Diagnosis Item
3: Diagnose shorts in the earth to CAN-C.
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.)
|
TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble
when it is impossible to receive the periodically sent
data and the voltage of CAN_H or CAN_L line is less than 1.0
V.
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the connector
- Malfunction of the ETACS-ECU
- Malfunction of the SRS-ECU
- Malfunction of the steering wheel sensor
- Malfunction of the 4WD-ECU <4WD (vehicles without S-AWC)> or
AWC-ECU <vehicles
with S-AWC)>
- Malfunction of the ABS-ECU <vehicles without ASC> or ASC-ECU
<vehicles
with ASC>
- Malfunction of the EPS-ECU
- Malfunction of the CVT-ECU <CVT> or A/T-ECU
<A/T>
- Malfunction of the ACC/FCM-ECU <vehicles with ACC>
- Malfunction of the engine-ECU
|
STEP 1. Check the CAN-C. Resistance measurement at diagnosis
connector.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
note |
This inspection allows you to check that there is a
short to earth in either CAN_H
line or CAN_L line. Thus, in the following steps, check the CAN-C
that is defective.
|
|
|
(1)Disconnect engine-ECU connector and ETACS-ECU connector,
and measure the resistance
at harness side of diagnosis connector.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between diagnosis connector terminal No.6
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between diagnosis connector terminal No.14
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<Both of the measurement
results show 1 kΩ or more> Go
to Step 27.
|
|
|
|
<Either of CAN_H line
or CAN_L line the measurement
results show less than 1 kΩ> Go to Step 2.
|
|
|
|
STEP 2. Check the CAN-C. Resistance measurement at C-126 intermediate
connector.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect the intermediate connector, and measure at its
female-side intermediate
connector (at the front wiring harness side).
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between C-126 intermediate connector terminal
No.15 (CAN_H)
and body earth OK: 1 kΩ or more
|
|
(4)Resistance between C-126 intermediate connector terminal
No.16 (CAN_L)
and body earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 16.
|
|
|
|
<Less than 1 kΩ
> Go to Step 3.
|
|
|
|
STEP 3. Check the CAN-C between joint connector (CAN1) and the
engine-ECU.
Resistance measurement at joint connector (CAN1).
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.10
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN2) terminal No.21
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
YES <vehicles without ACC> : <1
kΩ or more> Go to Step 7.
|
|
|
|
YES <vehicles with ACC> : <1
kΩ or more> Go to Step 4.
|
|
|
|
NO : <Less than 1 kΩ > Repair
the wiring harness between joint
connector (CAN1) and the engine-ECU connector.
|
|
|
|
STEP 4. Check the CAN-C between joint connector (CAN1) and the
ACC/FCM-ECU.
Resistance measurement at joint connector (CAN1).
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.10
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.21
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 7.
|
|
|
|
<Less than 1 kΩ
> Go to Step 5.
|
|
|
|
STEP 5. M.U.T.-III CAN bus diagnostics [ACC/FCM-ECU connector
disconnected]
|
|
(1)Disconnect ACC/FCM-ECU connector, and diagnose by using
the M.U.T.-III.
|
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the ACC/FCM-ECU connector.
Check the
ACC/FCM-ECU connector, and repair if necessary. If the ACC/FCM-ECU
connector
is in good condition, go to Step 6.
|
|
STEP 6. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the ACC/FCM-ECU connector, and repair if necessary. If the ACC/FCM-ECU
connector
is in good condition, replace the ACC/FCM-ECU.
|
|
|
|
STEP 7. Check the CAN-C between joint connector (CAN1) and the CVT-ECU
<CVT> or
A/T-ECU <A/T>. Resistance measurement at joint connector
(CAN1).
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.6
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.17
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 10.
|
|
|
|
<Less than 1 kΩ
> Go to Step 8.
|
|
|
|
STEP 8. M.U.T.-III CAN bus diagnostics [CVT-ECU connector
disconnected]
|
|
(1)Disconnect CVT-ECU <CVT> connector or A/T-ECU
<A/T> connector,
and diagnose by using the M.U.T.-III.
|
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the CVT-ECU <CVT> connector
or A/T-ECU <A/T> connector.
Check the CVT-ECU
<CVT> connector or A/T-ECU <A/T> connector,
and repair if necessary. If the CVT-ECU <CVT> connector or
A/T-ECU <A/T> connector is
in good condition, go to Step 9.
|
|
STEP 9. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the CVT-ECU <CVT> connector or A/T-ECU <A/T>
connector,
and repair if necessary. If the CVT-ECU <CVT> connector or
A/T-ECU <A/T> connector is
in good condition, replace the CVT-ECU <CVT> or A/T-ECU
<A/T>.
|
|
|
|
STEP 10. Check the CAN line between joint connector (CAN1) and the
EPS-ECU. Resistance measurement at joint connector (CAN1).
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.8
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.19
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 13.
|
|
|
|
<Less than 1 kΩ
> Go to Step 11.
|
|
|
|
STEP 11. M.U.T.-III CAN bus diagnostics [EPS-ECU connector
disconnected]
|
|
(1)Disconnect EPS-ECU connector, and diagnose by using the
M.U.T.-III.
|
|
(2)Diagnose CAN-C, and check if M.U.T.-III
screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the EPS-ECU connector.
Check the EPS-ECU connector, and
repair if necessary. If the EPS-ECU connector
is in good condition, go to Step 12.
|
|
STEP 12. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector
is in good condition, replace the EPS-ECU.
|
|
|
|
STEP 13. Check the CAN-C between joint connector (CAN1) and the ABS-ECU
<vehicles
without ASC> or ASC-ECU <vehicles with ASC>. Resistance
measurement
at joint connector (CAN1).
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN1) terminal No.9
(CAN_H) and body
earth OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN1) terminal No.20
(CAN_L) and body
earth OK: 1 kΩ or more
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Repair intermediate connector C-126,
or the wiring harness between joint connector (CAN1) and intermediate
connector C-126.
|
|
|
|
<Less than 1 kΩ
> Go to Step 14.
|
|
|
|
STEP 14. M.U.T.-III CAN bus diagnostics [ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles with ASC> connector
disconnected]
|
|
(1)Disconnect ABS-ECU <vehicles without ASC> or
ASC-ECU <vehicles
with ASC> connector, and diagnose by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C, and check if M.U.T.-III
screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN1) and the ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles with ASC>
connector.
Check the ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles
with ASC> connector, and repair if necessary. If the ABS-ECU
<vehicles without
ASC> or ASC-ECU <vehicles with ASC> connector is in good
condition,
go to Step 15.
|
|
STEP 15. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles
with ASC> connector, and repair if necessary. If the ABS-ECU
<vehicles without
ASC> or ASC-ECU <vehicles with ASC> connector is in good
condition,
replace the ABS-ECU <vehicles without ASC> or ASC-ECU
<vehicles with
ASC>.
|
|
|
|
STEP 16. Check CAN line between joint connector (CAN3)
<LHD> or
joint connector (CAN4) <RHD> and the ETACS-ECU. Resistance
measurement at
joint connector (CAN3) <LHD> or joint connector (CAN4)
<RHD>.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>,
and measure at the wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN3) terminal No.11
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN3) terminal No.22
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN4) terminal No.7
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN4) terminal No.18
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
|
|
|
Q.
Is the check result normal?
|
|
YES <2WD> : <1 kΩ or
more> Go to Step 20.
|
|
|
|
YES <4WD> : <1 kΩ or
more> Go to Step 17.
|
|
|
|
NO : <Less than 1 kΩ > Repair
the wiring harness between joint
connector (CAN3) <LHD> or joint connector (CAN4)
<RHD> and
the ETACS-ECU connector.
|
|
|
|
STEP 17. Check the CAN-C between joint connector (CAN3)
<LHD> or
joint connector (CAN4) <RHD> and the 4WD-ECU <4WD
(vehicles without
S-AWC)> or AWC-ECU <vehicles with S-AWC)>. Resistance
measurement
at joint connector (CAN3) <LHD> or joint connector (CAN4)
<RHD>.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>,
and measure at the wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN3) terminal No.5
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN3) terminal No.16
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN4) terminal No.11
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN4) terminal No.22
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 20.
|
|
|
|
<Less than 1 kΩ
> Go to Step 18.
|
|
|
|
STEP 18. M.U.T.-III CAN bus diagnostics [4WD-ECU connector
<4WD
(vehicles without S-AWC)> or AWC-ECU connector <vehicles with
S-AWC)> disconnected]
|
|
(1)Disconnect 4WD-ECU connector <4WD (vehicles without
S-AWC)> or
AWC-ECU connector <vehicles with S-AWC)>, and diagnose by using
the M.U.T.-III.
|
|
(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Check the intermediate connector, and
repair if necessary. If the intermediate
connector is in good condition, repair the wiring harness between joint
connector (CAN3) <LHD> or
joint connector (CAN4) <RHD> and the 4WD-ECU connector
<4WD (vehicles without
S-AWC)> or AWC-ECU connector <vehicles with
S-AWC)>.
Check the 4WD-ECU connector
<4WD (vehicles without S-AWC)> or
AWC-ECU connector <vehicles with S-AWC)>, and repair if
necessary. If the
4WD-ECU connector <4WD (vehicles without S-AWC)> or AWC-ECU
connector <vehicles
with S-AWC)> is in good condition, go to Step 19.
|
|
STEP 19. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
Check
the 4WD-ECU connector <4WD (vehicles without S-AWC)> or
AWC-ECU connector <vehicles with S-AWC)>, and repair if
necessary. If the
4WD-ECU connector <4WD (vehicles without S-AWC)> or AWC-ECU
connector <vehicles
with S-AWC)> is in good condition, replace the 4WD-ECU <4WD
(vehicles without
S-AWC)> or AWC-ECU <vehicles with S-AWC)>.
|
|
|
|
STEP 20. Check the CAN-C between joint connector (CAN3)
<LHD> or
joint connector (CAN4) <RHD> and the steering wheel sensor.
Resistance measurement
at joint connector (CAN3) <LHD> or joint connector (CAN4)
<RHD>.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>,
and measure at the wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN3) terminal No.6
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN3) terminal No.17
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN4) terminal No.8
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN4) terminal No.19
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 23.
|
|
|
|
<Less than 1 kΩ
> Go to Step 21.
|
|
|
|
STEP 21. M.U.T.-III CAN bus diagnostics [steering wheel sensor
connector disconnected]
|
|
(1)Disconnect steering wheel sensor connector, and diagnose
by using the M.U.T.-III.
|
|
(2)Diagnose CAN-C, and check if M.U.T.-III
screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD> and the steering wheel sensor
connector.
Check the steering wheel sensor
connector, and repair if necessary. If the steering
wheel sensor connector is in good condition, go to Step 22.
|
|
STEP 22. M.U.T.-III CAN bus diagnostics (retest the
system)
|
|
Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
|
|
Q.
Is the check result normal?
|
|
The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
|
|
|
|
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 23. Check the CAN-C between joint connector (CAN3)
<LHD> or
joint connector (CAN4) <RHD> and the SRS-ECU. Resistance
measurement at joint
connector (CAN3) <LHD> or joint connector (CAN4)
<RHD>.
|
|
caution |
A digital multimeter should be used.
|
|
|
caution |
The test wiring harness should be used.
|
|
|
(1)Disconnect joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>,
and measure at the wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN3) terminal No.30
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
|
|
(4)Resistance between joint connector (CAN3) terminal No.29
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
|
|
(5)Resistance between joint connector (CAN4) terminal No.9
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
|
|
(6)Resistance between joint connector (CAN4) terminal No.20
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
|
|
|
Q.
Is the check result normal?
|
|
<1 kΩ or more>
Go to Step 26.
|
|
|
|
<Less than 1 kΩ
> Go to Step 24.
|
|
|
|
STEP 24. M.U.T.-III CAN bus diagnostics [SRS-ECU connector
disconnected]
|
|
(1)Disconnect SRS-ECU connector, and diagnose by using the
M.U.T.-III.
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(2)Diagnose CAN bus lines, and check if
M.U.T.-III screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between
joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD> and the SRS-ECU
connector.
Check the SRS-ECU connector, and
repair if necessary. If the SRS-ECU connector
is in good condition, go to Step 25.
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STEP 25. M.U.T.-III CAN bus diagnostics (retest the
system)
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Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
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Q.
Is the check result normal?
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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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Check
the SRS-ECU connector, and repair if necessary. If the SRS-ECU connector
is in good condition, replace the SRS-ECU.
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STEP 26. Check the CAN-C between joint connector (CAN3)
<LHD> or
joint connector (CAN4) <RHD> and the diagnosis connector.
Resistance measurement
at joint connector (CAN3) <LHD> or joint connector (CAN4)
<RHD>.
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caution |
A digital multimeter should be used.
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caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>,
and measure at the wiring harness side.
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(2)
caution |
When measuring the resistance, disconnect the
negative battery
terminal.
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Ensure that the negative battery terminal is disconnected.
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(3)Resistance between joint connector (CAN3) terminal No.9
(CAN_H) and body
earth <LHD> OK: 1 kΩ or more
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(4)Resistance between joint connector (CAN3) terminal No.20
(CAN_L) and body
earth <LHD> OK: 1 kΩ or more
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(5)Resistance between joint connector (CAN4) terminal No.10
(CAN_H) and body
earth <RHD> OK: 1 kΩ or more
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(6)Resistance between joint connector (CAN4) terminal No.21
(CAN_L) and body
earth <RHD> OK: 1 kΩ or more
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(7)
caution |
Strictly observe the specified wiring harness repair
procedure.
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Q.
Is the check result normal?
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<1 kΩ or more>
Repair the intermediate connector C-126,
or the wiring harness between joint connector (CAN3) <LHD> or
joint connector
(CAN4) <RHD> and the intermediate connector C-126.
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<Less than 1 kΩ >
Repair the diagnosis connector, or the
wiring harness between joint connector (CAN3) <LHD> or joint
connector (CAN4) <RHD> and
the diagnosis connector.
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STEP 27. M.U.T.-III CAN bus diagnostics [engine-ECU connector
disconnected]
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(1)Disconnect engine-ECU connector, and diagnose by using the
M.U.T.-III.
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(2)Diagnose CAN-C, and check if M.U.T.-III
screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
Go to Step
29.
Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, go to Step 28.
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STEP 28. M.U.T.-III CAN bus diagnostics (retest the
system)
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Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
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Q.
Is the check result normal?
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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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Check
the engine-ECU connector, and repair if necessary. If the engine-ECU
connector
is in good condition, replace the engine-ECU.
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STEP 29. M.U.T.-III CAN bus diagnostics [ETACS-ECU connector
disconnected]
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(1)Disconnect ETACS-ECU connector, and diagnose by using the
M.U.T.-III.
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(2)Diagnose CAN-C, and check if M.U.T.-III
screen is as shown in the illustration.
Q.
Does M.U.T.-III screen correspond to the illustration?
The trouble can be an intermittent
malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope
with Intermittent
Malfunction).
Check the ETACS-ECU connector,
and repair if necessary. If the ETACS-ECU connector
is in good condition, go to Step 30.
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STEP 30. M.U.T.-III CAN bus diagnostics (retest the
system)
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Diagnose CAN-C, and check if M.U.T.-III screen
shows normal state.
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Q.
Is the check result normal?
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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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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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