Mitsubishi Colt Ralliart. Manual — part 551
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TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-42
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 4F set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
Code No.3C, 3D, 4C, 4D, 14, 15, 16, 17, 31, 32, 45, 51, 52, 54, 55, 56, 57, 58, 59, 73, 74, 83, 84 system
inside SRS-ECU
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes are set when a fault is
detected in the SRS-ECU. The most likely causes for
this code to be set are shown in the table below:
Code No.
Part/Circuit integral to
SRS-ECU
Trouble causes
3C
Curtain air bag module (squib)
(RH) (squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
3D
• Open circuit in the squib ignition drive circuit
4C
Curtain air bag module (squib)
(LH) (squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
4D
• Open circuit in the squib ignition drive circuit
14
Analogue G-sensor
• When the analogue G-sensor is not operating
• When the characteristics of the analogue G-sensor
are abnormal
• When the output from the analogue G-sensor is
abnormal
15
Safing G-sensor (for frontal
collision)
• Short circuit in the safing G-sensor
16
• Open circuit in the safing G-sensor
17
Safing G-sensor (for side
collision)
• When the safing G-sensor is not operating
• When the characteristics of the safing G-sensor are
abnormal
• When the output from the safing G-sensor is abnormal
31
Capacitor circuit
• Voltage at the capacitor terminal is higher than the
specified value for five seconds or more
32
• Voltage at the capacitor terminal is lower than the
specified value for five seconds or more (This is not
detected if diagnosis code No.41 or 42 indicating
battery positive voltage drop has been sent).
45
Non-volatile memory (EEPROM)
and A/D converter
• When the non-volatile memory (EEPROM) and A/D
converter system are abnormal
51
Driver's air bag module (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
52
• Open circuit in the squib ignition drive circuit
54
Passenger's (front) air bag
module (squib ignition drive
circuit)
• Short circuit in the squib ignition drive circuit
55
• Open circuit in the squib ignition drive circuit
Main
Index
Group
TOC
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TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-43
PROBABLE CAUSE
• Malfunction of the SRS-ECU
DIAGNOSIS
Replace the SRS-ECU (Refer to
Code No.21: Driver's air bag module (squib) system (short-circuited between terminals of the squib
circuit)
56
Driver’s seat belt pre-tensioner
(squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
57
• Open circuit in the squib ignition drive circuit
58
Passenger’s (front) seat belt
pre-tensioner (squib ignition drive
circuit)
• Short circuit in the squib ignition drive circuit
59
• Open circuit in the squib ignition drive circuit
73
Side-airbag module (RH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
74
• Open circuit in the squib ignition drive circuit
83
Side-airbag module (LH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
84
• Open circuit in the squib ignition drive circuit
Code No.
Part/Circuit integral to
SRS-ECU
Trouble causes
AC510223
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet
AIR BAG MODULE
(SQUIB)
(DRIVER'S SIDE)
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
CLOCK
SPRING
SRS-ECU
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Driver's Air Bag Module (Squib) Circuit
AB
Main
Index
Group
TOC
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TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-44
OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the front impact sensors
and the front air bag analogue G-sensor. If the
impact is over a predetermined level, the
SRS-ECU sends an ignition signal. At this time, if
the front air bag safing G-sensor is on, the SRS
air bag will inflate.
• The ignition signal is input to the air bag module
via the clock spring to inflate the air bag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one driver's air bag
squib wire shorted to the other. However, if no diag-
nosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).
PROBABLE CAUSES
• Improper engaged connector or defective short
spring*
• Short circuit in the clock spring
• Short circuit between the driver's air bag module
(squib) circuit terminals
• Damaged connector(s)
• Malfunction of the SRS-ECU
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the earth wire in the
squib circuit when the connectors are disconnected).
Therefore, if connector B-35, B-136 or B-138 is dam-
aged or improperly engaged, the short spring may
not be released when the connector is connected.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code.
Q: Is diagnosis code 34 set?
YES :
Go to Step 2.
NO :
Go to Step 3.
STEP 2. Connector lock check: SRS-ECU
connector B-35. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors B-35 and then reconnect
them.
(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 21 set?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code 21 set as connector
B-35 was engaged improperly.
STEP 3. Connector lock check: SRS-ECU
connector B-35, clock spring connector B-136
and driver’s air bag module connector B-138.
(M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors B-35, B-136 and B-138,
and then reconnect them.
AC206285
AF
B-35 (Y)
Connector: B-35
Harness side
connector
(rear view)
AC206285
AF
B-35 (Y)
Connector: B-35
Harness side
connector
(rear view)
AC313828 AE
Connectors: B-136, B-138
B-138
B-136
B-136
B-138
Harness side
connector
(front view)
Main
Index
Group
TOC
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TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-45
(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 21 set?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code 21 set as connector
B-35, B-136 or B-138 was engaged
improperly.
STEP 4. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) By sliding the A section (in the figure) of air bag
module connector B-138 in the arrow direction,
disconnect the connector.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991866).
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Insert special tool (MB991866) into clock spring
side air bag module connector B-138 by
backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 21 set?
YES :
Go to Step 5.
NO :
Replace the driver's air bag module (Refer
to
STEP 5. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect the clock spring connector B-136.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991866).
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Insert special tool (MB991866) into clock spring
harness side connector B-136 (terminal No.3 and
4) by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
AC105823
AC304700
AC305145AF
A
Steering
wheel
B-138 Air bag
module connector
AC300945AG
MB991865
(Dummy resistor : 3
Ω)
MB991866
(Resistor harness)
B-138 Air bag
module
connector
AC313828 AF
Connectors: B-136
B-136
Harness side
connector
(rear view)
AC300949 AF
MB991865 (Dummy
resistor : 3
Ω)
MB991866
(Resistor harness)
B-136 Clock spring
connector
(Rear view)
Main
Index
Group
TOC
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