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 LDW-ECU <vehicles with LDW>
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 AS&G-ECU <vehicles with AS&G system>
Malfunction of the ACC/FCM-ECU <vehicles with ACC>
Malfunction of the engine-ECU
DIAGNOSIS PROCEDURE
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 33.
<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 19.
<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.
(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.
(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?
YES <vehicles without AS&G system> : <1 kΩ or more> Go to Step 16.
YES <vehicles with AS&G system> : <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 line between joint connector (CAN1) and the
AS&G-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.7 (CAN_H) and body
earth OK: 1 kΩ or more
(4)Resistance between joint connector (CAN1) terminal No.18 (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 14.
STEP 14. M.U.T.-III CAN bus diagnostics [AS&G-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 AS&G-ECU
connector.
Check the AS&G-ECU connector, and repair if necessary. If the AS&G-ECU
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 AS&G-ECU connector, and repair if necessary. If the AS&G-ECU
connector is in good condition, replace the AS&G-ECU.
STEP 16. 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 17.
STEP 17. 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 18.
STEP 18. 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 19. 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 23.
YES <4WD> : <1 kΩ or more> Go to Step 20.
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 20. 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 23.
<Less than 1 kΩ > Go to Step 21.
STEP 21. 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.
(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 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 4WD-ECU connector, and repair if necessary. If the 4WD-ECU connector
is in good condition, replace the 4WD-ECU.
STEP 23. 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?
YES <vehicles without LDW> : <1 kΩ or more> Go to Step 29.
YES <vehicles with LDW> : <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 [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 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 steering wheel sensor connector, and repair if necessary. If the steering
wheel sensor connector is in good condition, replace the steering wheel sensor.
STEP 26. Check the CAN-C between joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD> and the LDW-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.7 (CAN_H) and body
earth <LHD> OK: 1 kΩ or more
(4)Resistance between joint connector (CAN3) terminal No.18 (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 29.
<Less than 1 kΩ > Go to Step 27.
STEP 27. M.U.T.-III CAN bus diagnostics [LDW-ECU connector
disconnected]
(1)Disconnect LDW-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 (CAN3) <LHD> or
joint connector (CAN4) <RHD> and the LDW-ECU connector.
Check the LDW-ECU connector, and repair if necessary. If the LDW-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 LDW-ECU connector, and repair if necessary. If the LDW-ECU connector
is in good condition, replace the LDW-ECU.
STEP 29. 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 32.
<Less than 1 kΩ > Go to Step 30.
STEP 30. 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.
(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 31.
STEP 31. 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 32. 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 33. 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.
(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 35.
Check the engine-ECU connector, and repair if necessary. If the engine-ECU connector
is in good condition, go to Step 34.
STEP 34. 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 35. 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.
(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 36.
STEP 36. 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.