Can Communication System (For Lhd) Short To Gnd In Can Bus Line

Communication System. Camry. Acv40 Gsv40
Can Communication. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)

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

CHECK FOR SHORT TO GND IN CAN BUS WIRE

RECONNECT CONNECTOR

CHECK FOR SHORT TO GND IN CAN BUS WIRE

CHECK FOR SHORT TO GND IN CAN BUS WIRE

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

RECONNECT CONNECTOR

CHECK FOR SHORT TO GND IN CAN BUS WIRE (A/C AMPLIFIER)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM MAIN BUS WIRE)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU)

CAN COMMUNICATION SYSTEM (for LHD) - Short to GND in CAN Bus Line


DESCRIPTION

A short to GND is suspected in the CAN bus wire when the resistance between terminals 4 (CG) and 6 (CANH), or terminals 4 (CG) and 14 (CANL) of the DLC3 is below 200 Ω.

Symptoms
Trouble Area
The resistance between terminals 6 (CANH) and 4 (CG), or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω.
  1. Short to GND in CAN bus wire
  2. ECM
  3. Skid control ECU
  4. Steering angle sensor
  5. Yaw rate sensor
  6. Main body ECU
  7. A/C amplifier
  8. Center airbag sensor assembly
  9. Combination meter
  10. No. 1 CAN J/C

WIRING DIAGRAM


Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line


Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance of the CAN main wire and CAN branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and lighting system are not operating.
  3. 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 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 any triggers related ECU and sensor communication on the CAN, which would cause resistance reading variations.
1.CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Turn the ignition switch off.

  1. Disconnect the DLC3 branch wire connector (E62) from the No. 1 CAN J/C B side (without earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E10-6 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E10-14 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher

  1. Reconnect the DLC3 branch wire connector (E62) to the No. 1 CAN J/C B side (without earth terminal).



NG
REPAIR OR REPLACE DLC3 BRANCH WIRE OR CONNECTOR
OK


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


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the CAN main bus wire connector (E42) from the No. 1 CAN J/C A side (with earth terminal).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Using an ohmmeter, measure the resistance between terminals 6 (CANH) and 4 (CG), and between terminals 14 (CANL) and 4 (CG) of the DLC3 each time a connector is disconnected.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E10-6 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E10-14 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


OK
Go to step 6
NG


3.CHECK FOR SHORT TO GND IN CAN BUS WIRE


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect connectors from the No. 1 CAN J/C one at a time.

    HINT:
    Disconnect the ECU and sensor connectors other than the DLC3 branch wires and CAN main bus wires between the No. 1 CAN J/C.


  1. Using an ohmmeter, measure the resistance between terminals 6 (CANH) and 4 (CG), and between terminals 14 (CANL) and 4 (CG) of the DLC3 each time a connector is disconnected.


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line


    No. 1 CAN J/C connectors ("A" side, with earth terminal)
    		Connector Color
    		Wire Color (CAN-H)
    		Wire Color (CAN-L)
    Airbag Sensor Assembly Center (E45)
    		Black
    		B
    		W

    No. 1 CAN J/C connectors ("A" side, with earth terminal)
    		Connector Color
    		Wire Color (CAN-H)
    		Wire Color (CAN-L)
    Yaw Rate Sensor (E46)*
    		Blue
    		B
    		W
    Steering Angle Sensor (E63)*
    		Brown
    		B
    		W
    Combination Meter (E43)
    		White
    		B
    		W
    Main Body ECU (E44)
    		Black
    		B
    		W
    *: with VSC
    NOTICE:
    Do not reconnect the disconnected connectors until this inspection is complete because there may be a short to GND in 2 or more CAN bus wires.

    Result:

    Symptom
    		Proceed to
    The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) is still below 200 Ω when all the specified connectors are disconnected from the No. 1 CAN J/C. (There is a short to GND in the CAN main bus wires between the No. 1 CAN J/C and No. 2 CAN J/C.)
    		A
    The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) becomes normal (200 Ω or more) when a connector is disconnected from the CAN J/C. (There is a short to GND in one of the areas that relate to the disconnected bus wires.)
    		B

  1. When there is a short to GND in one or more of the bus wires that connect to an ECU (or sensor):

    1. Reconnect all of the connectors to the No. 1 CAN J/C, except for the one that was disconnected last (the bus wire that is shorted to GND). Check that the resistance shown on the tester is normal (200 Ω or more) to confirm that there is a short to GND in one branch wire only.

      HINT:
      1. The connectors connected to the No. 1 CAN J/C can be distinguished according to the color of the communication bus wires and the shape of the connectors.
      2. Reconnecting the connectors to non-specified positions on the No. 1 CAN J/C does not affect system operation. However, it is preferred to reconnect the connectors to their specified positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


A
REPLACE NO. 1 CAN J/C
B


4.RECONNECT CONNECTOR

  1. Reconnect the connector of the bus wire that is shorted to GND to the No. 1 CAN J/C (the connector that caused the bus wire resistance to change to 200 Ω or more when it was disconnected).


NEXT


5.CHECK FOR SHORT TO GND IN CAN BUS WIRE


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the connector that includes terminals CANH and CANL from the ECU (or sensor) to which the bus wire shorted to GND is connected (CAMRY_ACV40 RM000000WI803WX.html).

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E10-6 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E10-14 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    HINT:
    If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU (or sensor), there may be a short in the ECU (or sensor).


NG
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINE OR CONNECTOR
OK

REPLACE CORRESPONDING ECU OR SENSOR

6.CHECK FOR SHORT TO GND IN CAN BUS WIRE


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Reconnect the CAN main bus wire connector (E42) to the No. 1 CAN J/C A side (with earth terminal).

  1. Disconnect the No. 2 CAN J/C connector (A40).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E10-6 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E10-14 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


OK
Go to step 10
NG


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


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the No. 2 CAN J/C connector (E41).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E41-4 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E41-10 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


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


8.RECONNECT CONNECTOR

  1. Reconnect the No. 2 CAN J/C connector (A40).


NEXT


9.CHECK FOR SHORT TO GND IN CAN BUS WIRE (A/C AMPLIFIER)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the A/C amplifier connector (E38).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E41-1 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E41-7 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


NG
REPAIR OR REPLACE A/C AMPLIFIER BRANCH LINE OR CONNECTOR
OK

REPLACE A/C AMPLIFIER

10.CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM MAIN BUS WIRE)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the No. 2 CAN J/C connector (A40).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    A40-1 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    A40-7 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


OK
Go to step 12
NG


11.CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the ECM connector (A24 or A55).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    A40-1 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    A40-7 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


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

REPLACE ECM

12.CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

  1. Disconnect the skid control ECU connector (A25 or A26).



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd).Can Communication System (For Lhd) Short To Gnd In Can Bus Line

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    A40-2 (CANH) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    A40-8 (CANL) - E10-4 (CG)
    		Ignition switch off
    		200 Ω or higher


OK
REPLACE BRAKE ACTUATOR ASSEMBLY
NG

REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR