CAN COMMUNICATION SYSTEM Popup Hood ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Popup Hood ECU Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Pedestrian Protection" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication stop history for "Pedestrian Protection" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Pedestrian Protection" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Popup Hood ECU Communication Stop Mode" in "DTC Combination Table" are output.

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  • Pedestrian detection ECU assembly branch wire or connector

  • Power source circuit of pedestrian detection ECU assembly

  • Pedestrian detection ECU assembly ground circuit

  • Pedestrian detection ECU assembly

WIRING DIAGRAM

B000YE3E04
*a No. 2 CAN Junction Connector
*b A/BAG
*c from IG2 P Relay
*d Pedestrian Detection ECU Assembly

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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

  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (PEDESTRIAN DETECTION ECU ASSEMBLY BRANCH WIRE)


    1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    2. B000VFZC03
      *a

      Front view of wire harness connector

      (to Pedestrian Detection ECU Assembly)

      Disconnect the pedestrian detection ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P40-13 (CANH) - P40-22 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPLACE CAN BRANCH WIRE AND CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B000VFZC04
      *a

      Front view of wire harness connector

      (to Pedestrian Detection ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P40-25 (E1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      P40-26 (E2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

    2. Reconnect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P40-21 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Result
      Result
      OK
      NG

    OK

    REPLACE PEDESTRIAN DETECTION ECU ASSEMBLY Click here

    NG

    REPLACE HARNESS AND CONNECTOR