Diagnosis Item 11: Diagnose the lines between CAN_L and CAN_H for short circuit <Vehicles without A/C and with TCL/ASC system>


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.



TROUBLE JUDGMENT


Short circuit may be present between the CAN_L and H lines when the resistance between the CAN bus lines (CAN_L and H lines) is less than 2 Ω.

COMMENTS ON TROUBLE SYMPTOM


The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or an ECU may be defective.

TROUBLESHOOTING HINTS



DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-118 intermediate connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

STEP 2. Resistance measurement at the B-118 intermediate connector.
caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .


(1)Disconnect the connector, and measure at its female-side intermediate connector (at the front wiring harness side).
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between B-118 intermediate connector terminal Nos.12 and 13
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 3.

<Not within 120 ± 20 Ω> Go to Step 20.

STEP 3. Connector check: B-03 joint connector (CAN1)


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

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 4.

Repair a defective connector or replace the joint connector.

STEP 4. Resistance measurement at B-03 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 connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between B-03 joint connector (CAN1) terminal Nos.4 and 15
OK: 120 ± 20 Ω

(5)Resistance between B-03 joint connector (CAN1) terminal Nos.5 and 16
OK: 1 kΩ or more

(6)Resistance between B-03 joint connector (CAN1) terminal Nos.7 and 18
OK: 1 kΩ or more

(7)Resistance between B-03 joint connector (CAN1) terminal Nos.9 and 20
OK: 1 kΩ or more

(8)Resistance between B-03 joint connector (CAN1) terminal Nos.10 and 21
OK: 1 kΩ or more

Q. Are the check results normal?

YES <all of the measurement results are within the normal value> : Go to Step 19.

NO <The resistance between terminal Nos.4 and 15 is less than 120 ± 20 Ω> : Go to Step 5.

NO <The resistance between terminal Nos.5 and 16 is less than 1 kΩ> : Go to Step 8.

NO <The resistance between terminal Nos.7 and 18 is less than 1 kΩ> : Go to Step 11.

NO <The resistance between terminal Nos.9 and 20 is less than 1 kΩ> : Go to Step 14.

NO <The resistance between terminal Nos.10 and 21 is less than 1 kΩ> : Go to Step 17.

STEP 5. Connector check: B-19 combination meter connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

STEP 6. Resistance measurement at B-03 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 the combination meter connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.4 and 15
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 7.

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the combination meter connector.

STEP 7. Resistance measurement at B-19 combination meter connector.
caution A digital multimeter should be used. For details refer to .


(1)Remove the combination meter, and measure at the equipment side.

(2)Resistance between B-19 combination meter connector terminal Nos.15 and 16
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Not within 120 ± 20 Ω> Replace the combination meter. Then perform the variant coding (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).

STEP 8. Connector check: B-233 ETACS-ECU connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

STEP 9. Resistance measurement at B-03 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 the ETACS-ECU connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.5 and 16
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 10.

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the ETACS-ECU connector.

STEP 10. Resistance measurement at B-233 ETACS-ECU connector.
caution A digital multimeter should be used. For details refer to .


(1)Remove the ETACS-ECU, and measure at the equipment side.

(2)Resistance between B-233 ETACS-ECU connector terminal Nos.56 and 65
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the ETACS-ECU. Then perform the variant coding (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).

STEP 11. Connector check: B-109 SRS-ECU connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 12.

Repair the defective connector.

STEP 12. Resistance measurement at B-03 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 the SRS-ECU connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.7 and 18
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 13.

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the SRS-ECU connector.

STEP 13. Resistance measurement at B-109 SRS-ECU connector.
caution A digital multimeter should be used. For details refer to .


(1)Remove the SRS-ECU, and measure at the equipment side.

(2)Resistance between B-109 SRS-ECU connector terminal Nos.26 and 1
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the SRS-ECU.

STEP 14. Connector check: B-241 steering wheel sensor connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 15.

Repair the defective connector.

STEP 15. Resistance measurement at B-03 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 the steering wheel sensor connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.9 and 20
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 16.

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the steering wheel sensor connector.

STEP 16. Resistance measurement at B-241 steering wheel sensor connector.
caution A digital multimeter should be used. For details refer to .


(1)Remove the steering wheel sensor, and measure at the equipment side.

(2)Resistance between B-241 steering wheel sensor connector terminal Nos.3 and 4
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the steering wheel sensor.

STEP 17. Connector check: B-16 diagnosis connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 18.

Repair the defective connector.

STEP 18. Resistance measurement at B-03 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 the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.10 and 21
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the diagnosis connector.

STEP 19. Resistance measurement at B-03 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 the intermediate connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-03 joint connector (CAN1) terminal Nos.11 and 22
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<2 Ω or less> Repair the wiring harness between joint connector (CAN1) and the intermediate connector.

STEP 20. Connector check: B-107 joint connector (CAN2)


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side is not damaged.

Q. Is the check result normal?

Go to Step 21.

Repair a defective connector or replace the joint connector (front wiring harness assembly).

STEP 21. Resistance measurement at the B-107 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 the connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between B-107 joint connector (CAN2) terminal Nos.7 and 18
OK: 120 ± 20 Ω

(5)Resistance between B-107 joint connector (CAN2) terminal Nos.11 and 22
OK: 1 kΩ or more

(6)Resistance between B-107 joint connector (CAN2) terminal Nos.10 and 21
OK: 1 kΩ or more

(7)Resistance between B-107 joint connector (CAN2) terminal Nos.8 and 19
OK: 1 kΩ or more

Q. Are the check results normal?

YES <all of the measurement results are within the normal value> : Go to Step 34.

NO <The resistance between terminal Nos.7 and 18 is less than 120 ± 20 Ω> : Go to Step 22.

NO <The resistance between terminal Nos.11 and 22 is less than 1 kΩ> : Go to Step 25.

NO <The resistance between terminal Nos.10 and 21 is less than 1 kΩ> : Go to Step 28.

NO <The resistance between terminal Nos.8 and 19 is less than 1 kΩ> : Go to Step 31.

STEP 22. Connector check: A-09 engine-ECU <M/T (except 1500-T/C)> or engine-A-M/T-ECU <Automated manual transmission> or A-35 engine-ECU <M/T (1500-T/C) > connector

caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 23.

Repair the defective connector.

STEP 23. Resistance measurement at the B-107 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 the joint connector (CAN2) and the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-107 joint connector (CAN2) terminal Nos.7 and 18
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 24.

<2 Ω or less> Repair the wiring harness between joint connector (CAN2) and the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector.

STEP 24. Resistance measurement at A-09 engine-ECU <M/T (except 1500-T/C)> or engine-A-M/T-ECU <Automated manual transmission> or A-35 engine-ECU <M/T (1500-T/C) > connector.
caution A digital multimeter should be used. For details refer to .

(1)Remove the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission>, and measure at the equipment side.

(2)Resistance at A-09 engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> connector terminal Nos.105 and 106 <except 1500-T/C>
OK: 120 ± 20 Ω

(3)A-35 engine-ECU <M/T> connector terminal Nos.105 and 106 <1500-T/C>
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Not within 120 ± 20 Ω> Replace the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission>. Then perform the variant coding (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).

STEP 25. Connector check: A-06 TCL/ASC-ECU connector

caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 26.

Repair the defective connector.

STEP 26. Resistance measurement at the B-107 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 the joint connector (CAN2) and the TCL/ASC-ECU connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-107 joint connector (CAN2) terminal Nos.11 and 22
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 27.

<2 Ω or less> Repair the wiring harness between joint connector (CAN2) and the TCL/ASC-ECU connector.

STEP 27. Resistance measurement at A-06 TCL/ASC-ECU connector.
caution A digital multimeter should be used. For details refer to .

(1)Connect special tool MB991984 to the TCL/ASC-ECU connector, and measure by using the check connector (connect the ECU side only).

(2)Resistance between special tool MB991984 check connector terminal Nos.38 and 39.
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the TCL/ASC-ECU. Then perform the variant coding (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).

STEP 28. Connector check: B-106 electric power steering-ECU connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 29.

Repair the defective connector.

STEP 29. Resistance measurement at the B-107 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 the joint connector (CAN2) and the electric power steering-ECU connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-107 joint connector (CAN2) terminal Nos.10 and 21
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 30.

<2 Ω or less> Repair the wiring harness between joint connector (CAN2) and the TCL/ASC-ECU connector.

STEP 30. Resistance measurement at B-106 electric power steering-ECU connector.
caution A digital multimeter should be used. For details refer to .


(1)Remove the electric power steering-ECU, and measure at the equipment side.

(2)Resistance at B-106 electric power steering-ECU connector terminal Nos.3 and 8
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the electric power steering-ECU.

STEP 31. Connector check: C-26 G and yaw rate sensor connector

caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 32.

Repair the defective connector.

STEP 32. Resistance measurement at the B-107 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 the joint connector (CAN2) and the G and yaw rate sensor connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Continuity between B-107 joint connector (CAN2) terminal Nos.8 and 19
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> Go to Step 33.

<2 Ω or less> Repair the wiring harness between joint connector (CAN2) and the TCL/ASC-ECU connector.

STEP 33. Resistance measurement at C-26 G and yaw rate sensor connector.
caution A digital multimeter should be used. For details refer to .

(1)Remove the G and yaw rate sensor, and measure at the equipment side.

(2)Resistance at C-26 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> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<Less than 1 kΩ> Replace the electric power steering-ECU.

STEP 34. Resistance measurement at the B-107 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 the joint connector (CAN2) and the intermediate connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Measure the continuity between B-107 joint connector (CAN2) terminal Nos.9 and 20.
OK: More than 2 Ω
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<More than 2 Ω> It is determined that there is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

<2 Ω or less> Repair the wiring harness between joint connector (CAN2) and the intermediate connector.