Mitsubishi 380. Manual — part 740
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-371
STEP 3. Check the CAN bus lines inside the A/T-ECU.
Measure the resistance at 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 check between ABS-ECU and
ENGINE-ECU only.
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, and measure the
resistance at the component side of A/T-ECU connector
B-19.
(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.
(4) Measure the resistance between A/T-ECU connector B-19
terminals 14 and 5.
OK: 2 ohms or less
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB518A
TEST
HARNESS
TEST
HARNESS
COMPONENT SIDE: B-19
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-372
(5) Measure the resistance between A/T-ECU connector B-19
terminals 4 and 13.
OK: 2 ohms or less
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Do all the resistances measure 2 ohms or less?
YES : If all the resistances measure 2 ohms or less, power
supply to the ENGINE-ECU may be suspected.
Diagnose the engine. Refer to GROUP 13A, MPI
diagnosis
NO : If either or all of the resistances measures more than
2 ohms, replace the A/T-ECU.
16DB519A
TEST
HARNESS
TEST
HARNESS
COMPONENT SIDE: B-19
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-373
DIAGNOSTIC ITEM 12: Diagnose the lines between CAN main bus line and the A/T-ECU
NOTE: When diagnosing CAN-BUS on vehi-
cles with manual transmission (M/T), disregard
A/T-ECU and it’s wiring circuits and measure
between ABS-ECU and ENGINE-ECU only.
NOTE: When diagnosing CAN-BUS on vehicles
not equipped with a multi-centre display, disre-
gard the multi-centre display and it’s wiring cir-
cuits.
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.
.
TROUBLE JUDGMENT
If the MUT-III cannot received signals from the
ENGINE-ECU, CAN bus line connector(s) are bro-
ken or an open circuit has occurred.
.
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 the ENGINE-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 damage terminals, or termi-
nals pushed back in the connector
• The ABS-ECU may be defective
• The A/T-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 and measure
between ABS-ECU and ENGINE-ECU only.
16DB402A
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-374
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991219: Inspection Test Harness
• MB992044: ENGINE-ECU Harness
• MB992045: A/T-ECU Harness
STEP 1. Check ABS-ECU connector A-02, A/T-ECU
connector B-19 and ENGINE-ECU connector B-21 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 ABS-ECU connector A-02, A/T-ECU connector B-19
and ENGINE-ECU connector B-21 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
16DB402A
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
16DB407A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
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