Mitsubishi 380. Manual — part 681
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DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-134
54C
DIAGNOSTIC ITEM 3: Diagnose shorts in the ground to CAN bus line <Vehicles without multi-center
display >
NOTE: When diagnosing CAN-BUS on vehicles
with manual transmission (M/T), disregard
A/T-ECU and it’s wiring circuits.
NOTE: When diagnosing CAN-BUS on vehicles
that are not equipped with a multi-centre display,
disregard the multi-centre display and it’s wiring
circuits.
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 con-
nected to the CAN bus line may be damaged.
16DB402A
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
16DB407A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB472A
C-101
C-125 (B)
C-29
C-02
CONNECTORS: C-02, C-29, C-101, C-125
16DB473A
CONNECTORS: C-15, C-121
C-121 (Y)
C-15 (B)
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DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-135
.
TROUBLE JUDGMENT
A short to ground may be present when the voltage
between the CAN bus line (CAN_L or CAN_H) and
body ground is less than 1.0 V. In this condition, an
abnormal voltage may be measured at CAN_L and
CAN_H lines.
.
COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector, or an ECU may be
defective.
.
TROUBLESHOOTING HINTS
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The ETACS-ECU may be defective
• The combination meter may be defective
• The A/C-ECU may be defective
• The SRS-ECU may be defective
• The ABS-ECU may be defective
• The A/T- ECU may be defective
• The ENGINE- ECU may be defective
NOTE: When diagnosing CAN-BUS on vehi-
cles with manual transmission (M/T), disregard
A/T-ECU and it’s wiring circuits.
NOTE: When diagnosing CAN-BUS on vehicles
that are not equipped with a multi-centre display,
disregard the multi-centre display and it’s wiring
circuits.
16DB474A
C-218 (GR)
CONNECTOR: C-218
HARNESS SIDE
JUNCTION BLOCK
(REAR VIEW)
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DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-136
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991219: Inspection Test Harness
• MB992045: A/T-ECU Check Harness
STEP 1. Check ENGINE- ECU connector B-21, combination
meter connector C-101 and data link connector C-125 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 ENGINE- ECU connector B-21, combination meter
connector C-101 and data link connector C-125 in good
condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
16DB475A
CONNECTORS: C-101, C-125
C-101
C-125
C-125 (B)
C-101 HARNESS SIDE
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DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-137
STEP 2. Check the CAN_H-side bus line (communication
line including ECUs) for short to ground. Measure the
resistance at data link connector C-125.
CAUTION
A digital multimeter should be used. For details refer to
CAUTION
The test wiring harness should be used. For details refer to
(1) Disconnect ENGINE- ECU connector B-21 and combination
meter connector C-101, and measure the resistance at the
harness side of data link connector C-125.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
CAUTION
Disconnect the negative battery terminal. For details refer
to
.
(3) Disconnect the negative battery terminal.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
16DB475A
CONNECTORS: C-101, C-125
C-101
C-125
C-125 (B)
C-101 HARNESS SIDE
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