Mitsubishi Colt Ralliart. Manual — part 305
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54D-49
FUNCTION
The M.U.T.-III judges a short between CAN_H and
CAN_L line when all data from ECU cannot be
received while checking periodically sent data from
each ECU even if the voltage is normal.
TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble when it is impossi-
ble to send and receive the all ECU periodically sent
data and the voltage of CAN_H and CAN_L line is
4.0 volts or less and 1.0 volt or more.
POSSIBLE CAUSES
• Malfunction of the wiring harness
• Malfunction of the connector
• Malfunction of each ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-01 joint connector
(CAN2), B-03 joint connector (CAN1), B-40
intermediate connector
AC313820
Connectors: B-01, B-03, B-40
B-40
B-40
AN
B-01
B-03
B-01, B-03
CAUTION
The strand end of the twist wire should be within
10 cm from the connector. For details refer to
.
When checking the joint connector, ensure that its
wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Resistance measurement at the B-40
intermediate connector.
CAUTION
A digital multimeter should be used. For details
refer to
CAUTION
The test wiring harness should be used. For
details refer to
.
AC313820
Connector: B-40
AD
(1) Disconnect the connector, and measure at its
female-side intermediate connector (at the front
wiring harness side).
(2) Turn the ignition switch to the OFF (LOCK)
position.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
.
(3) Ensure that the negative battery terminal is
disconnected.
AC313936 AB
Female side: B-40
Test
harness
Test
harness
(4) Resistance between B-40 intermediate connector
terminal Nos.3 and 4
OK: 120
± 20 Ω
Q: Is the check result normal?
YES :
<Within 120
± 20 Ω> Go to Step 3.
NO :
<Not within 120
± 20 Ω>Go to Step 7.
Main
Index
Group
TOC
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54D-50
STEP 3. Resistance measurement at the B-03
joint connector (CAN1).
CAUTION
A digital multimeter should be used. For details
refer to
CAUTION
The test wiring harness should be used. For
details refer to
AC313820
Connector: B-03
AE
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the OFF (LOCK)
position.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
.
(3) Ensure that the negative battery terminal is
disconnected.
AC313936
AC313936AD
Test
harness
Test
harness
Harness side: B-03
(4) Resistance between B-03 joint connector (CAN1)
terminal Nos.2 and 4
OK: 1 k
Ω or more
AC313936
AC313936AC
Harness side: B-03
Test
harness
Test
harness
(5) Resistance between B-03 joint connector (CAN1)
terminal Nos.3 and 8
OK: 120
± 20 Ω
AC313936
AC313936AE
Harness side: B-03
Test
harness
Test
harness
(6) Resistance between B-03 joint connector (CAN1)
terminal Nos.7 and 11
OK: 1 k
Ω or more
AC204738
AC204738
AC204738
AC204738
AC204738NI
Harness side: B-03
Test harness
Test
harness
(7) Resistance between B-03 joint connector (CAN1)
terminal Nos. 6 and 12 <vehicles with ASC>
OK: 1 k
Ω or more
Main
Index
Group
TOC
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54D-51
Q: Is the check result normal?
YES <all of the measurement results are within the
normal value> :
Repair the wiring harness
between joint connector (CAN1) and
intermediate connector (B-40).
NO <The resistance between terminal Nos.2 and 4
is less than 1 k
Ω> :
Check the diagnosis
connector, and repair if necessary. If the
diagnosis connector is in good condition,
repair the wiring harness between joint
connector (CAN1) and diagnosis connector.
NO <The resistance between terminal Nos.3 and 8
is less than 120
± 20 Ω> :
Go to Step 4.
NO <The resistance between terminal Nos.6 and 12
is less than 120
± 20 Ω> :
Go to Step 6.
NO <The resistance between terminal Nos.7 and 11
is less than 120
± 20 Ω> :
Go to Step 5.
STEP 4. Resistance measurement at B-15
combination meter connector.
CAUTION
A digital multimeter should be used. For details
refer to
AC401055
AE
Connector: B-15
B-15 (B)
Harness side
(1) Remove the combination meter, and measure at
the equipment side.
AC204738FM
Equipment side: B-15
Test
harness
Test
harness
(2) Resistance between B-15 combination meter
connector terminal Nos.1 and 2
OK: 120
± 20 Ω
Q: Is the check result normal?
YES :
<Within 120
± 20 Ω> Repair the wiring
harness between joint connector (CAN1)
and combination meter connector.
NO :
<Not within 120
± 20 Ω> Check the
combination meter connector, and repair if
necessary. If the combination meter
connector is in good condition, replace the
combination meter.
STEP 5. Resistance measurement at B-133
ETACS-ECU connector.
CAUTION
A digital multimeter should be used. For details
refer to
AC313826 AB
Connector: B-133
Harness side
B-133 (GR)
(1) Remove the ETACS-ECU, and measure at the
equipment side.
AC204738 FN
68
74
66
65
7273
67
5657
59
58
63
61
70 71
62
53
52
5455
64
69
60
51
Equipment side: B-133
Test
harness
Test
harness
(2) Resistance between B-133 ETACS-ECU
connector terminal Nos.56 and 65
OK: 1 k
Ω or more
Q: Is the check result normal?
YES :
<1 k
Ω or more> Repair the wiring harness
between joint connector (CAN1) and
ETACS-ECU connector.
NO :
<Less than 1 k
Ω> Check the ETACS-ECU
connector, and repair if necessary. If the
ETACS-ECU connector is in good condition,
replace the ETACS-ECU.
Main
Index
Group
TOC
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54D-52
STEP 6. Resistance measurement at B-142
steering wheel sensor connector.
CAUTION
A digital multimeter should be used. For details
refer to
AC601077AB
Connector: B-142
Harness side
(1) Remove the steering wheel sensor, and measure
at the equipment side.
AC204738
AC204738
AC204738NJ
Equipment side: B-142
Test
harness
Test
harness
(2) Resistance between B-142 steering wheel sensor
connector terminal Nos.4 and 6
OK: 1 k
Ω or more
Q: Is the check result normal?
YES :
<1 k
Ω or more> Repair the wiring harness
between joint connector (CAN1) and
steering wheel sensor connector.
NO :
<Less than 1 k
Ω> Check the steering wheel
sensor connector, and repair if necessary. If
the steering wheel sensor connector is in
good condition, replace the steering wheel
sensor.
STEP 7. Resistance measurement at the B-01
joint connector (CAN2).
CAUTION
A digital multimeter should be used. For details
refer to
CAUTION
The test wiring harness should be used. For
details refer to
.
AC313820AF
Connector: B-01
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the OFF (LOCK)
position.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
.
(3) Ensure that the negative battery terminal is
disconnected.
AC204738
AC204738
AC204738
AC204738
AC204738NK
Harness side: B-01
Test
harness
Test harness
(4) Resistance between B-01 joint connector (CAN2)
terminal Nos.1 and 5 <vehicles with ASC>
OK: 1 k
Ω or more
Main
Index
Group
TOC
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