Diagnosis Item
3: Diagnose shorts between CAN_H and L lines
| 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.
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FUNCTION
TROUBLE JUDGEMENT
- The M.U.T.-III cannot receive the periodic transmission
data from any ECUs.
- The voltage between CAN bus lines (CAN_L and CAN_H lines) is 1.0
V or more, 4.0 V or less.
- The resistance at CAN bus line (CAN_L and CAN_H lines) is 2 Ω or
less.
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the connector
- Malfunction of the 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
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STEP 1. Connector check: B-24 joint connector
(CAN1), C-103 joint connector (CAN2)
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| caution |
The strand end of the twist wire should be within 10 cm from
the connector. For details refer to  .
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When checking the joint connector, ensure that its wiring harness side and its short pins
are not damaged.
Q.
Is the check result normal?
 Go to Step 2
 Repair the defective connector.
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STEP 2. Resistance measurement at B-24 joint connector (CAN1)
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect the connector, and measure at its female-side joint connector (CAN1)
(at the instrument panel wiring harness side).
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.11 and 22
OK: 120 ± 20 Ω
Q.
Is the check result normal?
<Within 120 ± 20 Ω> Go to Step 13.
<Not within 120 ± 20 Ω> Go to Step 3.
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STEP 3. Resistance measurement at C-103 joint connector (CAN2).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between C-103 joint connector (CAN2 terminal Nos.8 and 19
OK: 120 ± 20 Ω
Q.
Is the check result normal?
<Within 120 ± 20 Ω> Go to Step 5.
<Not within 120 ± 20 Ω> Go to Step 4.
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STEP 4. Resistance measurement at C-108 EV-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the EV-ECU, and measure at the equipment side.
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(2)Resistance between C-108 EV-ECU connector terminal Nos.54 and 55
OK: 120 ± 20 Ω
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<Within 120 ± 20 Ω> Repair the wiring harness
between joint connector (CAN2) and the EV-ECU connector.
<Not within 120 ± 20 Ω> 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 ).
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STEP 5. Resistance measurement at C-103 joint connector (CAN2).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative battery terminal.
For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between C-103 joint connector (CAN2) terminal Nos.6 and 17
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 7.
<Less than 1 kΩ> Go to Step 6.
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STEP 6. Resistance measurement at E-06 inverter connector.
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| danger |
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. Refer to .
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| danger |
Wear the specified protection equipment during the check.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the inverter, and measure at the equipment side.
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(2)Resistance between E-06 inverter connector terminal Nos.3 and 8
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> 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.
<Less than 1 kΩ> Check the inverter connector, and
repair if necessary. If the inverter connector is in good condition, replace the inverter and
register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles service ).
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STEP 7. Resistance measurement at C-103 joint connector (CAN2).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between C-103 joint connector (CAN2) terminal Nos.9 and 20
OK: 120 ± 20 Ω
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 9.
<Less than 1 kΩ> Go to Step 8.
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STEP 8. Resistance measurement at C-107 BMU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the BMU, and measure at the equipment side.
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(2)Resistance between C-107 BMU connector terminal Nos.6 and 7
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint
connector (CAN2) and the BMU connector.
<Less than 1 kΩ> Check the BMU connector, and repair
if necessary. If the BMU connector is in good condition, replace the BMU.
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STEP 9. Resistance measurement at C-103 joint connector (CAN2).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between C-103 joint connector (CAN2) terminal Nos.7 and 18
OK: 120 ± 20 Ω
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 11.
<Less than 1 kΩ> Go to Step 10.
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STEP 10. Resistance measurement at E-03 on board charger/DC-DC
converter.
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| danger |
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. Refer to .
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| danger |
Wear the specified protection equipment during the check.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the on board charger/DC-DC converter, and measure at the equipment
side.
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(2)Resistance between E-03 on board charger/DC-DC converter connector terminal Nos.06
and 13
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> 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 connector.
<Less than 1 kΩ> 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.
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STEP 11. Connector check: C-103 joint connector (CAN2)
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between C-103 joint connector (CAN1) terminal Nos.10 and 21
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> The trouble can be an intermittent malfunction
(Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How
to Cope with Intermittent Malfunction ).
<Less than 1 kΩ> Go to Step 12.
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STEP 12. Resistance measurement at C-101 A/C control unit.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the compressor/heater controller, and measure at the equipment
side.
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(2)Resistance between C-101 A/C control unit connector terminal Nos.03 and 04
OK: 120 ± 20 Ω
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint
connector (CAN2) and the compressor/heater controller connector.
<Less than 1 kΩ> Check the compressor/heater
controller connector, and repair if necessary. If the compressor/heater controller
connector is in good condition, replace the compressor/heater controller.
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STEP 13. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.7 and 18 <LHD>
OK: 1 kΩ or more
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(5)Resistance between B-24 joint connector (CAN1) terminal Nos.6 and 17 <RHD>
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<Within 120 ± 20 Ω> Go to Step 15.
<Not within 120 ± 20 Ω> Go to Step 14.
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STEP 14. Resistance measurement at B-317 ETACS-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the ETACS-ECU, and measure at the equipment side.
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(2)Resistance at B-317 ETACS-ECU connector terminal Nos.56 and 65
OK: 120 ± 20 Ω
Q.
Is the check result normal?
<Within 120 ± 20 Ω> Repair
the wiring harness between joint connector (CAN1) and the ETACS-ECU connector.
<Not within 120 ± 20 Ω> Check the
ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, replace
the ETACS-ECU and register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles
service ).
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STEP 15. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.6 and 17 <LHD>
OK: 1 kΩ or more
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(5)Resistance between B-24 joint connector (CAN1) terminal Nos.5 and 16 <RHD>
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 17.
<Less than 1 kΩ> Go to Step 16.
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STEP 16. Resistance measurement at B-101 combination meter connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the combination meter, and measure at the equipment side.
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(2)Resistance at B-101 combination meter connector terminal Nos.17 and 18
OK: 1 kΩ or more
Q.
Is the check result normal?
<1 kΩ or more> 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.
<Less than 1 kΩ> Check the combination meter connector,
and repair if necessary. If the combination meter connector is in good condition, replace the
combination meter.
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STEP 17. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliarybattery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.9 and 20
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 19.
NO  : <Less than 1 kΩ> Go to Step 18.
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STEP 18. Resistance measurement at A-14 ASC-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Connect special tool MB991951 to the ASC-ECU connector, and measure by using the check
connector (connect the ECU side only).
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(2)Measure the resistance between special tool MB991951 check connector terminal Nos. 14
and 26.
OK: 1 kΩ or more
Q.
Is the check result normal?
<1 kΩ or more> 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.
<Less than 1 kΩ> Check the ASC-ECU connector, and repair
if necessary. If the ASC-ECU connector is in good condition, replace the ASC-ECU.
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STEP 19. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.8 and 19
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 21.
<Less than 1 kΩ> Go to Step 20.
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STEP 20. Resistance measurement at B-114 EPS-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the EPS-ECU, and measure at the equipment side.
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(2)Resistance at B-114 EPS-ECU connector terminal Nos.5 and 6
OK: 1 kΩ or more
Q.
Is the check result normal?
<1 kΩ or more> 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.
<Less than 1 kΩ> Check the EPS-ECU connector, and repair
if necessary. If the EPS-ECU connector is in good condition, replace the EPS-ECU.
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STEP 21. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.5 and 16 <LHD>
OK: 1 kΩ or more
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(5)Resistance between B-24 joint connector (CAN1) terminal Nos.4 and 15 <RHD>
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 23.
NO : <Less than 1 kΩ> Go to Step 22.
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STEP 22. Resistance measurement at B-204 steering wheel sensor connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the steering wheel sensor, and measure at the equipment side.
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(2)Resistance at B-204 steering wheel sensor connector terminal Nos.3 and 4
OK: 1 kΩ or more
Q.
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint
connector (CAN2) and the steering wheel sensor connector.
<Less than 1 kΩ> 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.
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STEP 23. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.4 and 15 <LHD>
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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(5)Resistance between B-24 joint connector (CAN1) terminal Nos.3 and 14 <RHD>
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Q.
Is the check result normal?
<1 kΩ or more> Go to Step 25.
<Less than 1 kΩ> Go to Step 24.
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STEP 24. Resistance measurement at C-20 G and yaw rate sensor connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the G and yaw rate sensor, and measure at the equipment side.
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(2)Resistance at C-20 G and yaw rate sensor connector terminal Nos.2 and 3
OK: 1 kΩ or more
Q.
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint
connector (CAN1) and the G and yaw rate sensor connector.
<Less than 1 kΩ> Check the G and yaw rate sensor connector,
and repair if necessary. If the G and yaw rate sensor connector is in good condition, replace
the G and yaw rate sensor.
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STEP 25. Resistance measurement at B-24 joint connector (CAN1).
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| caution |
A digital multimeter should be used. For details refer to .
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| caution |
The test wiring harness should be used. For details refer
to .
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(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.
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(2)Turn the electric motor switch to the LOCK (OFF) position.
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(3)
| caution |
When measuring the resistance, disconnect the negative auxiliary
battery terminal. For details refer to .
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Ensure that the negative auxiliary battery terminal is disconnected.
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(4)Resistance between B-24 joint connector (CAN1) terminal Nos.10 and 21
OK: 1 kΩ or more
| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
|
Q.
Is the check result normal?
<1 kΩ or more> The trouble can be an intermittent malfunction
(Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How
to Cope with Intermittent Malfunction ).
<Less than 1 kΩ> Check the diagnosis connector, and
repair if necessary. If the diagnosis connector is in good condition, repair the wiring harness
between joint connector (CAN1) and the diagnosis connector.
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