Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 570

Code No.66 Driver's seat belt pre-tensioner (squib)
system (short-circuited to power supply)
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).
Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
YES (when No.66 is output)
<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
1 2
D-28* and D-26* .
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
Connector C-41
OK
NG
Replace the SRS-ECU.
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
S R S -
Tr o u b l e s h o o t i n g
<Check the driver's seat belt pre-tensioner (squib)>
MUT-II self-diag code
Resistor harness
D Connect the dummy resistor (MB991865) to the resistor harness
(MB991866)
D Disconnect the driver's seat belt pre-tensioner connector D-28*
D Connect the negative (- ) terminal of the battery
Driver's seat belt
D Check the diagnosis code again after erasing the memory.
pre-tensioner connector
Is code No.66 or No.67 output?
<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
1
D-28* and D-26*
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
Connector C-41
Check connector: D-28*
Check the trouble symptoms.
Check the harness between the driver's seat belt pre-tensioner and the SRS-ECU,
and repair if necessary.
Possible Cause
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
(MB991866).
2
D-26* 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.
YES (when No.67 is output)
Replace the driver's seat belt pre-tensioner.
2
.
NG
1 2 1
, D-26* , C-133* , C-112*
OK
NG
52B-39
1
and
NO
OK
Replace the SRS-ECU.
2
, C-41