Mitsubishi Lancer Evolution 7. Manual — part 368
SRS -
Troubleshooting
52B-37
Replace the SRS-ECU.
<Check the circuit between the SRS-ECU and
clock spring>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the the clock spring connector
C-204.
D
Ignition switch:ON
D
Measure at the harness side
D
Voltage 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: 0 V
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
<Check the circuit between the SRS-ECU and
clock spring>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the clock spring connector C-204 .
D
Measure at the harness side
D
Continuity 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 -
Troubleshooting
52B-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).
D
Harness or connector fault
D
The 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).
D
SRS-ECU inoperable
<Check the circuit between the SRS-ECU and
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the front passenger’s air bag
module connector C-109 .
D
Measure at the harness side
D
Continuity 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).
<Check the front passenger’s air bag module (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect 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.
D
Connect the negative (-) terminal of the battery
D
Check 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.
<Check the circuit between the SRS-ECU and
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the front passenger’s air bag
module connector C-109 .
D
Ignition switch:ON
D
Measure at the harness side
D
Voltage 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: 0 V
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-21
Connector C-21
SRS -
Troubleshooting
52B-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).
D
Harness or connector fault
D
The 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).
D
SRS-ECU inoperable
Replace the SRS-ECU.
OK
<Check the circuit between the SRS-ECU and
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D
Disconnect the SRS-ECU connector C-41.
D
Disconnect the driver’s seat belt pre-tensioner
D-28*
1
and D-26*
2
.
D
Measure at the harness side
D
Continuity 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.
<Check the driver’s seat belt pre-tensioner (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect the driver’s seat belt pre-tensioner connector D-28*
1
and
D-26*
2
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.
D
Connect the negative (-) terminal of the battery
D
Check 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.
<Check the circuit between the SRS-ECU and
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D
Disconnect the SRS-ECU connector C-41.
D
Disconnect the driver’s seat belt pre-tensioner
D-28*
1
and D-26*
2
.
D
Ignition switch:ON
D
Measure at the harness side
D
Voltage 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: 0 V
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
OK
Resistor 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
SRS -
Troubleshooting
52B-40
Code No.68 Front passenger’s seat belt pre-tensioner
(squib) system (short-circuited to power supply)
Possible Cause
Code No.69 Front passenger’s seat belt pre-tensioner
(squib) system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU front passenger’s
seat belt pre-tensioner (squib) is short-circuited to power supply (code No.68) or
short-circuited to earth (code No.69).
D
Harness or connector fault
D
The harness of the front passenger’s seat belt
pre-tensioner (squib) is short-circuited to power
supply (code No.68) or short-circuited to earth
(code No.69).
D
SRS-ECU inoperable
NO
Replace the front passenger’s seat belt pre-tensioner.
<Check the front passenger’s seat belt pre-tensioner (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect the front passenger’s seat belt pre-tensioner connector
D-28*
1
and D-26*
2
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.
D
Connect the negative (-) terminal of the battery
D
Check the diagnosis code again after erasing the memory.
Is code No.68 or No.69 output?
YES (when No.69 is output)
YES (when No.68 is output)
Replace the SRS-ECU.
<Check the circuit between the SRS-ECU and
the front passenger’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D
Disconnect the SRS-ECU connector C-41.
D
Disconnect the front passenger’s seat belt
pre-tensioner connector D-28*
1
and D-26*
2
.
D
Ignition switch:ON
D
Measure at the harness side
D
Voltage between terminal 27 or 28 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: 0 V
NG
Replace the SRS-ECU.
Correct
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 front passenger’s seat belt pre-tensioner and the
SRS-ECU, and repair if necessary.
OK
<Check the circuit between the SRS-ECU and
the front passenger’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D
Disconnect the SRS-ECU connector C-41.
D
Disconnect the front passenger’s seat belt
pre-tensioner connector D-28*
1
and D-26*
2
.
D
Measure at the harness side
D
Continuity between terminal 27 or 28 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
Resistor harness
(MB991866)
Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s seat belt
pre-tensioner connector
Connector C-41
Connector C-41
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
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