Diagnosis Item
4: Diagnose shorts between CAN_H and L lines (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
 .)
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TROUBLE JUDGEMENT
- The M.U.T.-III cannot receive the periodic transmission
data from any ECUs.
- The voltage between CAN-C (CAN_L and CAN_H lines) is 1.0 V or
more, 4.0 V or less.
- The resistance at CAN-C (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 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
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STEP 1. Connector check: C-126 intermediate connector
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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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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the defective connector.
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STEP 2. Resistance measurement at C-126 intermediate connector.
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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 intermediate connector
(at the front wiring harness side).
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between C-126 intermediate connector terminal Nos.15 and 16
OK: 120 ± 20 Ω
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Q.
Is the check result normal?
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<Within 120 ± 20 Ω> Go to Step 17.
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<Not within 120 ± 20 Ω> Go to Step 3.
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STEP 3. Connector check: joint connector (CAN1)
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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?
YES <vehicles without ACC> : Go to Step 5.
YES <vehicles with ACC> : Go to Step 4.
Repair a defective connector or replace the joint connector.
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STEP 4. Connector check: 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 5.
Repair a defective connector or replace the joint connector.
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STEP 5. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN1) terminal Nos.10 and 21
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?
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YES <vehicles without ACC> : <Within 120 ± 20 Ω> Go to Step 8.
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YES <vehicles with ACC> : <Within 120 ± 20 Ω> Go to Step 7.
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<Not within 120 ± 20 Ω> Go to Step 6.
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STEP 6. Resistance measurement at engine-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the engine-ECU, and measure at the equipment side.
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(2)Resistance between engine-ECU connector terminal Nos.90 and 91
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?
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<Within 120 ± 20 Ω> Repair the wiring harness between
joint connector (CAN1) and the engine-ECU connector.
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<Not within 120 ± 20 Ω> Check the engine-ECU connector,
and repair if necessary. If the engine-ECU connector is in good condition, replace the engine-ECU.
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STEP 7. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between 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?
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<1 kΩ or more> Go to Step 9.
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<Less than 1 kΩ> Go to Step 8.
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STEP 8. Resistance measurement at ACC/FCM-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the ACC/FCM-ECU, and measure at the equipment side.
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(2)Resistance between ACC/FCM-ECU connector terminal Nos.2 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?
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<1 kΩ or more> Check intermediate connector, and repair
if necessary. If the intermediate connector is in good condition, repair the wiring harness
between joint connector (CAN1) and the ACC/FCM-ECU connector.
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<Less than 1 kΩ> 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.
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STEP 9. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN1) 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?
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<1 kΩ or more> Go to Step 11.
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<Less than 1 kΩ> Go to Step 10.
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STEP 10. Resistance measurement at CVT-ECU <CVT> connector
or A/T-ECU <A/T> connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the CVT-ECU <CVT> or A/T-ECU <A/T>,
and measure at the equipment side.
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(2)Resistance between CVT-ECU connector terminal Nos.4 and 5 <CVT>
OK: 1 kΩ or more
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(3)Resistance between A/T-ECU connector terminal Nos.10 and 11 <A/T>
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?
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<1 kΩ or more> Check intermediate connector, and repair
if necessary. If the intermediate connector is in good condition, repair the wiring harness
between joint connector (CAN1) and the CVT-ECU <CVT> connector or A/T-ECU <A/T> connector.
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<Less than 1 kΩ> 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>.
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STEP 11. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between 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?
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YES <vehicles without AS&G system> : <1 kΩ or more> Go to Step 15.
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YES <vehicles with AS&G system> : <1 kΩ or more> Go to Step 13.
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<Less than 1 kΩ> Go to Step 12.
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STEP 12. Resistance measurement at 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 between EPS-ECU connector terminal Nos.3 and 4
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?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN1) and the EPS-ECU connector.
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<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 13. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN1) terminal Nos.7 and 18
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?
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<1 kΩ or more> Go to Step 15.
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<Less than 1 kΩ> Go to Step 14.
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STEP 14. Resistance measurement at AS&G-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the AS&G-ECU, and measure at the equipment side.
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(2)Resistance between AS&G-ECU connector terminal Nos.1 and 14
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?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN1) and the AS&G-ECU connector.
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<Less than 1 kΩ> 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.
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STEP 15. Resistance measurement at 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 ignition 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 battery terminal is disconnected.
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(4)Resistance between 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?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN1) and C-126 intermediate connector.
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<Less than 1 kΩ> Go to Step 16.
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STEP 16. Resistance measurement at ABS-ECU <vehicles without ASC>
or ASC-ECU <vehicles with ASC> connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC>,
and measure at the equipment side.
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(2)Resistance between ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles
with ASC> connector terminal Nos.11 and 10
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?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN1) and the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC> connector.
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<Less than 1 kΩ> 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>.
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STEP 17. Connector check: joint connector (CAN3) <LHD> or
joint connector (CAN4) <RHD>
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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 18.
Repair a defective connector or replace the joint connector.
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STEP 18. Resistance measurement at joint connector (CAN3).
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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 (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.11 and 22 <LHD>
OK: 120 ± 20 Ω
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(5)Resistance between joint connector (CAN3) terminal Nos.4 and 15 <RHD>
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?
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YES <2WD> : <Within 120 ± 20 Ω> Go to Step 22.
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YES <4WD> : <Within 120 ± 20 Ω> Go to Step 20.
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NO : <Not within 120 ± 20 Ω> Go to Step 19.
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STEP 19. Resistance measurement at 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 ETACS-ECU connector terminal Nos.18 and 19
OK: 120 ± 20 Ω
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Q.
Is the check result normal?
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<Within 120 ± 20 Ω> Repair the wiring harness between
joint connector (CAN3) and the ETACS-ECU connector.
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<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.
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STEP 20. Resistance measurement at joint connector (CAN3).
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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 (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.5 and 16
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?
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<1 kΩ or more> Go to Step 22.
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<Less than 1 kΩ> Go to Step 21.
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STEP 21. Resistance measurement at 4WD-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the 4WD-ECU, and measure at the equipment side.
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(2)Resistance at 4WD-ECU connector terminal Nos.5 and 13
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> Check intermediate connector, and repair
if necessary. If the intermediate connector is in good condition, repair the wiring harness
between joint connector (CAN3) and the 4WD-ECU connector.
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<Less than 1 kΩ> Check the 4WD-ECU connector, and repair
if necessary. If the 4WD-ECU connector is in good condition, replace the 4WD-ECU.
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STEP 22. Resistance measurement at joint connector (CAN3).
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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 (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.6 and 17 <LHD>
OK: 1 kΩ or more
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(5)Resistance between joint connector (CAN3) 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?
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YES <vehicles without LDW> : <1 kΩ or more> Go to Step 26.
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YES <vehicles without LDW> : <1 kΩ or more> Go to Step 24.
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<Less than 1 kΩ> Go to Step 23.
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STEP 23. Resistance measurement at 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 steering wheel sensor connector terminal Nos.3 and 4
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN3) and the steering wheel sensor connector.
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<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 24. Resistance measurement at joint connector (CAN3).
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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 (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.7 and 18
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?
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<1 kΩ or more> Go to Step 26.
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<Less than 1 kΩ> Go to Step 25.
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STEP 25. Resistance measurement at LDW-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the LDW-ECU, and measure at the equipment side.
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(2)Resistance at LDW-ECU connector terminal Nos.2 and 3
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN3) and the LDW-ECU connector.
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<Less than 1 kΩ> Check the LDW-ECU connector, and repair
if necessary. If the LDW-ECU connector is in good condition, replace the LDW-ECU.
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STEP 26. Resistance measurement at joint connector (CAN3).
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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 (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition 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 battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.8 and 19 <LHD>
OK: 1 kΩ or more
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(5)Resistance between joint connector (CAN3) 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?
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<1 kΩ or more> Go to Step 28.
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<Less than 1 kΩ> Go to Step 27.
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STEP 27. Resistance measurement at SRS-ECU connector.
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| caution |
A digital multimeter should be used. For details refer to .
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(1)Remove the SRS-ECU, and measure at the equipment side.
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(2)Resistance at SRS-ECU connector terminal Nos.29 and 30
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN3) and the SRS-ECU connector.
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<Less than 1 kΩ> Check the SRS-ECU connector, and repair
if necessary. If the SRS-ECU connector is in good condition, replace the SRS-ECU.
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STEP 28. Resistance measurement at joint connector (CAN3).
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|
| 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 (CAN3), and measure at the wiring harness side.
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|
(2)Turn the ignition 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 .
|
Ensure that the negative battery terminal is disconnected.
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(4)Resistance between joint connector (CAN3) terminal Nos.9 and 20 <LHD>
OK: 1 kΩ or more
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(5)Resistance between joint connector (CAN3) 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?
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<1 kΩ or more> Repair the wiring harness between joint
connector (CAN3) and the C-126 intermediate connector.
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<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 (CAN3) and the diagnosis connector.
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