Mitsubishi 380. Manual — part 738
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-363
(4) Measure the resistance between A/T-ECU connector B-19
terminal 5 and ENGINE-ECU connector B-21 terminal 86.
OK: 2 ohms or less
(5) Measure the resistance between A/T-ECU connector B-19
terminal 4 and ENGINE-ECU connector B-21 terminal 64.
OK: 2 ohms or less
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
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, go to
Step 29.
NO : If either of the resistances measures more than 2
ohms or all the resistances measure more than 2
ohms, repair the wiring harness between A/T-ECU
connector B-19 and the ENGINE-ECU connector
B-21.
16DB510A
HARNESS SIDE: B-19
TEST
HARNESS
TEST
HARNESS
HARNESS SIDE: B-21
16DB511A
HARNESS SIDE: B-19
TEST
HARNESS
TEST
HARNESS
HARNESS SIDE: B-21
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-364
STEP 29. 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 5 and 14.
OK: 2 ohms or less
(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, or go
to Step 30 power supply to the ENGINE-ECU may be
suspected. Diagnose the engine. Refer to GROUP
13A, MPI diagnosis
<3.8L engine>.
NO : If either of the resistances measures more than 2
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB518A
TEST
HARNESS
TEST
HARNESS
COMPONENT SIDE: B-19
16DB519A
TEST
HARNESS
TEST
HARNESS
COMPONENT SIDE: B-19
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-365
ohms or all the resistances measure more than 2
ohms, replace the A/T-ECU.
STEP 30. Using diagnostic tool MB991958, diagnose the
CAN bus line (Disconnect A/T-ECU connector B-19, and
check the A/T-ECU system).
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.
(1) Disconnect A/T-ECU connector B-19.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose CAN bus lines, and check if the MUT-III screen is
as shown in the illustration.
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.
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB615A
: Red section on screen
ENGINE
ECU
METER
-ECU
ETACS
-ECU
AC-ECU
SRS-ECU
C.DISPLAY
MUT
J/C
ABS-ECU
A/T-ECU
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-366
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Check A/T-ECU connector B-19.
Q: Does the MUT-III screen correspond to the illustration?
YES : If the MUT-III screen corresponds to the illustration,
power supply to the A/T-ECU may be suspected
Diagnose the A/T-ECU system.
NO : If the MUT-III screen does not correspond to the
illustration, refer to diagnostics item 3: Check the
CAN_L and H lines for a short circuit (Refer to
).
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