Mitsubishi 380. Manual — part 726
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-315
STEP 10. Check the CAN bus lines between the A/T-ECU
and the ENGINE-ECU (communication line including the
ENGINE-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 wiring harness side of A/T-ECU connector
B-19.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
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
terminals 4 and 5.
OK: 120
± 20 Ω
Q: Does the resistance measure 120
± 20 Ω?
YES : If the resistance measures 120
± 20 Ω, diagnose CAN
bus lines thoroughly by referring to
<Vehicles with multi-center display >.
NO : If the resistance does not measure 120
± 20 Ω, go to
Step 11 .
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB509A
HARNESS SIDE: B-19
TEST
HARNESS
TEST
HARNESS
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-316
STEP 11. Check the CAN bus lines (communication line
only) between A/T-ECU and the ENGINE-ECU. Measure the
resistance between A/T-ECU connector B-19 and
ENGINE-ECU connector B-21.
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.
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
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 ENGINE-ECU
connector B-21, and measure the resistance between each
wiring harness side connector.
(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.
16DB480A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
A/T
CONTROL
UNIT
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-317
(4) Measure the resistance between A/T-ECU connector B-19
terminal 5 and ENGINE-ECU B-21 connector terminal 86.
OK: 2 ohms or less
(5) Measure the resistance between A/T-ECU connector B-19
terminal 4 and ENGINE-ECU B-21 connector 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 12.
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-318
STEP 12. Check the terminator resistor inside the
ENGINE-ECU. Measure the resistance at ENGINE-ECU
connector B-21.
CAUTION
A digital multimeter should be used. For details refer to
(1) Disconnect ENGINE-ECU connector B-21, and measure
the resistance at the component side of ENGINE-ECU
connector B-21.
(2) Measure the resistance between ENGINE-ECU connector
B-21 terminals 64 and 86.
OK: 120
± 20 Ω
Q: Does the resistance measure 120
± 20 Ω?
YES : If the resistance measures 120
± 20 Ω, go to Step 13.
NO : If the resistance does not measure 120
± 20 , replace
the ENGINE-ECU.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
16DB512A
COMPONENT SIDE: B-21
TEST
HARNESS
TEST
HARNESS
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