Diagnosis Item
1: Diagnose shorts in the power supply to CAN bus line
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.
FUNCTION
When diagnosing the CAN bus lines, the M.U.T.-III measures the voltage of CAN_H
and CAN_L line and detects the short to power supply or earth.
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 more than 4.0 V.
TROUBLESHOOTING HINTS
Malfunction of the wiring harness
Malfunction of the connector
Malfunction of the EV-ECU
Malfunction of the inverter
Malfunction of the BMU
Malfunction of the on board charger/DC-DC converter
Malfunction of the A/C control unit
Malfunction of the ETACS-ECU
Malfunction of the combination meter
Malfunction of the ASC-ECU
Malfunction of the EPS-ECU
Malfunction of the steering wheel sensor
Malfunction of the G and yaw rate sensor
DIAGNOSIS PROCEDURE
STEP 1. Check the CAN bus lines. Voltage measurement at B-20
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 power supply in either CAN_H
line or CAN_L line. Thus, in the following steps, check the CAN bus line that is defective.
(1)Disconnect EV-ECU connector C-108 and ETACS-ECU connector B-317, and measure the
voltage at the harness side of diagnosis connector B-20.
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-20 diagnosis connector terminal No.6 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between B-20 diagnosis connector terminal No.14 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
Q.
Is the check result normal?
<Both of the measurement results show 4.0 V or less> Go
to Step 2
<Either of CAN_H line or CAN_L line
the measurement results show more than 4.0 V> Go to Step 6
STEP 2. M.U.T.-III CAN bus diagnostics (EV-ECU connector disconnected)
(1)Disconnect EV-ECU connector C-108 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?
<M.U.T.-III indications correspond to the illustration> Go
to Step 4 .
<M.U.T.-III indications do not correspond to the illustration> Check
the EV-ECU connector, and repair if necessary. If the EV-ECU connector is in good condition,
go to Step 3
STEP 3. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 EV-ECU connector, and repair if necessary. If the EV-ECU connector is
in good condition, replace the EV-ECU and register the ID codes (Refer to GROUP 54A, Immobilizer
system - On-vehicles service ).
STEP 4. M.U.T.-III CAN bus diagnostics (ETACS-ECU connector disconnected)
(1)Disconnect ETACS-ECU connector B-317, 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?
<M.U.T.-III indications correspond to the illustration> The
trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
<M.U.T.-III indications do not correspond to the illustration> Check
the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition,
go to Step 5.
STEP 5. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 and register the ID codes (Refer to GROUP 54A, Immobilizer
system - On-vehicles service ).
STEP 6. Check the CAN line. Voltage measurement at B-24 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 the joint connector (CAN1), and measure at its male-side joint connector
(at the control wiring harness side).
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.11 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.22 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
Q.
Is the check result normal?
<4.0 V or less> Go to Step 20.
<More than 4.0 V> Go to Step 7.
STEP 7. Check the CAN line between joint connector (CAN2) and the
EV-ECU. Voltage measurement at C-103 joint connector (CAN2).
caution
A digital multimeter should be used. For details refer to .
caution
The test wiring harness should be used. For details refer
to .
(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between C-103 joint connector (CAN2) terminal No.8 (CAN_H) and body earth. OK: 4.0 V or less
(4)Voltage between C-103 joint connector (CAN2) terminal No.19 (CAN_L) and body
earth. OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 8.
NO : <More than 4.0 V> Repair the wiring harness between joint connector
(CAN2) and the EV-ECU connector.
STEP 8. Check the CAN line between joint connector (CAN2) and the
inverter. Voltage measurement at C-103 joint connector (CAN2).
caution
A digital multimeter should be used. For details refer to .
caution
The test wiring harness should be used. For details refer
to .
(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between C-103 joint connector (CAN2) terminal No.6 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between C-103 joint connector (CAN2) terminal No.17 (CAN_L) and body
earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 11.
<More than 4.0 V> Go to Step 9.
STEP 9. M.U.T.-III CAN bus diagnostics (inverter connector disconnected)
(1)Disconnect inverter connector E-06, 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?
<M.U.T.-III indications correspond to the illustration> Prior
to the wiring harness inspection, check C-102 intermediate connector, and repair if necessary.
Repair the wiring harness between joint connector (CAN2) and the inverter connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the inverter connector, and repair if necessary. If the inverter connector is in good condition,
go to Step 10.
STEP 10. M.U.T.-III CAN bus diagnostics (retest the system)
danger
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. Refer to .
danger
Wear the specified protection equipment during the check.
Diagnose CAN bus lines, 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 MCU connector, and repair if necessary. If the MCU connector is in good
condition, replace the MCU and register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles
service ).
STEP 11. Check the CAN line between joint connector (CAN2) and the
BMU. Voltage measurement at C-103 joint connector (CAN2).
caution
A digital multimeter should be used. For details refer to .
caution
The test wiring harness should be used. For details refer
to .
(1)Disconnect joint connector (CAN2), and measure at the wiring harness
side.
(2)Connect the negative auxiliary battery terminal, and turn the electric
motor switch to the ON position.
(3)Voltage between C-103 joint connector (CAN2) terminal No.9 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between C-103 joint connector (CAN2) terminal No.20 (CAN_L) and body
earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 14.
NO : <More than 4.0 V> Go to Step 12.
STEP 12. M.U.T.-III CAN bus diagnostics (BMU connector disconnected)
(1)Disconnect BMU connector C-107, 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?
<M.U.T.-III indications correspond to the illustration> Repair
the wiring harness between joint connector (CAN2) and the BMU connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the BMU connector, and repair if necessary. If the BMU connector is in good condition, go to
Step 13.
STEP 13. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 BMU connector, and repair if necessary. If the BMU connector is in good
condition, replace the BMU.
STEP 14. Check the CAN line between joint connector (CAN2) and the
on board charger/DC-DC converter. Voltage measurement at C-103 joint connector (CAN2).
caution
A digital multimeter should be used. For details refer to .
caution
The test wiring harness should be used. For details refer
to .
(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between C-103 joint connector (CAN2) terminal No.7 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between C-103 joint connector (CAN2) terminal No.18 (CAN_L) and body
earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
Q.
Is the check result normal?
<4.0 V or less> Go to Step 17.
NO : <More than 4.0 V> Go to Step 15.
STEP 15. M.U.T.-III CAN bus diagnostics (on board charger/DC-DC
converter connector disconnected)
(1)Disconnect on board charger/DC-DC converter connector E-03, 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?
<M.U.T.-III indications correspond to the illustration> Prior
to the wiring harness inspection, check C-102 intermediate connector, and repair if necessary.
Repair the wiring harness between joint connector (CAN2) and the on board charger/DC-DC
converter connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the on board charger/DC-DC converter connector, and repair if necessary. If the on
board charger/DC-DC converter connector is in good condition, go to Step 16.
STEP 16. M.U.T.-III CAN bus diagnostics (retest the system)
danger
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. Refer to .
danger
Wear the specified protection equipment during the check.
Diagnose CAN bus lines, 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 on board charger/DC-DC converter connector, and repair if necessary.
If the on board charger/DC-DC converter connector is in good condition, replace the
on board charger/DC-DC converter.
STEP 17. Check the CAN line between joint connector (CAN2) and the
A/C control unit. Voltage measurement at C-103 joint connector (CAN2).
caution
A digital multimeter should be used. For details refer to .
caution
The test wiring harness should be used. For details refer
to .
(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between C-103 joint connector (CAN2) terminal No.10 (CAN_H) and body
earth OK: 4.0 V or less
(4)Voltage between C-103 joint connector (CAN2) terminal No.21 (CAN_L) and body
earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Repair the wiring harness between
joint connector (CAN1) and the joint connector (CAN2).
NO : <More than 4.0 V> Go to Step 18.
STEP 18. M.U.T.-III CAN bus diagnostics (A/C control unit connector
disconnected)
(1)Disconnect A/C control unit connector C-101, 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?
<M.U.T.-III indications correspond to the illustration> Repair
the wiring harness between joint connector (CAN2) and the A/C control unit connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the A/C control unit connector, and repair if necessary. If the A/C control unit connector is
in good condition, go to Step 19.
STEP 19. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.
Q.
Is the check result normal?
Repair the wiring harness between joint connector (CAN1) and the joint connector
(CAN2).
Check the A/C control unit connector, and repair if necessary. If the A/C control
unit connector is in good condition, replace the A/C control unit.
STEP 20. Check the CAN line between joint connector (CAN1) and the
ETACS-ECU. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.6 (CAN_H) and body earth <LHD> OK: 4.0 V or less
(4)Voltage between B-10 joint connector (CAN1) terminal No.17 (CAN_L) and body earth <LHD> OK: 4.0 V or less
(5)Voltage between B-24 joint connector (CAN1) terminal No.7 (CAN_H) and body earth <RHD> OK: 4.0 V or less
(6)Voltage between B-10 joint connector (CAN1) terminal No.18 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 21.
<More than 4.0 V> Repair the wiring harness between
joint connector (CAN1) and the ETACS-ECU connector.
STEP 21. Check the CAN line between joint connector (CAN1) and the
combination meter. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.6 (CAN_H) and body earth <LHD> OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.17 (CAN_L) and body earth <LHD> OK: 4.0 V or less
(5)Voltage between B-24 joint connector (CAN1) terminal No.5 (CAN_H) and body earth <RHD> OK: 4.0 V or less
(6)Voltage between B-24 joint connector (CAN1) terminal No.16 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 24.
<More than 4.0 V> Go to Step 22.
STEP 22. M.U.T.-III CAN bus diagnostics (combination meter connector
disconnected)
(1)Disconnect combination meter connector B-101, 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.
Do the M.U.T.-III indications correspond to the illustration?
<M.U.T.-III indications correspond to the illustration> Prior
to the wiring harness inspection, check B-120 intermediate connector, and repair if necessary.Repair
the wiring harness between joint connector (CAN1) and the combination meter connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the combination meter connector, and repair if necessary. If the combination meter connector
is in good condition, go to Step 23.
STEP 23. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 combination meter connector, and repair if necessary. If the combination
meter connector is in good condition, replace the combination meter.
STEP 24. Check the CAN line between joint connector (CAN1) and the
ASC-ECU. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
switch to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.9 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.20 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 27.
<More than 4.0 V> Go to Step 25.
STEP 25. M.U.T.-III CAN bus diagnostics (ASC-ECU connector disconnected)
(1)Disconnect ASC-ECU connector A-14, 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?
<M.U.T.-III indications correspond to the illustration> Prior
to the wiring harness inspection, check B-01 intermediate connector, and repair if necessary.
Repair the wiring harness between joint connector (CAN1) and the ASC-ECU connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the ASC-ECU connector, and repair if necessary. If the ASC-ECU connector is in good condition,
go to Step 26.
STEP 26. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 ASC-ECU connector, and repair if necessary. If the ASC-ECU connector
is in good condition, replace the ASC-ECU.
STEP 27. Check the CAN line between joint connector (CAN1) and the
EPS-ECU. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
switch to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.8 (CAN_H) and body earth OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.19 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 30.
NO : <More than 4.0 V> Go to Step 28.
STEP 28. M.U.T.-III CAN bus diagnostics (EPS-ECU connector
disconnected)
(1)Disconnect EPS-ECU connector B-114, 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?
<M.U.T.-III indications correspond to the illustration> Prior
to the wiring harness inspection, check B-27 intermediate connector, and repair if necessary.
Repair the wiring harness between joint connector (CAN1) and the EPS-ECU connector.
<M.U.T.-III indications do not correspond to the illustration> Check
the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector is in good condition,
go to Step 29.
STEP 29. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, 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 30. Check the CAN line between joint connector (CAN1)
and the steering wheel sensor. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.5 (CAN_H) and body earth <LHD> OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.16 (CAN_L) and body earth <LHD> OK: 4.0 V or less
(5)Voltage between B-24 joint connector (CAN1) terminal No.4 (CAN_H) and body earth <RHD> OK: 4.0 V or less
(6)Voltage between B-24 joint connector (CAN1) terminal No.15 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 32.
NO : <More than 4.0 V> Go to Step 31.
STEP 31. M.U.T.-III CAN bus diagnostics (steering
wheel sensor connector disconnected)
(1)Disconnect steering wheel sensor connector B-204, 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 steering wheel
sensor connector.
Check the steering wheel sensor connector, and repair if necessary. If the steering
wheel sensor connector is in good condition, repair the steering wheel sensor power supply circuit.
STEP 32. Check the CAN line between joint connector (CAN1) and the
G and yaw rate sensor. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.4 (CAN_H) and body earth <LHD> OK: 4.0 V or less
(4)Voltage between B-24 joint connector (CAN1) terminal No.15 (CAN_L) and body earth <LHD> OK: 4.0 V or less
(5)Voltage between B-24 joint connector (CAN1) terminal No.3 (CAN_H) and body earth <RHD> OK: 4.0 V or less
(6)Voltage between B-24 joint connector (CAN1) terminal No.14 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<4.0 V or less> Go to Step 34.
NO : <More than 4.0 V> Go to Step 33.
STEP 33. M.U.T.-III CAN bus diagnostics (G and yaw rate sensor connector
disconnected)
(1)Disconnect G and yaw rate sensor connector C-20, 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 G and yaw rate
sensor connector.
Check the G and yaw rate sensor connector, and repair if necessary. If the G and
yaw rate sensor connector is in good condition, repair the G and yaw rate sensor power supply
circuit.
STEP 34. Check the CAN line between joint connector (CAN1)
and the diagnosis connector. Voltage measurement at B-24 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)Connect the negative auxiliary battery terminal, and turn the electric motor switch
to the ON position.
(3)Voltage between B-24 joint connector (CAN1) terminal No.10 (CAN_H) and body earth OK: Less than 4.0 V
(4)Voltage between B-10 joint connector (CAN1) terminal No.21 (CAN_L) and body earth OK: Less than 4.0 V (5)Disconnect the negative auxiliary battery terminal.
caution
Strictly observe the specified wiring harness repair procedure.
For details refer to .
Q.
Is the check result normal?
<Less than 4.0 V> The trouble can be an intermittent malfunction
(Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How
to Cope with Intermittent Malfunction ).
<4.0 V or more> Repair the wiring harness between joint connector
(CAN1) and the diagnosis connector.
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<Both of the measurement results show 4.0 V or less> Go
to Step 2
<Either of CAN_H line or CAN_L line
the measurement results show more than 4.0 V> Go to Step 6)
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: <More than 4.0 V> Go to Step 12.)
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