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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 78 (Can Communication System (HV) - Circuit Tests (5 Of 6)) >> CAN COMMUNICATION SYSTEM (for HV Model) >> Check Bus 4 Lines for Short Circuit [08/2020 - 12/2021] >> Procedure

Check Bus 4 Lines for Short Circuit [08/2020 - 12/2021]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the No. 1 CAN junction connector.
      GTY913845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to No. 4 CAN Junction Connector
      *c to No. 6 CAN Junction Connector *d to Steering Sensor
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G96-9 (CANH) - G96-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 4 CAN junction connector
      G96-10 (CANH) - G96-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 6 CAN junction connector
      G96-11 (CANH) - G96-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Steering sensor

      Result

      Result Proceed to
      OK A
      NG (No. 6 CAN junction connector CAN main wire) B
      NG (No. 4 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  6

    Result: 

    B 

    See step  2

  2. CHECK FOR SHORT IN CAN BUS WIRES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G96 No. 1 CAN junction connector.
    2. Disconnect the No. 6 CAN junction connector.
      GTY850985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)      		 *b to Tire Pressure Warning ECU and Receiver (w/ Tire Pressure System [Tire Inflation Pressure Display Function])
      *c to Occupant Detection ECU *d to Central Gateway ECU (Network Gateway ECU)
      *e to No. 1 CAN Junction Connector *f to Parking Brake ECU Assembly
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      M31-1 (CANH) - M31-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Tire pressure warning ECU and receiver*
      M31-2 (CANH) - M31-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Occupant detection ECU
      M31-3 (CANH) - M31-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      M31-4 (CANH) - M31-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      M31-5 (CANH) - M31-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Parking brake ECU assembly

      *: w/ Tire Pressure System (Tire Inflation Pressure Display Function)

      Result

      Result Proceed to
      OK A
      NG (Central gateway ECU [network gateway ECU] CAN main wire) B
      NG (No. 1 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 6 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  6

  3. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G96 No. 1 CAN junction connector.
    2. Disconnect the No. 4 CAN junction connector.
      GTY850971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 4 CAN Junction Connector)      		 *b to Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to Airbag ECU Assembly *d to Hybrid Vehicle Control ECU Assembly
      *e to No. 1 CAN Junction Connector *f to Rack and Pinion Power Steering Gear Assembly
      *g to ECM - -
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G104-1 (CANH) - G104-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (skid control ECU)
      G104-2 (CANH) - G104-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Airbag ECU assembly
      G104-3 (CANH) - G104-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU assembly
      G104-4 (CANH) - G104-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      G104-5 (CANH) - G104-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Rack and pinion power steering gear assembly
      G104-6 (CANH) - G104-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher ECM

      Result

      Result Proceed to
      OK A
      NG (Airbag ECU assembly CAN main wire) B
      NG (No. 1 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 4 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    See step  5

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  6

  4. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the M31 No. 6 CAN junction connector.
    2. Disconnect the central gateway ECU (network gateway ECU) connector.
      GTY900940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU [Network Gateway ECU])
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G72-22 (CA2H) - G72-7 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [08/2020 - 12/2021]

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR) 

  5. CHECK FOR SHORT IN CAN BUS WIRES (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR) 
    1. Reconnect the G104 No. 4 CAN junction connector.
    2. Disconnect the airbag ECU assembly connector.
      GTY898905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)

      Refer to PRECAUTION [08/2020 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G70-26 (CANH) - G70-27 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG ECU ASSEMBLY 

    Refer to REMOVAL [08/2020 - 12/2021]

    Result: 

    NG 

    REPLACE CAN MAIN WIRE AND CONNECTOR (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR) 

  6. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR) 
    1. Reconnect all wire harness connectors.
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

      Refer to TERMINALS OF ECU [08/2020 - 12/2021]

    3. Measure the resistance according to the value(s) in the table below.
      GTY905515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU [Network Gateway ECU])

      Standard Resistance

      Tester Connection Condition Specified Condition
      G72-22 (CA2H) - G72-7 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      HINT: 

      • If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short in the wire harness and repair or replace the wire harness or connector if necessary.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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