Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Abs And Traction Actuator (Skid Control Ecu) Communication Stop Mode

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

CAN COMMUNICATION SYSTEM (for Hatchback with Separate Type Yaw Rate Sensor) - ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode


DESCRIPTION


Detection Item
Symptom
Trouble Area
ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode
Either condition is met:
  1. "Skid Control (ABS/VSC/TRAC)" is not displayed on "Bus Check".
  2. "ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode" in "DTC Combination Table" applies.
  1. Power source or inside skid control ECU (brake actuator assembly)
  2. Skid control ECU (brake actuator assembly) branch wire or connector
  3. Skid control ECU (brake actuator assembly)

WIRING DIAGRAM


Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Abs And Traction Actuator (Skid Control Ecu) Communication Stop Mode


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  3. Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  4. After the ignition switch is turned off, check that the key reminder warning system are not operating.
  5. 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:
  1. 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.
  2. 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.
1.CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)


    Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Abs And Traction Actuator (Skid Control Ecu) Communication Stop Mode

  1. Disconnect the A70 skid control ECU (brake actuator assembly) connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A70-25 (CANH) - A70-14 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU (Brake Actuator Assembly))


NG
REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)
OK


2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) Abs And Traction Actuator (Skid Control Ecu) Communication Stop Mode

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A70-12 (+BS) - Body ground
    		Always
    		11 to 14 V
    A70-24 (BM) - Body ground
    		Always
    		11 to 14 V
    A70-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A70-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    A70-13 (GND2) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (YARIS_NCP93 RM000001BXP02KX.html)