CAN COMMUNICATION SYSTEM Certification ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Certification ECU Communication Stop Mode

  • "Entry & Start" not displayed on "Communication Bus Check" screen of intelligent tester

  • Applies to "Certification ECU Communication Stop Mode" in "DTC combination table"

  • Power source circuit of certification ECU

  • Certification ECU branch wire or connector

  • Certification ECU

Tech Tips

For vehicle with entry and start system only.

WIRING DIAGRAM

A0117D8E02

INSPECTION PROCEDURE

Note


  • Inspect the fuses for circuit related to this system before performing the following inspection procedure.

  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • 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.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU BRANCH WIRE)


    1. A0119BFE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)

      Turn the ignition switch off.

    2. Disconnect the D34 certification ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D34-9 (CANH) - D34-10 (CANL) Ignition switch off 54 to 69 Ω

    4. Reconnect the certification ECU connector.


    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)


    1. A0119BFE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)

      Disconnect the D34 certification ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D34-15 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D34-16 (IG) - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the certification ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU