Mitsubishi Lancer Evolution 8. Manual — part 115
SRS AIRBAGS – TROUBLESHOOTING
52B-25
Check connectors: C-116,
C-124, D-02
Check the fault symptoms
Replace the SRS-ECU
Check harness between
the driver’s seat belt pre-
tensioner & SRS-ECU
Replace the driver’s seat belt pre-tensioner
Replace the
SRS-ECU
(Checking the circuit between the SRS-ECU
and the driver’s seat belt pre-tensioner)
Measure at the SRS-ECU connector C-124
• Detach the SRS-ECU connector C-124
• Detach the driver’s seat belt pre-tensioner
connector D-02 (see p.52B-34)
• Ignition switch ON
• Measure at harness side
• Voltage between 29, 30 and body earth
Caution
Do not insert the probe, etc. directly into
the terminal from the front side of the
connector, as this may cause a reduction
in contact pressure.
OK: 0V
(Checking the circuit between the SRS-ECU
and the driver’s seat belt pre-tensioner)
Measure at the SRS-ECU connector C-124
• Detach the SRS-ECU connector C-124
• Detach the driver’s seat belt pre-tensioner
connector D-02 (see p.52B-34)
• Measure at harness side
• Voltage between 29, 30 and body earth
Caution
Do not insert the probe, etc. directly into
the terminal from the front side of the
connector, as this may cause a reduction
in contact pressure.
OK: No connectivity
Code No. 66 Driver's seat belt pre-tensioner (squib) system (shorted to
power supply)
Code No. 67 Driver's seat belt pre-tensioner (squib) system (shorted to
earth)
Possible cause
This code is output when the driver's seat belt pre-tensioner (squib) circuit of
the SRS-ECU is shorted to the power supply (Code No. 66) or shorted to earth
(Code No. 67).
• Harness or connector fault
• Shorting of driver's seat belt pre-tensioner
(squib) harness to power supply (Code No.
66) or to earth (Code No. 67)
• SRS-ECU fault
(Checking the driver’s seat belt pre-tensioner (squib))
MUT-II/III diagnosis code
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991884)
• Detach the driver’s seat belt pre-tensioner connector D-02
(see p.52B-34)
• Connect the resistor harness (MB991884) to the harness
side of the driver’s seat belt pre-tensioner connector D-02
• Connect the (–) terminal of the battery
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No. 66 or 67 output?
Dummy resistor
(MB991865)
Resistance (3
Ω
)
Resistor harness
(MB991884)
D-02 Driver’s seat belt pre-tensioner
connector (harness side)
C-124 connector
C-124 connector
Y1740AU
Y1741AU
Repair
NG
NG
NG
OK
NG
OK
YES (No.66 output)
YES (No.67 output)
NO
OK
SRS AIRBAGS – TROUBLESHOOTING
52B-26
(Checking the circuit between the SRS-ECU
and the front passenger’s seat belt pre-
tensioner)
Measure at the SRS-ECU connector C-124
• Detach the SRS-ECU connector C-124
• Detach the front passenger’s seat belt pre-
tensioner connector D-14 (see p.52B-34)
• Ignition switch ON
• Measure at harness side
• Voltage between 27, 28 and body earth
Caution
Do not insert the probe, etc. directly into
the terminal from the front side of the
connector, as this may cause a reduction
in contact pressure.
OK: 0V
(Checking the circuit between the SRS-ECU
and the front passenger’s seat belt pre-
tensioner)
Measure at the SRS-ECU connector C-124
• Detach the SRS-ECU connector C-124
• Detach the front passenger’s seat belt pre-
tensioner connector D-14 (see p.52B-34)
• Measure at harness side
• Voltage between 29, 30 and body earth
Caution
Do not insert the probe, etc. directly into
the terminal from the front side of the
connector, as this may cause a reduction
in contact pressure.
OK: No connectivity
Replace the front passenger’s seat belt pre-tensioner
Replace the SRS-ECU
Check connectors: C-116, C-
124, D-14
Check the fault symptoms
Replace the
SRS-ECU
Check harness between the
front passenger’s seat belt
pre-tensioner & SRS-ECU
Code No. 68 Front passenger's seat belt pre-tensioner (squib)
system (shorted to power supply)
Code No. 69 Front passenger's seat belt pre-tensioner (squib)
system (shorted to earth)
Possible cause
This code is output when the front passenger's seat belt pre-
tensioner (squib) circuit of the SRS-ECU is shorted to the power
supply (Code No. 68) or shorted to earth (Code No. 69).
• Harness or connector fault
• Shorting of front passenger's seat belt pre-tensioner
(squib) harness to power supply (Code No. 68) or to
earth (Code No. 69)
• SRS-ECU fault
(Checking the front passenger’s seat belt pre-tensioner
(squib))
MUT-II/III diagnosis code
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991884)
• Detach the front passenger’s seat belt pre-tensioner
connector D-14 (see p.52B-34)
• Connect the resistor harness (MB991884) to the harness
side of the front passenger’s seat belt pre-tensioner
connector D-14
• Connect the (–) terminal of the battery
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No. 68 or 69 output?
Dummy resistor
(MB991865)
Resistance (3Ω)
Resistor harness
(MB991884)
D-14 Front passenger’s seat belt pre-
tensioner connector (harness side)
C-124 connector
C-124 connector
Y1742AU
Y1743AU
YES (No.68 output)
YES (No.69 output)
OK
NO
NG
OK
NG
NG
Repair
OK
NG
SRS AIRBAGS – TROUBLESHOOTING
52B-27
6. Trouble Symptoms Category Chart
7. Trouble Symptoms Inspection Procedures
Inspection Procedure 1
Can the MUT-II/III communicate with other systems?
Inspect MUT-II diagnosis circuit, and repair
Check connectors: C-125, C-110, C-122
Inspect the harness between the SRS-ECU and the
diagnosis connector, and repair
Check connector: C-125
Inspect the harness between the SRS-ECU & earth, and repair
Check connectors: C-125, C-212, C-210
Inspect the harness between the SRS-ECU and the ignition
switch, and repair
Confirm the trouble symptoms
Confirm the trouble symptoms
Confirm the trouble symptoms
Measure at the SRS-ECU connector C-125 and the
diagnosis connector C-122
• Detach the SRS-ECU connector C-125 & the diagnosis
connector C-122, and measure at the harness side
• Connectivity between the following terminals
C-125 connector side
C-122 connector side
20
7
OK: No connectivity
Measure at the SRS-ECU connector C-125
• Detach the connector and measure at the harness side
(1) Connectivity between 7 & body earth
OK: Connectivity
• Connect the (-) terminal of the battery
• Ignition switch : ON
(2) Voltage between 13 & body earth
OK: 9 V or above
(3) Voltage between 16 & body earth
OK: 9 V or above
Replace the SRS-ECU
Symptom
Symptom Inspection Procedure No.
Reference page
Cannot communicate with MUT-II/III
1
52B-27
Cannot communicate with MUT-II/III
Possible cause
If there is no communication with any other parts of the system, then there is a
high probability that the diagnosis circuit is malfunctioning. If communication is
only possible with the SRS airbags, then it may be that there is a disconnection
in the SRS-ECU diagnosis output circuit or power supply circuit (including earth
circuit).
• Harness or connector fault
• SRS-ECU fault
• Incompatible MUT ROM pack
YES
OK
OK
OK
NG
OK
NG
NG
OK
NG
NG
NG
Repair
Repair
Repair
NO
NG
(1) NG
(2), (3)
NG
SRS AIRBAGS – POST-COLLISION DIAGNOSIS
52B-28
Post-Collision Diagnosis
The following procedure must be used to check and service the vehicle after a collision, regardless of whether or not the
airbags have been deployed. Apart from the items listed below, servicing is the same as that for the previous model.
1. Repair procedure
1-1 When the SRS airbags have deployed
(1) Replace the front impact sensors with new sensors. (See p.52B-30)
(2) Check for pinching of the harness, damage to the connectors and deformation of the terminals.
1-2 When the airbags have not deployed, in a low-speed collision
(1) Inspect the front impact sensors.
(2) If a visual inspection of the front impact sensors reveals any dents, fractures, deformation, or the like, then the sensors
must be replaced with new ones.
(3) For information on removing and reinstalling front impact sensors, see “Servicing SRS airbag and seat belt pre-tensioner
components” (p.52B-29–31).
Front impact sensors
(1) Check for any deformation or corrosion of the headlight support
panel
(2) Check for any dents, fractures or deformations in the front
impact sensors.
(3) Check for any pinching of the centre harness, damage to the
connectors, or deformation of the terminals.
Radiator
Front impact sensor
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