Can Communication System (For Sedan) Can Bus Line

Power Source Network. Yaris. Ncp93, 131
Networking. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

CHECK CAN BUS WIRE (FOR SHORT TO +B)

CHECK CAN BUS WIRE (FOR SHORT TO GND)

CAN COMMUNICATION SYSTEM (for Sedan) - CAN Bus Line


DESCRIPTION

When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to specify the trouble area, and check that there is no short in the CAN main wire, between the CAN bus lines, to +B, or to GND.

WIRING DIAGRAM


Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Sedan) Can Bus Line


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  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:
  1. Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1.CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)


    Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Sedan) Can Bus Line

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Proceed to
    D15-6 (CANH) - D15-14 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    		OK
    D15-6 (CANH) - D15-14 (CANL)
    		Ignition switch off
    		69 Ω or higher
    		NG-A
    D15-6 (CANH) - D15-14 (CANL)
    		Ignition switch off
    		54 Ω or less
    		NG-B
    Text in Illustration
    *1
    		DLC3


NG-A
CHECK CAN MAIN WIRE (FOR OPEN CIRCUIT) (YARIS_NCP93 RM000001U4B00JX.html)

NG-B
CHECK CAN BUS WIRE (FOR SHORT CIRCUIT) (YARIS_NCP93 RM000001FA902GX.html)
OK


2.CHECK CAN BUS WIRE (FOR SHORT TO +B)


    Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Sedan) Can Bus Line

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D15-6 (CANH) - D15-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    D15-14 (CANL) - D15-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *1
    		DLC3


NG
CHECK CAN BUS WIRE (FOR SHORT TO +B) (YARIS_NCP93 RM000001FAA024X.html)
OK


3.CHECK CAN BUS WIRE (FOR SHORT TO GND)


    Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Sedan) Can Bus Line

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D15-6 (CANH) - D15-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    D15-14 (CANL) - D15-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    Text in Illustration
    *1
    		DLC3


NG
CHECK CAN BUS WIRE (FOR SHORT TO GND) (YARIS_NCP93 RM000001FAB00LX.html)
OK

HOW TO PROCEED WITH TROUBLESHOOTING (YARIS_NCP93 RM000001D3500JX.html)