Diagnosis Item
8: Diagnose shorts between CAN_H and L lines (CAN-C-Mid).
caution |
- When servicing
a CAN bus line, earth yourself by touching a metal object such as an
unpainted water pipe. If
you fail to do, a component connected to the CAN bus line may be
broken.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted
code of the ignition
key needs to be registered to the ETACS-ECU. (If the encrypted code is
not registered, the engine
cannot be started. Register the encrypted code as described in GROUP 54A,
Immobilizer System - How
to Register Key ID .)
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TROUBLE JUDGEMENT
When all of the following conditions are met,
the M.U.T.-III determines that a short circuit
is present between CAN_L and CAN_H lines.
- The M.U.T.-III cannot receive the periodic transmission
data from any ECUs.
- The voltage between CAN-C-Mid (CAN_L and CAN_H lines) is 1.0
V
or more, 4.0 V or less.
- The resistance at CAN-C-Mid (CAN_L and CAN_H lines) is 2
Ω or
less.
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the connector
- Malfunction of the ETACS-ECU
- Malfunction of the A/C-ECU
- Malfunction of the KOS-ECU <Vehicles with KOS>
- Malfunction of the OSS-ECU <Vehicles with OSS>
- Malfunction of the radio and CD player <vehicles with radio and CD
player>
- Malfunction of the corner sensor/back sensor-ECU <vehicles
with
reversing sensor system>
- Malfunction of the electric tailgate control unit <vehicles with
electric
tailgate>
- Malfunction of the combination meter
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STEP 1. Connector check: joint connector (CAN5)
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caution |
The strand end of the twist wire should be within
10 cm from
the connector. For details refer to .
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When checking the joint connector, ensure that
its wiring harness side and its short pins
are not damaged.
Q.
Is the check result normal?
Go to Step 2.
Repair a defective connector or
replace the joint connector.
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STEP 2. Resistance measurement at joint connector (CAN5).
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.11
and 22 OK: 120 ± 20 Ω
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<Within 120 ± 20
Ω> Go to Step 4.
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NO : <Not within 120 ±
20 Ω> Go to Step 3.
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STEP 3. Resistance measurement at ETACS-ECU connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the ETACS-ECU, and measure at the equipment
side.
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(2)Resistance between ETACS-ECU connector terminal Nos.16 and
17 OK: 120 ± 20 Ω
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<Within 120 ± 20
Ω> Repair the wiring harness between
joint connector (CAN5) and the ETACS-ECU connector.
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<Not within 120 ± 20
Ω> Check the ETACS-ECU connector,
and repair if necessary. If the ETACS-ECU connector is in good condition,
replace the ETACS-ECU.
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STEP 4. Resistance measurement at joint connector (CAN5).
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.6
and 17 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 6.
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<Less than 1
kΩ> Go to Step 5.
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STEP 5. Resistance measurement at A/C-ECU
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the A/C-ECU, and measure at the equipment
side.
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(2)Resistance between A/C-ECU connector terminal Nos.31
and 32 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the wiring harness between joint
connector (CAN5) and the A/C-ECU connector.
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<Less than 1 kΩ>
Check the A/C-ECU connector,
and repair if necessary. If the A/C-ECU connector is in good
condition, replace the
A/C-ECU.
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STEP 6. Resistance measurement at joint connector (CAN5).
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note |
Steps 6 and 7 are only for vehicles with electric
tailgate. On vehicles without it, go
to Step 8.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.8
and 19 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 8.
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<Less than 1
kΩ> Go to Step 7.
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STEP 7. Resistance measurement at electric tailgate control unit
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the electric tailgate control unit, and measure at
the equipment side.
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(2)Resistance between electric tailgate control unit
connector terminal Nos.7 and
8 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more> Check
the intermediate connector, and
repair if necessary. If the intermediate connector is in good condition,
repair the wiring harness between
joint connector (CAN5) and the electric tailgate control unit
connector.
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<Less than 1 kΩ>
Check the electric tailgate control unit
connector, and repair if necessary. If the electric tailgate control unit
connector is in good
condition, replace the electric tailgate control unit.
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STEP 8. Resistance measurement at joint connector (CAN5).
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note |
Steps 8 and 9 are only for vehicles with reversing
sensor system. On vehicles without
it, go to Step 10.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.4
and 15 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 10.
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<Less than 1
kΩ> Go to Step 9.
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STEP 9. Resistance measurement at corner sensor/back sensor-ECU
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the corner sensor/back sensor-ECU, and
measure at the equipment
side.
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(2)Resistance between corner sensor/back sensor-ECU
connector terminal Nos.19
and 20 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the wiring harness between joint
connector (CAN5) and the corner sensor/back sensor-ECU
connector.
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<Less than 1 kΩ>
Check the corner sensor/back sensor-ECU
connector, and repair if necessary. If the corner sensor/back
sensor-ECU connector
is in good condition, replace the corner sensor/back
sensor-ECU.
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STEP 10. Resistance measurement at joint connector
(CAN5).
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note |
Steps 10 and 11 are only for vehicles with radio
and CD player system. On vehicles without
it, go to Step 12.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect joint connector (CAN5), and measure at the
wiring harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.7
and 18 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 12.
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<Less than 1
kΩ> Go to Step 11.
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STEP 11. Resistance measurement at radio and CD player
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the radio and CD player, and measure at the
equipment side.
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(2)Resistance at radio and CD player connector terminal Nos.3
and 13 OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the wiring harness between joint
connector (CAN5) and the radio and CD player connector.
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<Less than 1 kΩ>
Check the radio and CD player connector,
and repair if necessary. If the radio and CD player connector is in good
condition, replace
the radio and CD player.
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STEP 12. Resistance measurement at joint connector
(CAN5).
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note |
Steps 12 and 13 are only for vehicles with OSS. On
vehicles without it, go to Step 14
.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect joint connector (CAN5), and measure at the
wiring harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.10
and 21 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 14.
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<Less than 1
kΩ> Go to Step 13.
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STEP 13. Resistance measurement at OSS-ECU connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the OSS-ECU, and measure at the equipment
side.
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(2)Resistance at OSS-ECU connector terminal Nos.1 and
14 OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the wiring harness between joint
connector (CAN5) and the OSS-ECU connector.
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<Less than 1 kΩ>
Check the OSS-ECU connector, and repair
if necessary. If the OSS-ECU connector is in good condition, replace the
OSS-ECU.
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STEP 14. Resistance measurement at joint connector
(CAN5).
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note |
Steps 14 and 15 are only for vehicles with KOS. On
vehicles without it, go to Step 16
.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect joint connector (CAN5), and measure at the
wiring harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.5
and 16 OK: 1 kΩ or more
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<1 kΩ or more>
Go to Step 16.
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<Less than 1
kΩ> Go to Step 15.
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STEP 15. Resistance measurement at KOS-ECU connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the KOS-ECU, and measure at the equipment
side.
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(2)Resistance at KOS-ECU connector terminal Nos.2 and
3 OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the wiring harness between joint
connector (CAN5) and the KOS-ECU connector.
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<Less than 1 kΩ>
Check the KOS-ECU connector, and repair
if necessary. If the KOS-ECU connector is in good condition, replace the
KOS-ECU.
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STEP 16. Resistance measurement at joint connector
(CAN5).
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer
to .
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(1)Disconnect joint connector (CAN5), and measure at the
wiring harness side.
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(2)Turn the ignition switch to the LOCK (OFF)
position.
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(3)
caution |
When measuring the resistance, disconnect the
negative battery
terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN5) terminal Nos.9
and 20 OK: 120 ± 20 Ω
caution |
Strictly observe the specified wiring harness repair
procedure.
For details refer to .
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Q.
Is the check result normal?
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<Within 120 ± 20
Ω> The trouble can be an intermittent
malfunction (Refer to GROUP 00 - How to use
Troubleshooting/inspection Service
Points - How to Cope with Intermittent Malfunction ).
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<Not within 120 ± 20
Ω> Go to Step 17.
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STEP 17. Resistance measurement at combination meter
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the combination meter, and measure at the equipment
side.
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(2)Resistance at combination meter connector terminal Nos.14
and 15 OK: 120 ± 20 Ω
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Q.
Is the check result normal?
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<Within 120 ± 20
Ω> Repair the wiring harness between
joint connector (CAN5) and the combination meter connector.
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<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.
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