CAN COMMUNICATION SYSTEM Open in CAN Main Bus Line

DESCRIPTION

The CAN main bus line and DLC3 sub bus line may have a disconnection when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 Ω.

Symptom Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 Ω.

  • CAN main bus line

  • ECM

  • CAN J/C

WIRING DIAGRAM

A01BBXRE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DLC3


    1. A01BI1KE24

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

      Result
      Tester Connection Condition Specified Value Result
      H23-6 (CANH) - H23-14 (CANL) IG switch OFF 108 to 132 Ω A
      H23-6 (CANH) - H23-14 (CANL) IG switch OFF 132 Ω or higher B

      Note

      When the measured value is 132 Ω or higher and air conditioning control functions (cooling, heating, and dehumidification) do not operate normally, there may be a fault other than a disconnection in the DLC3 sub bus line. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING Click here" after repairing the trouble area.


    B

    REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

    A

  2. INSPECT CAN J/C


    1. A01BFF5E04

      Disconnect the CAN main bus line connector (H4) from the CAN J/C.

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

    2. A01BD9HE01

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

      Standard resistance
      Between the terminals where the connector (H4) was connected Condition Specified Value
      CANH - CANL IG switch OFF 108 to 132 Ω

    NG

    REPLACE CAN J/C

    OK

  3. INSPECT ECM


    1. A01BDWLE02

      Disconnect the ECM connector (B7). (for 1TR-FE, 2TR-FE, 2KD-FTV)

    2. Disconnect the ECM connector (B47). (for 1KD-FTV)

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

      Standard resistance
      for 1TR-FE, 2TR-FE
      Tester connection Condition Specified Value
      B7-33 (CANH) - B7-34 (CANL) IG switch OFF 108 to 132 Ω
      for 1KD-FTV
      Tester connection Condition Specified Value
      B47-35 (CANH) - B47-36 (CANL) IG switch OFF 108 to 132 Ω
      for 2KD-FTV
      Tester connection Condition Specified Value
      B7-24 (CANH) - B7-23 (CANL) IG switch OFF 108 to 132 Ω
      A01BFIVE04

    NG

    REPLACE ECM

    OK

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C - ECM)