Mitsubishi Evolution X. Manual — part 1123
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-127
DIAGNOSTIC ITEM 16: Diagnose when the scan tool cannot receive the data sent by WCM.
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-128
.
FUNCTION
If the scan tool MB991958 cannot communicate with
the WCM, this diagnosis result will be set.
.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the WCM, the
ETACS-ECU determines that there is a failure.
.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1), WCM connector improperly connected]
• Malfunction of the wiring harness [open circuit
between the WCM connector and the joint con-
nector (CAN1), power supply circuit to the WCM]
• Malfunction of the WCM
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-105 and WCM
connector C-07 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 WCM connector
C-07 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC708951CD
Connector: C-07
C-07
AC708950
Connector: C-105
BL
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-129
STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and WCM connector C-07 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 WCM
connector C-07, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 7) and WCM connector C-07 (terminal 11)
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 20) and WCM connector C-07 (terminal 10)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between joint connector (CAN1)
C-105 and WCM connector C-07 in good condition?
YES : Check the power supply circuit of the WCM. Refer to
GROUP 42C, WCM
− Diagnosis
NO : Repair the wiring harness between joint connector
(CAN1) C-105 and WCM connector C-07.
AC709707 BX
Harness side: C-105
Harness side: C-07
TEST
HARNESS
TEST
HARNESS
AC709707 BY
Harness side:
C-105
Harness side: C-07
TEST
HARNESS
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-130
DIAGNOSTIC ITEM 17: Diagnose when the scan tool cannot receive the data sent by SRS-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)
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