Mitsubishi Evolution X. Manual — part 1125
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-135
STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and occupant classification-ECU connector
D-39-2 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 occupant
classification-ECU connector D-39-2, and check the wiring
harness.
(2) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 11) and occupant classification-ECU
connector D-39-2 (terminal 24)
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 24) and occupant classification-ECU
connector D-39-2 (terminal 25)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between joint connector (CAN1)
C-105 and occupant classification-ECU connector
D-39-2 in good condition?
YES : Check the power supply circuit of the occupant
classification-ECU. Refer to GROUP 52B, SRS air
bag Diagnosis
.
NO : Repair the wiring harness between joint connector
(CAN1) C-105 and occupant classification-ECU
connector D-39-2.
AC709707
AC709707 CB
Harness side: C-105
Harness side: D-39-2
TEST HARNESS
TEST HARNESS
AC709707 CC
Harness side: C-105
Harness side: D-39-2
TEST HARNESS
TEST
HARNESS
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-136
DIAGNOSTIC ITEM 19: Diagnose when the scan tool cannot receive the data sent by A/C-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
CAN DRIVE
CIRCUIT
A/C-ECU
COMBINATION
METER
SRS-ECU
WIRELESS
CONTROL
MODULE
KOS-ECU
NOTE
VEHICLES WITH WCM
VEHICLES WITH KOS
CAN DRIVE
CIRCUIT
CAN DRIVE
CIRCUIT
CAN DRIVE
CIRCUIT
JOINT CONNECTOR
(CAN1)
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-137
.
FUNCTION
If the scan tool MB991958 cannot communicate with
the A/C-ECU, this diagnosis result will be set.
.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the A/C-ECU,
the ETACS-ECU determines that there is a failure.
.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1), A/C-ECU connector improperly con-
nected]
• Malfunction of the wiring harness [open circuit
between the A/C-ECU connector and the joint
connector (CAN1), power supply circuit to the
A/C-ECU]
• Malfunction of the A/C-ECU
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-105 and A/C-ECU
connector C-22 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 A/C-ECU
connector C-22 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC708951CE
Connector: C-22
C-22 (B)
AC708950
Connector: C-105
BL
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-138
STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and A/C-ECU connector C-22 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 A/C-ECU
connector C-22, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 1) and A/C-ECU connector C-22 (terminal
11)
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 12) and A/C-ECU connector C-22 (terminal
12)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between joint connector (CAN1)
C-105 and A/C-ECU connector C-22 in good condition?
YES : Check the power supply circuit of the A/C-ECU. Refer
to GROUP 55, Diagnosis
NO : Repair the wiring harness between joint connector
(CAN1) C-105 and A/C-ECU connector C-22.
AC709707
AC709707 CD
Harness side: C-105
Harness side: C-22
TEST HARNESS
TEST
HARNESS
AC709707 CE
Harness side: C-105
Harness side: C-22
TEST
HARNESS
TEST
HARNESS
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