Mitsubishi Evolution X. Manual — part 1124
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-131
.
FUNCTION
If the scan tool MB991958 cannot communicate with
the SRS-ECU, this diagnosis result will be set.
.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the SRS-ECU,
the ETACS-ECU determines that there is a failure.
.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1), SRS-ECU connector improperly con-
nected]
• Malfunction of the wiring harness [open circuit
between the SRS-ECU connector and the joint
connector (CAN1), power supply circuit to the
SRS-ECU]
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-105 and SRS-ECU
connector C-37 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Are joint connector (CAN1) C-105 and SRS-ECU
connector C-37 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC708951AC
C-37 (Y)
Connector: C-37
AC708950
Connector: C-105
BL
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-132
STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and SRS-ECU connector C-37 for open
circuit.
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
(1) Disconnect joint connector (CAN1) C-105 and SRS-ECU
connector C-37, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 8) and SRS-ECU connector C-37 (terminal
15)
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 21) and SRS-ECU connector C-37
(terminal 16)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between joint connector (CAN1)
C-105 and SRS-ECU connector C-37 in good condition?
YES : Check the power supply circuit of the SRS-ECU.
Refer to GROUP 52B, SRS
− Troubleshooting
.
NO : Repair the wiring harness between joint connector
(CAN1) C-105 and SRS-ECU connector C-37.
AC709707
AC709707 BZ
Harness side: C-105
Harness side: C-37
TEST HARNESS
TEST
HARNESS
AC709707 CA
Harness side: C-105
Harness side: C-37
TEST HARNESS
TEST
HARNESS
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-133
DIAGNOSTIC ITEM 18: Diagnose when the scan tool cannot receive the data sent by occupant
classification-ECU.
CAUTION
When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted
water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.
CAN-B Communication Circuit
ETACS-ECU
INTERFACE
CIRCUIT
INTERFACE
CIRCUIT
CAN DRIVE
CIRCUIT
HANDS FREE
MODULE
OCCUPANT
CLASSIFICATION-
ECU
SATELLITE
RADIO
TUNER
RADIO AND CD
PLAYER
NOTE
VEHICLES WITHOUT MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)
VEHICLES WITH MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS)
CAN
TRANSCEIVER
CIRCUIT
CAN BOX UNIT
JOINT CONNECTOR
(CAN1)
FRONT SEAT
ASSEMBLY (LH)
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-134
.
FUNCTION
If the scan tool MB991958 cannot communicate with
the occupant classification-ECU, this diagnosis result
will be set.
.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the occupant
classification-ECU, the ETACS-ECU determines that
there is a failure.
.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1), occupant classification-ECU connector
improperly connected]
• Malfunction of the wiring harness [open circuit
between the occupant classification-ECU con-
nector and the joint connector (CAN1), power
supply circuit to the occupant classification-ECU]
• Malfunction of the occupant classification-ECU
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-105, occupant
classification-ECU connector D-39, D-39-2 and
intermediate connector C-41 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Are joint connector (CAN1) C-105, occupant
classification-ECU connector D-39, D-39-2 and
intermediate connector C-41 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC708950CA
C-41
C-105
Connectors: C-41, C-105
AC708954 AV
Connectors: D-39, D-39-2
D-39,
D-39-2
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