CAN COMMUNICATION SYSTEM Engine Stop and Start ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Engine Stop and Start ECU Communication Stop Mode

  • "Stop and Go" is not displayed on "Communication Bus Check" screen of intelligent tester

  • Applies to "Engine Stop and Start ECU Communication Stop Mode" in "DTC combination table"

  • Power source circuit engine stop and start ECU

  • Engine stop and start ECU branch wire and connector

  • Engine stop and start ECU

WIRING DIAGRAM

A011BVAE01

INSPECTION PROCEDURE

Note


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

  • 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 the connectors, open the doors and leave them open.

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

Tech Tips


  • 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 will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK CAN BUS LINE FOR DISCONNECTION (ENGINE STOP AND START ECU BRANCH WIRE)


    1. A0117SPE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the D78 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D78-16 (CANH) - D78-17 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ENGINE STOP AND START ECU (CANH, CANL)

    OK

  2. CHECK WIRE HARNESS (ENGINE STOP AND START ECU - BATTERY AND BODY GROUND)


    1. A011B4XE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the D78 and D79 engine stop and start ECU connector.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D78-1 (EC) - Body ground Always Below 1 Ω
        D78-6 (E1) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        D79-5 (BATT) - Body ground Always 11 to 14 V
        D79-6 (+B) - Body ground Ignition switch ON 11 to 14 V
        D78-19 (IGSW) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ENGINE STOP AND START ECU Click here