Mitsubishi 380. Manual — part 667
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-79
(3) Measure the voltage between ENGINE-ECU connector
terminal 86 and body ground.
OK: 1.0 V or less
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Does the voltage measure 1.0 V or less?
YES : If the voltage measures 1.0 V or less, go to Step 47.
NO : If the voltage measures more than 1.0 V, 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 a
short to the power supply. Measure the voltage at A/T-ECU
connector B-19 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
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) please disregard A/T ECU and
its circuits.
16DB478A
CONNECTOR: C-121
HARNESS SIDE
C-121 (Y)
48
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-80
(2) Connect special tool MB992045 (A/T check harness) to the
A/T-ECU and the wiring harness, and measure the voltage
at special tool MB992045 (A/T check harness).
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between special tool MB992045 (A/T
check harness) connector terminal 14 and body ground.
OK: 4.0 V or less
Q: Does the voltage measure 4.0 V or less?
YES : If the voltage measures 4.0 V or less, diagnose CAN
bus lines thoroughly by referring to
NO : If the voltage measures more than 4.0 V, replace the
A/T-ECU.
NOTE: When diagnosing CAN BUS on vehicles with
manual transmission (M/T) please disregard A/T ECU and
its circuits.
16DB488A
TEST
HARNESS
SPECIAL TOOL
MB992045
A/T-
ECU
MEASURE AT THIS CONNECTOR
SPECIAL TOOL MB992045
CONNECTOR
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-81
DIAGNOSTIC ITEM 2: Diagnose shorts in the power supply to CAN bus line <Vehicles with
multi-center display >
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
16DB473A
CONNECTORS: C-15, C-121
C-121 (Y)
C-15 (B)
16DB474A
C-218 (GR)
CONNECTOR: C-218
HARNESS SIDE
JUNCTION BLOCK
(REAR VIEW)
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-82
.
TROUBLE JUDGMENT
A short to the power supply may be present when the
voltage between the CAN bus line (CAN_L or
CAN_H) and body ground is more than 4.0 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 a 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 ABS-ECU may be defective
• The SRS-ECU may be defective
• The multi-centre display unit (middle-grade type
may be defective
• The ENGINE-ECU may be defective
• The A/T-ECU may be defective
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