatically erased,
and SRS warning lamp will go out.DHarnesses or connector fault
DSRS-ECU inoperable
Check the SRS warning lamp drive circuit system.
(Refer to P.52B-33.)OKReplace the SRS-ECU.

SRS -Troubleshooting52B-35

clock spring>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the the clock spring connector
C-204.
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 11 or 12 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V clock spring>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the clock spring connector C-204 .
DMeasure at the harness side
DContinuity between terminal 11 or 12 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to avoid
a possible decrease in the contact pressure.
OK:No continuity

MUT-II self-diag code
DRelease the clock spring connector (2 - pin) C-204.
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DInsert the resistor harness
(MB991866) behind the harness side connector C-204.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.61 or No.62 output?
YES (when No.62 is output)YES (when No.61 is output)NO
Check the clock spring (Refer to P.52B-59.)
NOYES
Replace the clock spring.Replace the driver’s air bag module
(squib).
Replace the SRS-ECU.
NG
Correct
Check connector:C-21, C-204
Check the trouble symptoms.
Check the harness between the
clock spring and the SRS-ECU, and
repair if necessary.
NG
OK
NG
OK
NG
Connector C-21Connector C-21 Resistor harness
(MB991866)
C - 204 clock spring
harness side connector Dummy resistor
(MB991865)
resistance (3Ω)
Replace the SRS-
ECU. OK

SRS -Troubleshooting52B-37
Replace the SRS-ECU.
clock spring>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the the clock spring connector
C-204.
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 11 or 12 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to avoid
a possible decrease in the contact pressure.
OK:0V
NG
From Previous Page
YES (when No.62 is output)YES (when No.61 is output)
Replace the SRS-
ECU.
Correct
Check connector:C-21, C-204
Check the trouble symptoms.
Check the harness between the
clock spring and the SRS-ECU, and
repair if necessary.OK
clock spring>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the clock spring connector C-204 .
DMeasure at the harness side
DContinuity between terminal 11 or 12 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to avoid
a possible decrease in the contact pressure.
OK:No continuity
NG
OK
NG
OK
NG
Connector C-21 Connector C-21

SRS -Troubleshooting52B-38
Code No.64 Front passenger’s air bag module (squib)
system (short-circuited to power supply)Possible Cause
Code No.65 Front passenger’s air bag module (squib)
system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU front passenger’s
air bag module (squib) is short-circuited to power supply (code No.64) or
short-circuited to earth (code No.65).DHarness or connector fault
DThe harness of the front passenger’s air bag
module (squib) is short-circuited to power supply
(code No.64) or short-circuited to earth (code
No.65).
DSRS-ECU inoperable
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the front passenger’s air bag
module connector C-109 .
DMeasure at the harness side
DContinuity between terminal 9 or 10 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:No continuity
NO
Replace the front passenger’s seat air bag module (squib).

MUT-II self-diag code
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DDisconnect the front passenger’s air bag module connector C-109
and insert the resistor harness (MB991866) behind the harness side
connector.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.64 or No.65 output?
YES (when No.65 is output)YES (when No.64 is output)
Replace the SRS-ECU.
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the front passenger’s air bag
module connector C-109 .
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 9 or 10 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V
NG
Replace the SRS-ECU.
Correct
Check connector:C-21, C-109
Check the trouble symptoms.
Check the harness between the front
passenger’s air bag module and the
SRS-ECU, and repair if necessary.OK
NG
OK
NG
OK
NG
Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s air bag
module connector
Connector C-21Connector C-21

SRS -Troubleshooting52B-39
Code No.66 Driver’s seat belt pre-tensioner (squib)
system (short-circuited to power supply)Possible Cause
Code No.67 Driver’s seat belt pre-tensioner (squib)
system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU driver’s seat belt
pre-tensioner (squib) is short-circuited to power supply (code No.66) or
short-circuited to earth (code No.67).DHarness or connector fault
DThe harness of the driver’s seat belt pre-tensioner
(squib) is short-circuited to power supply (code
No.66) or short-circuited to earth (code No.67).
DSRS-ECU inoperable
Replace the SRS-ECU. OK
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the driver’s seat belt pre-tensioner
D-28*
1and D-26*2.
DMeasure at the harness side
DContinuity between terminal 29 or 30 and
body earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:No continuity
NO
Replace the driver’s seat belt pre-tensioner.

MUT-II self-diag code
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DDisconnect the driver’s seat belt pre-tensioner connector D-28*
1and
D-26*2and insert the resistor harness (MB991866) behind the
harness side connector.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.66 or No.67 output?
YES (when No.67 is output)YES (when No.66 is output)
Replace the SRS-ECU.
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the driver’s seat belt pre-tensioner
D-28*
1and D-26*2.
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 29 or 30 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V
NG
Check connector:D-28*1, D-26*2, C-133*1, C-112*2, C-41
Check the trouble symptoms.
Check the harness between the driver’s seat belt pre-tensioner and the SRS-ECU,
and repair if necessary.
NG
OK
NG
OKResistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Driver’s seat belt
pre-tensioner connector
Connector C-41
Connector C-41
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles