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

Either condition is met:


  • "Power Management2" is not displayed on "Bus Check".

  • "Engine Stop and Start ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside engine stop and start ECU

  • Engine stop and start ECU branch wire or connector

  • ECM main wire or connector*

  • Engine stop and start ECU

* : for 1NR-FE

WIRING DIAGRAM

A005HQ3E02
A005K7OE02

CAUTION / NOTICE / HINT

Note


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

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

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

  • After the ignition switch is turned off, check that the key 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 connectors, open the doors and leave them open.

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 may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (ENGINE STOP AND START ECU MAIN WIRE AND BRANCH WIRE)


    1. A005KV0E02
      A005JIZE01

      Disconnect the A53*1 and F75*1 or F90*2 engine stop and start ECU connectors.

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

      Standard Resistance
      for V1 Bus
      Tester Connector Switch Condition Specified Condition

      F75-2 (CA1H) - F75-1 (CA1L)*1

      F90-15 (CANH) - F90-16 (CANL)*2

      		 Ignition switch off 54 to 69 Ω
      Standard Resistance
      for Local Bus*1
      Tester Connector Switch Condition Specified Condition
      A53-2 (CA3P) - A53-1 (CA3N) Ignition switch off 108 to 132 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)*1
      *b

      Front view of wire harness connector

      (to Engine Stop and Start ECU)*2

      *1 : for 1NR-FE

      *2 : for 1NZ-FE


    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR BRANCH WIRE OR CONNECTOR (ENGINE STOP AND START ECU MAIN WIRE OR BRANCH WIRE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A005GXSE01

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition

      A53-13 (AM21) - Body ground*1

      A72-7 (BIN) - Body ground*2

      		 Always 11 to 14 V

      A53-11 (+B) - Body ground*1

      A72-5 (+B) - Body ground*2

      		 Always 11 to 14 V

      F75-4 (IG2) - Body ground*1

      F90-17 (IG1) - Body ground*2

      F90-20 (IG2) - Body ground*2

      		 Ignition switch ON 11 to 14 V
    2. A005LRXE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)*1
      *b

      Front view of wire harness connector

      (to Engine Stop and Start ECU)*2

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F75-6 (GND) - Body ground*1

      A72-8 (GND) - Body ground*2

      		 Always Below 1 Ω

      F75-5 (GND2) - Body ground*1

      A73-17 (VB-) - Body ground*2

      		 Always Below 1 Ω
      Result
      Result Proceed to
      OK (for 1NR-FE) A
      OK (for 1NZ-FE) B
      NG C

      *1 : for 1NR-FE

      *2 : for 1NZ-FE


    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    REPLACE ENGINE STOP AND START ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)