Mitsubishi 380. Manual — part 648
TEST EQUIPMENT
CONTROLLER AREA NETWORK (CAN)
54C-3
TEST EQUIPMENT
M1548304300054
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness
adaptor
D: Probe
General service tools Continuity check and voltage
measurement at harness wire or
connector for loose, corroded or
damaged terminals, or terminals
pushed back in the connector.
A: Connector pin contact
pressure inspection
B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection
TOOL
TOOL NUMBER
AND NAME
SUPERSESSION
APPLICATION
MB991223
A
D
C
B
AD
TEST EQUIPMENT
NAME
USE
Digital multimeter
Checking CAN bus circuit (for resistance and voltage
measurements)
AC000019
SERVICE PRECAUTIONS
CONTROLLER AREA NETWORK (CAN)
54C-4
SERVICE PRECAUTIONS
M1548302100043
WARNINGS IN DIAGNOSIS SECTION
DETAILS REGARDING WARNINGS
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
connected to the CAN bus line may be damaged.
−
CAUTION
A digital multimeter should be used.
When measuring resistance value or voltage in
CAN bus lines, use a digital multimeter. If not
using a digital multimeter, the equipment
connected through the CAN communication
lines, may be damaged.
CAUTION
Disconnect the negative battery terminal.
Disconnect the negative battery terminal when
measuring the resistance value in the CAN bus
line. If you fail to do so, a component connected
through the CAN communication lines may be
damaged.
CAUTION
The test wiring harness should be used.
Always use the test harness when measuring the
voltage or resistance value at the female
connector. If you fail to do so, connectors may be
damaged.
CAUTION
The strand end of the twisted wire should be
within 10 cm (4 inches) from the connector.
If you repair the wire due to a defective
connector or its terminal or harness wire, you
should cut the wire so that the strand end of the
twisted wire should be within 10 cm (4 inches)
from the connector as shown. If it exceeds 10cm,
twist the wiring harness just like the original
twisted wire. If the strand end exceeds 10 cm, a
communication error may be caused.
AC203824
CONNECTOR
TWISTED WIRE
AB
10 cm
(4.0 inches)
PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES
CONTROLLER AREA NETWORK (CAN)
54C-5
PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES
M1548301900057
.
Precautions on how to repair the CAN bus lines
• If the CAN_L or CAN_H line on the main bus line or sub-bus
line is repaired, replace all the twisted wires between the
end connectors. If the wiring harness is partially repaired, or
only CAN_L or CAN_H line is repaired, noise suppression is
deteriorated, causing a communication error.
• If the connector or wire on the main bus line or the sub-bus
wire is replaced, the strand end of the twisted wire should
be within 10 cm from the connector. If it exceeds 10 cm,
twist the wiring harness just like the original twisted wire. If
the strand end exceeds 10 cm, noise suppression is deteri-
orated, causing a communication error.
CAUTION
Strictly observe the specified wiring harness
repair procedure.
When you repair a CAN bus line, observe the
precautions on how to repair the CAN bus line
strictly (Refer to
). If a new wire is added
or a splice point is modified for the CAN_L or
CAN_H line, an error in the CAN communication
may be caused.
WARNINGS IN DIAGNOSIS SECTION
DETAILS REGARDING WARNINGS
AC204696
ADDED WIRE
NO GOOD
AB
AC203824
CONNECTOR
TWISTED WIRE
AB
10 cm
(4.0 inches)
EXPLANATION ABOUT THE DIAGNOSTIC TOOL (MUT-III) CAN BUS DIAGNOSTICS
CONTROLLER AREA NETWORK (CAN)
54C-6
• If a sub-bus line is repaired, splice a new wire directly into
the main bus line. If a new wire is spliced into the sub-bus
line, which is connected to another device, the CAN com-
munication will be disabled.
.
Precautions on how to repair the
terminator resistor
If one-side of the terminator resistors is broken, the
CAN communication will continue, although noise
suppression is deteriorated. In this case, no DTC
may be set. Check the system regardless of whether
a DTC is set or not. If damage is found, replace the
terminator resistor.
EXPLANATION ABOUT THE DIAGNOSTIC TOOL (MUT-III)
CAN BUS DIAGNOSTICS
M1548300100058
The MUT-III CAN bus diagnostics carries out the
three checks below automatically, and then displays
the current condition of the CAN bus lines according
to the check results.
AC202856
ECU
ECU
ECU
ECU
GOOD
NO GOOD
OPEN
CIRCUIT
POINT
OPEN
CIRCUIT
POINT
AD
: MAIN BUS LINE
: SUB-BUS LINE
TERMINATOR RESISTOR
TERMINATOR RESISTOR
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