Toyota Venza manuals

Toyota Venza: Check CAN Bus Line for Short to GND

Toyota Venza Service Manual / Networking / Can Communication System / Check CAN Bus Line for Short to GND

DESCRIPTION

There may be a short circuit between the CAN bus main wire and GND when there is no resistance between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of the DLC3.

Symptom

Trouble Area

No resistance exists between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of DLC3.

  • Short to GND in CAN bus main wire
  • Short to GND in CAN bus branch wire
  • Combination meter
  • ECM
  • Power steering ECU
  • Center airbag sensor assembly
  • Air conditioning amplifier*3
  • Skid control ECU (Brake actuator)
  • Steering angle sensor
  • Yaw rate sensor
  • Main body ECU (Driver side junction block)
  • 4WD control ECU*1
  • Certification ECU*2
  • Power management control ECU*2
  • Navigation receiver assembly*4
  • Radio and display receiver assembly*5
  • CAN No. 1 junction connector
  • CAN No. 2 junction connector

*1: for AWD

*2: w/ Smart key system

*3: w/o Smart key system

*4: for Navigation system

*5: for Audio and visual system

WIRING DIAGRAM



CAUTION / NOTICE / HINT

NOTICE:

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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 GND IN CAN BUS WIRE (CAN NO. 1 J/C)

(a) Turn the ignition switch off.

(b) Disconnect the CAN No. 1 junction connector (D56).

Text in Illustration

*1

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*2

to CAN No. 2 Junction Connector


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D1-6 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D1-14 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*3

DLC3



NG

GO TO STEP 4


OK

2.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C)

(a) Disconnect the CAN No. 1 junction connector (A44) .


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A44-1 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Skid control ECU

A44-12 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

A44-4 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

ECM

A44-15 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*1

Front view of wire harness connector (to CAN No. 1 Junction Connector)

*2

DLC3

*3

to Skid Control ECU

*4

to ECM

Result

Proceed to

OK

A

NG (Skid control ECU branch wire)

B

NG (ECM main wire)

C


B

GO TO STEP 8


C

GO TO STEP 9


A

3.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C)

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


Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

D56-8 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Air conditioning amplifier*1

D56-19 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D56-10 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Power management control ECU*2

D56-21 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D56-11 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

4WD control ECU*3

D56-22 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

  • *1: w/o Smart key system
  • *2: w/ Smart key system
  • *3: for AWD
Text in Illustration

*1

Front view of wire harness connector (to CAN No. 1 Junction Connector)

*2

DLC3

*3

to Air Conditioning Amplifier

*4

to Power Management Control ECU

*5

to 4WD Control ECU

Result

Proceed to

OK

A

NG (Air conditioning amplifier branch wire)

B

NG (Power management control ECU branch wire)

C

NG (4WD control ECU branch wire)

D


A

REPLACE CAN NO. 1 J/C


B

GO TO STEP 10


C

GO TO STEP 11


D

GO TO STEP 12

4.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)

(a) Disconnect the CAN No. 2 junction connector.

Text in Illustration

*1

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*2

DLC3

*3

to CAN No. 1 Junction Connector


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-9 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-20 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher


NG

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 1 J/C)


OK

5.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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


Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

D68-2 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Center airbag sensor assembly

D68-13 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-3 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Yaw rate sensor

D68-14 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-4 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Main body ECU

D68-15 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-5 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Steering angle sensor

D68-16 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*1

Front view of wire harness connector (to CAN No. 2 Junction Connector)

*2

DLC3

*3

to Center Airbag Sensor Assembly

*4

to Yaw Rate Sensor

*5

to Main Body ECU

*6

to Steering Angle Sensor

Result

Proceed to

OK

A

NG (Center airbag sensor assembly branch wire)

B

NG (Yaw rate sensor branch wire)

C

NG (Main body ECU branch wire)

D

NG (Steering angle sensor branch wire)

E


B

GO TO STEP 13


C

GO TO STEP 14


D

GO TO STEP 15


E

GO TO STEP 16


A

6.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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


Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

D68-6 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

DLC3

D68-17 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-7 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Power steering ECU

D68-18 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-8 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Combination meter

D68-19 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-10 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Certification ECU*1

D68-21 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

  • *1: w/ Smart key system
Text in Illustration

*1

Front view of wire harness connector (to CAN No. 2 Junction Connector)

*2

DLC3

*3

to DLC3

*4

to Power Steering ECU

*5

to Combination Meter

*6

to Certification ECU

Result

Proceed to

OK

A

NG (DLC3 branch wire)

B

NG (Power steering ECU branch wire)

C

NG (Combination meter main wire)

D

NG (Certification ECU branch wire)

E


B

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3


C

GO TO STEP 17


D

GO TO STEP 18


E

GO TO STEP 19


A

7.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

D68-11 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

  • Navigation receiver assembly (for Navigation system)
  • Radio and display receiver assembly (for Audio and visual system)

D68-22 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*1

Front view of wire harness connector (to CAN No. 2 Junction Connector)

*2

DLC3

*3

  • to Navigation Receiver Assembly
  • to Radio and Display Receiver Assembly

Result:

Result

Proceed to

OK

A

NG (Navigation receiver assembly branch wire)

B

NG (Radio and display receiver assembly branch wire)

C



A

REPLACE CAN NO. 2 J/C


B

GO TO STEP 20


C

GO TO STEP 21

8.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector.

Text in Illustration

*1

Front view of wire harness connector:

(to Skid Control ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A44-1 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

A44-12 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*3

DLC3

*4

to Skid Control ECU



OK

REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - SKID CONTROL ECU)

9.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - ECM)

(a) Disconnect the ECM connector.

Text in Illustration

*1

Front view of wire harness connector

(to ECM)

*2

for 1AR-FE

*3

for 2GR-FE


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A44-4 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

A44-15 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*4

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*5

DLC3

*6

to ECM


Result

Proceed to

OK (for 1AR-FE)

A

OK (for 2GR-FE)

B

NG

C


A

REPLACE ECM


B

REPLACE ECM


C

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - ECM)

10.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the air conditioning amplifier connector.

Text in Illustration

*1

Front view of wire harness connector

(to Air Conditioning Amplifier)


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


Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-8 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D56-19 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*3

DLC3

*4

to Air Conditioning Amplifier


OK

REPLACE AIR CONDITIONING AMPLIFIER


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

11.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

Text in Illustration

*1

Rear view of wire harness connector

(to Power Management Control ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-10 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D56-21 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*3

DLC3

*4

to Power Management Control ECU



OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

12.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - 4WD CONTROL ECU)

(a) Disconnect the 4WD control ECU connector.

Text in Illustration

*1

Front view of wire harness connector

(to 4WD Control ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-11 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D56-22 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

*3

DLC3

*4

to 4WD Control ECU



OK

REPLACE 4WD CONTROL ECU


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - 4WD CONTROL ECU)

13.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

(a) Disconnect the center airbag sensor assembly connector.

Text in Illustration

*1

Front view of wire harness connector

(to Center Airbag Sensor Assembly)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-2 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-13 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Center Airbag Sensor Assembly



OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

14.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - YAW RATE SENSOR)

(a) Disconnect the yaw rate sensor connector.

Text in Illustration

*1

Front view of wire harness connector

(to Yaw Rate Sensor)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-3 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-14 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Yaw Rate Sensor



OK

REPLACE YAW RATE SENSOR


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - YAW RATE SENSOR)

15.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - MAIN BODY ECU)

(a) Disconnect the main body ECU connector.

Text in Illustration

*1

Front view of wire harness connector

(to Main Body ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-4 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-15 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Main Body ECU



OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - MAIN BODY ECU)

16.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - STEERING ANGLE SENSOR)

(a) Disconnect the steering angle sensor connector.

Text in Illustration

*1

Front view of wire harness connector

(to Steering Angle Sensor)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-5 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-16 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Steering Angle Sensor



OK

REPLACE STEERING ANGLE SENSOR


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - STEERING ANGLE SENSOR)

17.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - POWER STEERING ECU)

(a) Disconnect the power steering ECU connector.

Text in Illustration

*1

Front view of wire harness connector

(to Power Steering ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-7 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-18 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Power Steering ECU



OK

REPLACE POWER STEERING ECU


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - POWER STEERING ECU)

18.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - COMBINATION METER)

(a) Disconnect the combination meter connector.

Text in Illustration

*1

Front view of wire harness connector

(to Combination Meter)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-8 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-19 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Combination Meter



OK

REPLACE COMBINATION METER


NG

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - COMBINATION METER)

19.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CERTIFICATION ECU)

(a) Disconnect the certification ECU connector.

Text in Illustration

*1

Front view of wire harness connector

(to Certification ECU)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-10 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-21 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Certification ECU



OK

REPLACE SMART KEY ECU ASSEMBLY (CERTIFICATION ECU)


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CERTIFICATION ECU)

20.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the navigation receiver assembly connector.

Text in Illustration

*1

Front view of wire harness connector

(to Navigation Receiver Assembly)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-11 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-22 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Navigation Receiver Assembly



OK

REPLACE NAVIGATION RECEIVER ASSEMBLY


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - NAVIGATION RECEIVER ASSEMBLY)

21.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the radio and display receiver assembly connector.

Text in Illustration

*1

Front view of wire harness connector

(to Radio and Display Receiver Assembly)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D68-11 (CANH) - D1-4 (CG)

Ignition switch off

200 Ω or higher

D68-22 (CANL) - D1-4 (CG)

Ignition switch off

200 Ω or higher

Text in Illustration

*2

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

*3

DLC3

*4

to Radio and Display Receiver Assembly



OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - RADIO AND DISPLAY RECEIVER ASSEMBLY)

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