LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Can Communication System - Circuit Tests (1 Of 9) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HEV Model) >> Check CAN Communication Connection [11/2021 - 03/2022] >> Procedure

Check CAN Communication Connection [11/2021 - 03/2022]: Procedure

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GTS OPERATION 
    1. Connect the GTS to the DLC3 of another vehicle.
    2. Turn the ignition switch to ON.
    3. Turn the GTS on.
    4. Check that the GTS and ECUs can communicate with the ignition switch ON.

      HINT: 

      • ECUs and sensors are not displayed on the "Communication Bus Check" screen when the GTS cannot communicate with the vehicle.
      • If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.
      • If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)

      Result

      Result Proceed to
      OK (Communication between the GTS and the vehicle is not possible but communication is possible when connected to another vehicle.) A
      NG (Communication is not possible between the GTS and the vehicle, nor between the GTS and another vehicle.) B

    Result: 

    B 

    REFER TO GTS OPERATOR'S MANUAL 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (DLC3 POWER SOURCE CIRCUIT) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D66-16 (BAT) - Body ground Ignition switch off 11 to 14 V
      GTY1059956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D66-4 (CG) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK OPEN IN CAN BUS LINES 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1059956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D66-6 (CANH) - D66-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal Below 70 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. CHECK SHORT IN CAN BUS LINES 
    1. Measure the resistance according to the value(s) in the table below.
      GTY1059955Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D66-6 (CANH) - D66-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 Ω or higher
      D66-6 (CANH) - D66-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      D66-14 (CANL) - D66-4 (CG)
      D66-6 (CANH) - D66-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      D66-14 (CANL) - D66-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the D155 or D71 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D155-22 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      W/O TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D71-22 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      W/ TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D155-1 (BATT) - Body ground Ignition switch off 11 to 14 V
      D155-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      D155-19 (IGP) - Body ground Ignition switch ON 11 to 14 V
      D155-20 (IGR) - Body ground Ignition switch ON 11 to 14 V
      W/O TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D71-1 (BATT) - Body ground Ignition switch off 11 to 14 V
      D71-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      D71-19 (IGP) - Body ground Ignition switch ON 11 to 14 V
      D71-20 (IGR) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

  6. CHECK SHORT IN CAN BUS LINES 
    1. Disconnect the D155 or D71 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D155-16 (CA6H) - D155-17 (CA6L) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher
      D155-16 (CA6H) - D66-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      D155-17 (CA6L) - D66-4 (CG)
      D155-16 (CA6H) - D66-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      D155-17 (CA6L) - D66-16 (BAT)
      W/O TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D71-16 (CA6H) - D71-17 (CA6L) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher
      D71-16 (CA6H) - D66-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      D71-17 (CA6L) - D66-4 (CG)
      D71-16 (CA6H) - D66-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      D71-17 (CA6L) - D66-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  7. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3) 
    1. Disconnect the D155 or D71 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D155-16 (CA6H) - D66-6 (CANH) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      D155-17 (CA6L) - D66-14 (CANL)
      W/O TELEMATICS TRANSCEIVER

      Tester Connection Condition Specified Condition
      D71-16 (CA6H) - D66-6 (CANH) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      D71-17 (CA6L) - D66-14 (CANL)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3) 

scientia non olet · About LEMON Manuals