Mitsubishi Evolution X. Manual — part 1129
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-151
DIAGNOSTIC ITEM 24: Diagnose when the scan tool cannot receive the data sent by combination
meter.
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-152
.
FUNCTION
If the scan tool MB991958 cannot communicate with
the combination meter, this diagnosis result will be
set.
.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the combination
meter, the ETACS-ECU determines that there is a
failure.
.
TROUBLESHOOTING HINTS
• Malfunction of the connector [joint connector
(CAN1), combination meter connector improperly
connected]
• Malfunction of the wiring harness [open circuit
between the combination meter connector and
the joint connector (CAN1), power supply circuit
to the combination meter]
• Malfunction of the combination meter
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-105 and
combination meter connector C-04 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 combination
meter connector C-04 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC708950CB
C-04
C-105
Connectors: C-04, C-105
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-153
STEP 2. Check the wiring harness between joint connector
(CAN1) C-105 and combination meter connector C-04.
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
(1) Disconnect joint connector (CAN1) C-105 and combination
meter connector C-04, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 3) and combination meter connector C-04
(terminal 14)
(3) Check the wiring harness between joint connector (CAN1)
C-105 (terminal 14) and combination meter connector C-04
(terminal 15)
Q: Is the wiring harness between joint connector (CAN1)
C-105 and combination meter connector C-04 in good
condition?
YES : Check the power supply circuit of the combination
meter. Refer to GROUP 54A, combination meter
−
.
NO : Repair the wiring harness between joint connector
(CAN1) C-105 and combination meter connector
C-04.
AC709707
AC709707 CN
Harness side: C-105
Harness side: C-04
TEST HARNESS
TEST HARNESS
AC709707 CO
Harness side: C-105
Harness side: C-04
TEST HARNESS
TEST
HARNESS
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-154
DIAGNOSTIC ITEM 25: Short to power supply or ground in both CAN_H and CAN_L lines of the
CAN-B bus lines.
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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