Warning MITSUBISHI LANCER EVOLUTION 2007 Service Manual PDF

SRS -Troubleshooting52B-22
Code No.25 Front passenger’s air bag module (squib)
systemPossible Cause
This code is output when open circuit occurs in the SRS-ECU front passenger’s
air bag (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)DOpen in the front passenger’s air bag module
(squib) circuit
DConnector improper contact
DSRS-ECU inoperable
NG
passenger’s air bag module>
Measure at the SRS-ECU connector C-21 and front
passenger’s air bag module connector C-109 .
DDisconnect the SRS-ECU connector C-21 and the front
passenger’s air bag module connector C-109 , and
measure at the harness side.
DContinuity check between the following terminals
Connector C-21 Connector C-109
9–2
10 – 1
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:Continuity (2Ωor less)
YESNO
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.25 output?
Replace the SRS-ECU.
Check the trouble
symptoms.
NG
Check the harness between the front passenger’s air bag
module and the SRS-ECU, and repair if necessary.
OKNG
Correct
Check connector:C-21, C-109
OK
Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s air bag
module connector
Connector C-21Connector C-109

SRS -Troubleshooting52B-23
Code No.26 Driver’s seat belt pre-tensioner (squib)
systemPossible Cause
This code is output when short circuit occurs between terminals of the
SRS-ECU driver’s seat belt pre-tensioner (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)DConnector engagement faulty or short bar faulty*
DShort circuit between terminals of the driver’s seat
belt pre-tensioner (squib) circuit
DFaulty connector
DSRS-ECU inoperable
NOTE:
*: The connector of the squib circuit contains a short bar (short-circuiting the positive (+) cable and the
negative ( - ) cable to avoid an erroneous deployment caused by static electricity when a connector is
not connected). Thus, when a connector is connected, the short bar may not be released due to improper
engagement of the connector or faulty connector as shown in the illustration below. Disconnect the connector
as shown in the illustration below, then reconnect it. Check that a diagnosis code is output again after
erasing the memory. If the diagnosis code is not output, the above-mentioned code is output due to
improper engagement of the connector.
C-41C-133*1,
C-112*2
SRS-ECU
Driver’s seat belt
pre-tensioner
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
D-28*1,
D-26*2

SRS -Troubleshooting52B-25
Code No.27 Driver’s seat belt pre-tensioner (squib)
systemPossible Cause
This code is output when open circuit occurs in the SRS-ECU driver’s seat belt
pre-tensioner (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)DConnector improper contact
DOpen in the driver’s seat pre-tensioner (squib)
circuit
DSRS-ECU inoperable

MUT-II self-diag code
DConnect the dummy harness (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.27 output?
YESNO
Replace the driver’s seat belt pre-tensioner.
Replace the SRS-ECU.
Check the trouble
symptoms.
NG
Check the harness between the driver’s seat belt pre-tensioner
and the SRS-ECU, and repair if necessary. NG
OK
OKNG
Correct
Check connector:D-28*1,D-26*2, C-133*1, C-112*2, C-124 Driver’s seat belt
pre-tensioner connector
seat belt pretensioner>
Measure at the SRS-ECU connector C-41, the driver’s seat
belt pre-tensioner connector D-28*
1and D-26*2.
DDisconnect the SRS-ECU connector C-41 , the driver’s
seat belt pre-tensioner connector D-28*1and D-26*2, and
then measure at the harness side.
DContinuity check between the following terminals
Connector C-41 D-28*
1,D-26*2
29 – 2
30 – 1
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:Continuity (2Ωor less)Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Connector C-41D-28*
1,D-26*2connector
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles

SRS -Troubleshooting52B-26
Code No.28 Front passenger’s seat belt pre-tensioner
(squib) systemPossible Cause
This code is output when short circuit occurs between terminals of the
SRS-ECU front passenger’s seat belt pre-tensioner (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)DConnector engagement faulty or short bar faulty*
DShort circuit between terminals of the front
passenger’s seat belt pre-tensioner (squib) circuit
DFaulty connector
DSRS-ECU inoperable
NOTE
*: The connector of the squib circuit contains a short bar (short-circuiting the positive (+) cable and the
negative ( - ) cable to avoid an erroneous deployment caused by static electricity when a connector is
not connected). Thus, when a connector is connected, the short bar may not be released due to improper
engagement of the connector or faulty connector as shown in the illustration below. Disconnect the connector
as shown in the illustration below, then reconnect it. Check that a diagnosis code is output again after
erasing the memory. If the diagnosis code is not output, the above-mentioned code is output due to
improper engagement of the connector.
C-41C-133*1,
C-112*2D-28*1,
D-26*2
SRS-ECUFront passenger’s seat
belt pre-tensioner
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles

SRS -Troubleshooting52B-28
Code No.29 Front passenger’s seat belt pre-tensioner
(squib) systemPossible Cause
This code is output when open circuit occurs in the SRS-ECU front passenger’s
seat belt pre-tensioner (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)DOpen in the front passenger’s seat pre-tensioner
(squib) circuit
DConnector improper contact
DSRS-ECU inoperable
passenger’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 , the front
passenger’s seat belt pre-tensioner connector D-28*
1and
D-26*2.
DDisconnect the SRS-ECU connector C-41 , the front
passenger’s seat belt pre-tensioner connector D-28*
1and
D-26*2, and then measure at the harness side.
DContinuity check between the following terminals
Connector C-41 D-28*
1, Connector D-26*2
28 – 2
27 – 1
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:Continuity (2Ωor less)
YESNO
Replace the front passenger’s seat belt pre-tensioner.

MUT-II self-diag code
DConnect the dummy harness (MB991865) to the resistor harness
(MB991866).
DDisconnect the front passenger’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.29 output?
Replace the SRS-ECU.
Check the trouble
symptoms.
NG
Check the harness between the front passenger’s seat belt
pre-tensioner and the SRS-ECU, and repair if necessary. NG
OK
OKNG
Correct
Check connector:D-28*1, D-26*2, C-133*1, C-112*2, C-41 Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s seat belt
pre-tensioner connector
Connector C-41Connector D-28*
1, D-26*2
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles

SRS -Troubleshooting52B-29
Code No.34 Connector Lock SystemProbable Cause
The SRS-ECU connector is mounted with a connector lock switch terminal for
detecting the connected state of the connector.
SRS-ECU connector is poorly connected.
However, when the vehicle condition returns to normal, this code will be
automatically erased, and the SRS warning lamp will go out.DFaulby connector
DSRS-ECU inperable
NOIs the SRS-ECU connector C-21 connected properly?
Replace the SRS-ECU.Correct YES
OK
Correct the connector connection.
Check trouble symptoms. NG
NGCheck the C-21 SRS-ECU connector.
DDisconnect the connector.
DCheck the connector lock switch terminal in the harness
side connector for contact pressure and deformation, etc.
(See Figure A.)
Is the connector lock switch terminal normal?
Connector lock switch terminal
Front view of the SRS-ECU connector
(harness side)
Figure A
Code No.35 SRS-ECU (deployed air bag) systemProbable cause
This code is displayed after deployment of air bags. If displayed before
deployment, the code indicates malfunction probably present in SRS-ECU.DSRS-ECU inperable
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-41
INSPECTION CHART FOR TROUBLE SYMPTOMS
Study the trouble symptoms and check according to the inspection procedure chart.
TroubleInspection procedure No(s).Reference page
Communication with MUT-II is impossible.152B-41
SRS warning lamp does not illuminate.See diagnosis code No.43.52B-33
SRS warning lamp does not go out.See diagnosis code No.43, 44.52B-33
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is impossible.
Probable cause
When communication with all systems is impossible, diagnosis circuit is
suspected as faulty.
When only communication with SRS air bags is impossible, open in diagnosis
output circuit or power supply circuit including earth circuit may be present.DHarness, connector malfunction
DSRS-ECU malfunction
DMUT ROM pack unmatching
OKReplace the SRS-ECU.
NG
NG
Check the harness between the SRS-ECU and the ignition
switch IG1, and repair if necessary.
NOCheck the MUT-II diagnosis circuit, and repair if necessary.
OK
Check the trouble symptoms.
NG
Correct
NG
Check the harness between the SRS-ECU and earth, and
repair if necessary.
OK
Check the trouble symptoms.
NG
Correct
OK
OK
Check the trouble
symptoms.
Check the harness between the SRS-ECU and the diagnosis
connector, and repair if necessary.
YES
(1) NG
Check connector:C-21
(2), (3)
NG
Check connector:C-21, C-213, C-210
circuit)>
Measure at the C-21 SRS-ECU connector.
DDisconnect the SRS-ECU connector C-21 and measure at
the harness side.
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.
(1) Continuity between terminal
7 and body earth
OK:Continuity (2Ωor less)
DConnect the negative ( - ) terminal
of the battery
DIgnition switch:ON
(2) Voltage between terminal 13
and body earth
OK:9 V or more
(3) Voltage between terminal 16
and body earth
OK:9 V or more
NG
Correct
Check connector:C-21, C-26, C-22
Is communication by MUT-II possible when the ignition switch
is ON?
NG
Measure at the SRS-ECU connector C-21 and diagnosis
connector C-22 .
DDisconnect SRS-ECU connector C-21 and measure at the
harness side and diagnosis connector C-22.
DContinuity check between the following terminals
C-21 connector C-22 connector
20 – 7
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:Continuity (2Ωor less)
Connector C-21
Connector C-22
Connector C-21
Connector C-21