Mitsubishi 380. Manual — part 693
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-182
(4) Measure the resistance between ENGINE- ECU connector
terminal 86 and body ground.
OK: 1 k
Ω or more
NOTE: When diagnosing CAN BUS on vehicles with
manual transmission (M/T) disregard A/T-ECU and it’s wir-
ing circuits and measure between ABS-ECU and
ENGINE-ECU only.
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Does the resistance measure 1 k
Ω or more?
YES : If the resistance measures 1 k
Ω or more, go to Step
47 .
NO : If the resistance measures less than 1 k
Ω, repair the
wiring harness between ENGINE- ECU connector
and A/T-ECU connector.
STEP 47. Check the CAN_L line inside the A/T-ECU for
short to ground. Measure the resistance at A/T-ECU
connector B-19.
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 A/T-ECU connector B-19.
NOTE: When diagnosing CAN BUS on vehicles with
manual transmission (M/T) disregard A/T-ECU and it’s wir-
ing circuits and measure between ABS-ECU and
ENGINE-ECU only.
16DB497A
HARNESS SIDE: B-21
TEST
HARNESS
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-183
(2) Connect special tool MB992045 (A/T check harness) to the
A/T-ECU and the wiring harness, and measure the
resistance at special tool MB992045 (A/T check harness).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
NOTE: When diagnosing CAN BUS on vehicles with
manual transmission (M/T) disregard A/T-ECU and it’s wir-
ing circuits and measure between ABS-ECU and
ENGINE-ECU only.
CAUTION
Disconnect the negative battery terminal. For details refer
to
.
(4) Disconnect the negative battery terminal.
(5) Measure the resistance between special tool MB992045
(A/T check harness) connector terminal 14 and body
ground.
OK: 1 k
Ω or more
Q: Does the resistance measure 1 k
Ω or more?
YES : If the resistance measures 1 k
Ω or more, diagnose
CAN bus lines thoroughly by referring to
NO : If the resistance measures less than 1 k
Ω, replace the
A/T-ECU.
16DB498A
TEST
HARNESS
SPECIAL TOOL
MB992045
A/T-
ECU
MEASURE AT THIS CONNECTOR
SPECIAL TOOL MB992045
CONNECTOR
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-184
DIAGNOSTIC ITEM 4: Diagnose shorts in the ground to CAN bus line <Vehicles with 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
16DB489A
CONNECTORS: C-05, C-15, C-121
C-121 (Y)
C-15 (B)
C-05 (B)
16DB472A
C-101
C-125 (B)
C-29
C-02
CONNECTORS: C-02, C-29, C-101, C-125
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-185
.
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 multi-centre display unit 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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