NETWORKING  CAN COMMUNICATION SYSTEM  Check CAN Bus Line for Short to +B  


DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminals 6 (CANH) and 16 (BAT) or 14 (CANL) and 16 (BAT) of the DLC3.

Symptom Trouble Area
No resistance exists between terminals 6 (CANH) and 16 (BAT) or 14 (CANL) and 16 (BAT) of DLC3.
·

Short in CAN main bus line

·

Short in CAN branch line

·

Combination meter assembly

·

Power steering ECU assembly

·

Main body ECU (multiplex network body ECU)

·

Airbag ECU assembly*1

·

ECM

·

Skid control ECU (brake actuator assembly)*2

·

Air conditioning amplifier assembly

·

No. 1 CAN junction connector

·

No. 2 CAN junction connector



·

*1: w/ Airbag System

·

*2: for ABS


WIRING DIAGRAM

C354986E01
0.115,0.083 1.219,0.323 1.104,0.24 12 false V Bus: 3.365,0.26 4.135,0.458 0.771,0.198 10 false 120 Ω 4.052,0.844 4.823,1.042 0.771,0.198 10 false CANH 2.74,0.844 3.51,1.042 0.771,0.198 10 false CANL 0.333,0.615 1.104,0.813 0.771,0.198 10 false E43 0.677,0.615 2.833,0.896 2.156,0.281 10 false Combination Meter Assembly 5.813,0.104 7.156,0.365 1.344,0.26 10 false x: Suspected Area 4.042,1.094 4.813,1.292 0.771,0.198 10 false 32 2.958,1.094 3.729,1.292 0.771,0.198 10 false 31 4.104,1.302 4.875,1.5 0.771,0.198 10 false LG 2.906,1.292 3.677,1.49 0.771,0.198 10 false W 4.073,1.51 4.844,1.708 0.771,0.198 10 false 4 2.958,1.5 3.729,1.698 0.771,0.198 10 false 15 4.365,1.677 5.135,1.875 0.771,0.198 10 false E55 4.688,1.677 6.802,1.948 2.115,0.271 10 false No. 2 CAN Junction Connector 4.365,2.26 5.135,2.458 0.771,0.198 10 false 9 4.333,2.771 5.104,2.969 0.771,0.198 10 false 20 4.958,2.833 5.729,3.031 0.771,0.198 10 false W 4.927,2.198 5.698,2.396 0.771,0.198 10 false GR 5.656,2.24 6.427,2.438 0.771,0.198 10 false 7 5.656,2.771 6.427,2.969 0.771,0.198 10 false 8 5.854,2.271 6.625,2.469 0.771,0.198 10 false CANH 5.865,2.75 6.635,2.948 0.771,0.198 10 false CANL 5.49,3.031 6.26,3.229 0.771,0.198 10 false E40 5.792,3.031 7.073,3.448 1.281,0.417 10 false Power Steering ECU Assembly 4.344,3.865 5.115,4.063 0.771,0.198 10 false 11 4.344,4.354 5.115,4.552 0.771,0.198 10 false 22 4.948,4.438 5.719,4.635 0.771,0.198 10 false W 4.938,3.802 5.708,4 0.771,0.198 10 false BE 5.583,3.844 6.354,4.042 0.771,0.198 10 false 6 5.677,4.375 6.448,4.573 0.771,0.198 10 false 14 5.833,3.99 6.604,4.188 0.771,0.198 10 false CANH 5.917,4.229 6.688,4.427 0.771,0.198 10 false CANL 5.677,4.594 6.448,4.792 0.771,0.198 10 false E13 6,4.594 6.708,4.844 0.708,0.25 10 false DLC3 4.365,5.281 5.135,5.479 0.771,0.198 10 false 8 4.323,5.781 5.094,5.979 0.771,0.198 10 false 19 4.958,5.844 5.729,6.042 0.771,0.198 10 false W 4.969,5.208 5.74,5.406 0.771,0.198 10 false G 5.583,5.271 6.354,5.469 0.771,0.198 10 false 14 5.594,5.771 6.365,5.969 0.771,0.198 10 false 13 5.854,5.281 6.625,5.479 0.771,0.198 10 false CANH 5.865,5.781 6.635,5.979 0.771,0.198 10 false CANL 5.167,6.073 5.938,6.271 0.771,0.198 10 false E31 5.49,6.063 7.135,6.552 1.646,0.49 10 false Main Body ECU (Multiplex Network Body ECU) 4.052,6.208 4.823,6.406 0.771,0.198 10 false 5 2.958,6.208 3.729,6.406 0.771,0.198 10 false 16 3.979,7.948 5.844,8.188 1.865,0.24 10 false : CAN Branch Line (CANH) 4,8.323 5.969,8.625 1.969,0.302 10 false : CAN Branch Line (CANL) 0.823,7.958 2.823,8.219 2,0.26 10 false : CAN Main Bus Line (CANH) 0.854,8.344 2.917,8.594 2.063,0.25 10 false : CAN Main Bus Line (CANL) 2.719,3.052 3.49,3.25 0.771,0.198 10 false 1 2.083,3.01 2.854,3.208 0.771,0.198 10 false V 1.5,3.063 2.271,3.26 0.771,0.198 10 false 13 0.063,3.844 0.833,4.042 0.771,0.198 10 false E14 0.385,3.844 2.115,4.135 1.729,0.292 10 false Airbag ECU Assembly*1 1.49,3.563 2.26,3.76 0.771,0.198 10 false 22 2.052,3.625 2.823,3.823 0.771,0.198 10 false W 2.667,3.552 3.438,3.75 0.771,0.198 10 false 12 2.719,4.979 3.49,5.177 0.771,0.198 10 false 2 2.458,4.906 3.229,5.104 0.771,0.198 10 false Y 2.667,5.479 3.438,5.677 0.771,0.198 10 false 13 2.438,5.542 3.208,5.74 0.771,0.198 10 false W 1.479,5.344 2.25,5.542 0.771,0.198 10 false E102 1.969,5.354 2.74,5.552 0.771,0.198 10 false E7 1.958,5.094 2.729,5.292 0.771,0.198 10 false E7 1.479,5.094 2.25,5.292 0.771,0.198 10 false E102 1.49,4.885 2.26,5.083 0.771,0.198 10 false 11*2 1.958,4.885 2.729,5.083 0.771,0.198 10 false 8*3 1.49,5.552 2.26,5.75 0.771,0.198 10 false 12*2 1.958,5.552 2.729,5.75 0.771,0.198 10 false 9*3 0.271,5.781 1.865,6.271 1.594,0.49 10 false Air Conditioning Amplifier Assembly 0.969,3.073 1.74,3.271 0.771,0.198 10 false CANH 0.99,3.563 1.76,3.76 0.771,0.198 10 false CANL 0.979,4.979 1.75,5.177 0.771,0.198 10 false CANH 1,5.469 1.771,5.667 0.771,0.198 10 false CANL 0.292,6.833 1.792,7.063 1.5,0.229 10 false *1: w/ Airbag System 0.281,7.146 3.083,7.385 2.802,0.24 10 false *2: for Automatic Air Conditioning System 0.271,7.448 3.073,7.688 2.802,0.24 10 false *3: for Manual Air Conditioning System

C302662E01
0.156,0.104 1.042,0.385 0.885,0.281 12 false V Bus: 5.042,0.313 6.479,0.719 1.438,0.406 10 false x: Suspected Area 0.875,4.948 2.76,5.302 1.885,0.354 10 false : CAN Main Bus Line (CANH) 0.896,5.354 2.781,5.708 1.885,0.354 10 false : CAN Main Bus Line (CANL) 4.063,4.958 5.948,5.313 1.885,0.354 10 false : CAN Branch Line (CANH) 4.083,5.365 5.969,5.719 1.885,0.354 10 false : CAN Branch Line (CANL) 4.021,0.521 4.344,0.906 0.323,0.385 10 false L 2.927,0.521 3.25,0.906 0.323,0.385 10 false W 3.99,0.74 4.292,0.969 0.302,0.229 10 false 1 2.969,0.74 3.271,0.969 0.302,0.229 10 false 12 0.604,0.927 0.938,1.188 0.333,0.26 10 false A39 0.906,0.927 3.01,1.333 2.104,0.406 10 false No. 1 CAN Junction Connector 4.292,1.167 4.594,1.396 0.302,0.229 10 false 5 4.271,1.635 4.573,1.865 0.302,0.229 10 false 16 5.115,1.74 5.438,2.125 0.323,0.385 10 false W 5.125,1.125 5.448,1.51 0.323,0.385 10 false V 5.625,1.177 5.927,1.406 0.302,0.229 10 false 25 5.625,1.625 5.927,1.854 0.302,0.229 10 false 14 5.833,1.177 6.281,1.458 0.448,0.281 10 false CANH 5.854,1.625 6.302,1.906 0.448,0.281 10 false CANL 5.292,1.875 5.615,2.156 0.323,0.281 10 false A48 5.573,1.875 7.104,2.354 1.531,0.479 10 false Skid Control ECU (Brake Actuator Assembly)*1 2.979,2.427 3.281,2.656 0.302,0.229 10 false 17 3.979,2.417 4.281,2.646 0.302,0.229 10 false 6 2.927,2.844 3.25,3.229 0.323,0.385 10 false W 4.021,2.844 4.344,3.229 0.323,0.385 10 false B 3.052,3.417 3.365,3.656 0.313,0.24 10 false A40 3.792,3.427 4.104,3.667 0.313,0.24 10 false A40 3.042,3.615 3.354,3.854 0.313,0.24 10 false A56 3.792,3.615 4.104,3.854 0.313,0.24 10 false A56 3.052,3.802 3.365,4.042 0.313,0.24 10 false A56 3.802,3.813 4.115,4.052 0.313,0.24 10 false A56 2.667,3.427 3.042,3.688 0.375,0.26 10 false 26*2 2.74,3.615 3.115,3.875 0.375,0.26 10 false 9*3 2.667,3.813 3.042,4.073 0.375,0.26 10 false 49*4 4.146,3.427 4.521,3.688 0.375,0.26 10 false 13*2 4.167,3.615 4.542,3.875 0.375,0.26 10 false 8*3 4.167,3.802 4.542,4.063 0.375,0.26 10 false 41*4 3.979,4.031 4.427,4.313 0.448,0.281 10 false CANH 2.74,4.031 3.188,4.313 0.448,0.281 10 false CANL 3.365,4.635 3.813,4.917 0.448,0.281 10 false 120 Ω 4.563,4.302 5.01,4.583 0.448,0.281 10 false ECM 0.292,3.219 1.365,3.542 1.073,0.323 10 false *1: w/ ABS 0.292,3.552 1.365,3.875 1.073,0.323 10 false *2: for 2ZR-FE 0.313,4.219 1.385,4.542 1.073,0.323 10 false *4: for 2NZ-FE 0.292,3.896 1.365,4.219 1.073,0.323 10 false *3: for 1ZR-FE

CAUTION / NOTICE / HINT

NOTICE:
·

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

·

DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds, and then drive the vehicle at a speed of 20 km/h (12 mph) or more for 300 seconds or more.

·

After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM



HINT:
·

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

·

Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.



PROCEDURE

1.CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)
a.

Disconnect the cable from the negative (-) battery terminal.


b.

Disconnect the A39 No. 1 CAN junction connector.

C289289C41
1.927,0.333 2.323,0.625 0.396,0.292 5.333,0.479 5.729,0.771 0.396,0.292 6.406,2.833 6.302,2.833 6.302,2.833 6.135,2.167 true 1.479,2.073 1.26,1.104 1.26,1.104 1.115,1.104 true 2.01,2.073 1.646,0.885 1.646,0.885 1.531,0.885 true 1.5,2.344 1.292,2.833 1.292,2.833 1.177,2.833 true 2.01,2.323 1.802,3.042 1.802,3.042 1.677,3.042 true 2.135,2.073 2.292,0.948 2.292,0.948 2.479,0.948 true 2.146,2.323 2.396,3.042 2.396,3.042 2.5,3.042 true 0.073,0.063 0.385,0.26 0.313,0.198 10 false *a 4.042,0.052 4.354,0.25 0.313,0.198 10 false *1 2.01,0.365 2.323,0.563 0.313,0.198 10 false A39 5.417,0.521 5.729,0.719 0.313,0.198 10 false E13 6.479,2.74 6.938,2.938 0.458,0.198 10 false BAT 1.146,2.958 2.063,3.156 0.917,0.198 10 false CANL*c 0.979,0.792 1.896,0.99 0.917,0.198 10 false CANH*c 2.531,0.844 3.448,1.042 0.917,0.198 10 false CANH*d 0.542,1.01 1.458,1.208 0.917,0.198 10 false CANH*b 0.646,2.74 1.563,2.938 0.917,0.198 10 false CANL*b 2.573,2.948 3.49,3.146 0.917,0.198 10 false CANL*d
*1 DLC3 - -
*a Front view of wire harness connector
(to No. 1 CAN Junction Connector) 		*b to No. 2 CAN Junction Connector
*c to Skid Control ECU (Brake Actuator Assembly)
(w/ ABS) 		*d to ECM



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition Connected to
A39-1 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 2 CAN junction connector
A39-12 (CANL) - E13-16 (BAT)
A39-5 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Skid control ECU (brake actuator assembly)*
A39-16 (CANL) - E13-16 (BAT)
A39-6 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher ECM
A39-17 (CANL) - E13-16 (BAT)


*: w/ ABS



Result:
Result Proceed to
OK A
NG (No. 2 CAN junction connector main line) B
NG (ECU or sensor bus line) C



A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

B

2.CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR)

C

3.CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU, SENSOR)
2.CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR)
a.

Reconnect the A39 No. 1 CAN junction connector.


b.

Disconnect the E55 No. 2 CAN junction connector.

C289289C42
1.927,0.333 2.323,0.625 0.396,0.292 5.333,0.479 5.729,0.771 0.396,0.292 6.406,2.833 6.302,2.833 6.302,2.833 6.135,2.167 true 1.5,2.063 0.854,1.677 0.854,1.677 0.729,1.677 true 1.625,2.083 0.99,1.333 0.99,1.333 0.854,1.333 true 1.49,2.323 0.927,2.531 0.927,2.531 0.813,2.531 true 1.635,2.323 1.052,2.802 1.052,2.802 0.948,2.802 true 1.865,2.083 1.25,0.74 1.25,0.74 1.094,0.74 true 1.885,2.333 1.427,3.344 1.427,3.344 1.25,3.344 true 2,2.063 1.396,0.469 1.396,0.469 1.271,0.469 true 2.021,2.323 1.531,3.521 1.531,3.521 1.417,3.521 true 2.396,2.073 2.771,0.781 2.771,0.781 2.885,0.781 true 2.396,2.313 2.698,3.24 2.698,3.24 2.813,3.24 true 2.521,2.073 2.927,0.99 2.927,0.99 3.031,0.99 true 2.531,2.292 2.885,3.042 2.885,3.042 3,3.042 true 2.781,2.063 3.219,1.5 3.219,1.5 3.333,1.5 true 2.781,2.292 3.208,2.573 3.208,2.573 3.344,2.573 true 0.073,0.063 0.385,0.26 0.313,0.198 10 false *a 4.042,0.052 4.354,0.25 0.313,0.198 10 false *1 2,0.365 2.313,0.563 0.313,0.198 10 false E55 5.417,0.51 5.729,0.708 0.313,0.198 10 false E13 6.479,2.74 6.938,2.938 0.458,0.198 10 false BAT 0.385,2.698 1.302,2.896 0.917,0.198 10 false CANL*c 0.281,1.24 1.198,1.438 0.917,0.198 10 false CANH*c 0.708,0.354 1.625,0.552 0.917,0.198 10 false CANH*e 0.146,1.583 1.063,1.781 0.917,0.198 10 false CANH*b 0.26,2.438 1.177,2.635 0.917,0.198 10 false CANL*b 0.885,3.417 1.802,3.615 0.917,0.198 10 false CANL*e 0.563,0.646 1.479,0.844 0.917,0.198 10 false CANH*d 0.74,3.24 1.656,3.438 0.917,0.198 10 false CANL*d 2.948,0.688 3.865,0.885 0.917,0.198 10 false CANH*f 2.865,3.146 3.781,3.344 0.917,0.198 10 false CANL*f 3.083,0.896 4,1.156 0.917,0.26 10 false CANH*g 3.083,2.948 4,3.177 0.917,0.229 10 false CANL*g 3.396,1.406 4.313,1.667 0.917,0.26 10 false CANH*h 3.406,2.479 4.323,2.708 0.917,0.229 10 false CANL*h
*1 DLC3 - -
*a Front view of wire harness connector
(to No. 2 CAN Junction Connector) 		*b to Airbag ECU Assembly
(w/ Airbag System)
*c to Air Conditioning Amplifier Assembly *d to Combination Meter Assembly
*e to No. 1 CAN Junction Connector *f to Main Body ECU (Multiplex Network Body ECU)
*g to Power Steering ECU Assembly *h to DLC3



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition Connected to
E55-1 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Airbag ECU assembly*
E55-12 (CANL) - E13-16 (BAT)
E55-2 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Air conditioning amplifier assembly
E55-13 (CANL) - E13-16 (BAT)
E55-4 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Combination meter assembly
E55-15 (CANL) - E13-16 (BAT)
E55-5 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 1 CAN junction connector
E55-16 (CANL) - E13-16 (BAT)
E55-8 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Main body ECU (multiplex network body ECU)
E55-19 (CANL) - E13-16 (BAT)
E55-9 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Power steering ECU assembly
E55-20 (CANL) - E13-16 (BAT)
E55-11 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher DLC3
E55-22 (CANL) - E13-16 (BAT)


*: w/ Airbag System



Result:
Result Proceed to
OK A
NG (No. 1 CAN junction connector main line) B
NG (ECU or sensor bus line) C
NG (DLC3 branch line) D



A

REPLACE NO. 2 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

C

3.CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU, SENSOR)

D

REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3

3.CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU, SENSOR)
a.

Reconnect all wire harness connectors.


b.

Disconnect the ECU or sensor connected to the CAN bus line that is shorted to +B.

HINT:

If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus lines. To determine the ECU or sensor that is connected to the shorted bus line, refer to Terminals of ECU.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>TERMINALS OF ECU



c.
C151827C71
1.5,0.708 2,0.958 0.5,0.25 2.052,1.854 2.302,1.271 2.302,1.271 2.542,1.271 true 2.052,2.583 1.865,3.042 1.865,3.042 1.667,3.042 true 2.479,2.583 2.583,3.021 2.583,3.021 2.792,3.021 true 0.135,0.125 0.552,0.458 0.417,0.333 10 false *1 2.594,1.167 3.167,1.49 0.573,0.323 10 false CANH 1.26,2.938 2.031,3.302 0.771,0.365 10 false CANL 1.635,0.75 2.208,1.188 0.573,0.438 10 false E13 2.844,2.917 3.313,3.135 0.469,0.219 10 false BAT
*1 DLC3


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
E13-6 (CANH) - E13-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
E13-14 (CANL) - E13-16 (BAT)


HINT:

If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.



Result:
Result
OK
NG



OK

REPLACE CORRESPONDING ECU OR SENSOR

NG

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINE OR CONNECTOR