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>
- 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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
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. For details refer to .
|
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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(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. For details refer to .
|
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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
|
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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(1)Disconnect joint connector (CAN1), and measure at the
wiring harness side.
|
|
(2)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(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. For details refer to .
|
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. For details refer to .
|
|
|
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. Resistance measurement at joint connector (CAN3)
<LHD> or joint connector (CAN4)
<RHD>.
|
|
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 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. For details refer to .
|
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. For details refer to .
|
|
|
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
disconnected]
|
|
(1)Disconnect 4WD-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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.
Check the 4WD-ECU connector, and
repair if necessary. If the 4WD-ECU connector 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, and repair if necessary. If the 4WD-ECU connector is
in good condition, replace the 4WD-ECU.
|
|
|
|
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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(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. For details refer to .
|
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. For details refer to .
|
|
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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. For details
refer to .
|
|
|
caution |
The test wiring harness should be used. For details
refer to .
|
|
|
(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. For details refer to .
|
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. For details refer to .
|
|
|
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.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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.
|
|
STEP 25. 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 SRS-ECU connector, and repair if necessary. If the SRS-ECU connector is
in good condition, replace the SRS-ECU.
|
|
|
|
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>.
|
|
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 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. For details refer to .
|
Ensure that the negative battery terminal is disconnected.
|
|
(3)Resistance between joint connector (CAN3) terminal No.9
(CAN_H) and body earth <LHD> OK: 1 kΩ
or more
|
|
(4)Resistance between joint connector (CAN3) terminal No.20
(CAN_L) and body earth <LHD> OK: 1 kΩ
or more
|
|
(5)Resistance between joint connector (CAN4) terminal No.10
(CAN_H) and body earth <RHD> OK: 1 kΩ
or more
|
|
(6)Resistance between joint connector (CAN4) terminal No.21
(CAN_L) and body earth <RHD> OK: 1 kΩ
or more
|
|
(7)
caution |
Strictly observe the specified wiring harness repair
procedure. For details refer to .
|
|
|
Q.
Is the check result normal?
|
|
<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.
|
|
|
|
<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.
|
|
|
|
STEP 27. M.U.T.-III CAN bus diagnostics [engine-ECU connector
disconnected]
|
|
(1)Disconnect engine-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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.
|
|
STEP 28. 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 engine-ECU connector, and repair if necessary. If the engine-ECU
connector is in good condition, replace the engine-ECU.
|
|
|
|
STEP 29. M.U.T.-III CAN bus diagnostics [ETACS-ECU connector
disconnected]
|
|
(1)Disconnect ETACS-ECU connector, and diagnose by using the
M.U.T.-III.
|
![](../../../img/54/ACD01551AB00ENG.png)
|
(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.
|
|
STEP 30. 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 ETACS-ECU connector, and repair if necessary. If the ETACS-ECU
connector is in good condition, replace the ETACS-ECU.
|
|
|