CAN COMMUNICATION SYSTEM Shift Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Shift Control ECU Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Transmission Control" is indicated on the "Communication Bus Check" screen of the GTS.

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

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

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  • Shift control ECU branch wire or connector

  • Power source circuit of shift control ECU

  • Shift control ECU ground circuit

  • Shift control ECU

WIRING DIAGRAM

B004TLCE07

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 power 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 (SHIFT CONTROL ECU BRANCH WIRE)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      Note

      Perform shift control ECU removal and connector disconnection procedures with the power supply from the sub-battery turned off.

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    2. Disconnect the G81 shift control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G81-9 (CA1H) - G81-8 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the G82 shift control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G81-1 (E1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      G81-11 (EC) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      G82-4 (E03) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      G82-5 (E02) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      G82-6 (E01) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      G82-17 (E12) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    3. Reconnect the cable to the negative (-) auxiliary battery terminal.

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G82-1 (BATT) - Body ground Power switch off 8 to 15.4 V
      G81-10 (BUB) - Body ground 5 seconds after power switch on (IG)* 8 to 15.4 V
      G81-18 (ACC) - Body ground Power switch on (ACC) 8 to 15.4 V
      Power switch off Below 1 V
      G81-20 (IGCT) - Body ground Power switch on (IG) 8 to 15.4 V
      Power switch off Below 1 V
      G81-27 (IG2) - Body ground Power switch on (IG) 8 to 15.4 V
      Power switch off Below 1 V
      *: Power is supplied from the sub-battery assembly with control for only 5 seconds after the power switch is turned on (IG). Therefore, measure the voltage during that time.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SHIFT CONTROL ECU for 2WD: Click here
    REPLACE SHIFT CONTROL ECU for AWD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)