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Home >> Toyota >> 2021 >> Camry LE, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Circuit Tests (1 Of 4) & Diagnostic Codes (Except Hybrid) >> Can Communication System >> Check Bus 1 Lines for Short Circuit [08/2018 - 10/2020] >> Procedure

Check Bus 1 Lines for Short Circuit [08/2018 - 10/2020]: Procedure

  1. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/ Parking Assist Monitor System or Panoramic View Monitor System A
      w/ Rear View Monitor System B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A66 No. 1 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY747358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Millimeter Wave Radar Sensor Assembly
      (w/ Toyota Safety Sense P)
      *c to Forward Recognition Camera
      (w/ Toyota Safety Sense P)      		 *d to Central Gateway ECU (Network Gateway ECU)
      *e to No. 5 CAN Junction Connector - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A66-1 (CANH) - A66-7 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Millimeter wave radar sensor assembly*
      A66-2 (CANH) - A66-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Forward recognition camera*
      A66-3 (CANH) - A66-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      A66-5 (CANH) - A66-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      1. *: w/ Toyota Safety Sense P

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 5 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  8

    Result: 

    B 

    See step  3

  3. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 
    1. Disconnect the K76 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY747356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A66-3 (CANH) - A66-9 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  4. CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A66 No. 1 CAN junction connector.
    2. Disconnect the R98 No. 5 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY742429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 5 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to Clearance Warning ECU Assembly
      (w/ Intelligent Clearance Sonar System)      		 *d to Blind Spot Monitor Sensor RH
      (w/ Blind Spot Monitor System)
      *e to Rear Television Camera Assembly *f to No. 1 CAN Junction Connector
      *g to Television Camera Controller
      (w/ Panoramic View Monitor System)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      R98-1 (CANH) - R98-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      R98-2 (CANH) - R98-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Clearance warning ECU assembly*1
      R98-3 (CANH) - R98-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Blind spot monitor sensor RH*2
      R98-4 (CANH) - R98-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rear television camera assembly
      R98-5 (CANH) - R98-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      R98-8 (CANH) - R98-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Television camera controller*3
      • *1: w/ Intelligent Clearance Sonar System
      • *2: w/ Blind Spot Monitor System
      • *3: w/ Panoramic View Monitor System

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 1 CAN junction connector) C
      NG (Line to ECU or sensor) D

    Result: 

    A 

    REPLACE NO. 5 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  8

    Result: 

    B 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 
    1. Disconnect the K76 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY742423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 5 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      R98-1 (CANH) - R98-11 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  6. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A66 No. 1 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY875938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Millimeter Wave Radar Sensor Assembly
      (w/ Toyota Safety Sense P)
      *c to Forward Recognition Camera
      (w/ Toyota Safety Sense P)      		 *d to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A66-1 (CANH) - A66-7 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Millimeter wave radar sensor assembly*
      A66-2 (CANH) - A66-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Forward recognition camera*
      A66-3 (CANH) - A66-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      A66-5 (CANH) - A66-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      1. *: w/ Toyota Safety Sense P

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to ECU or sensor) C

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  8

    Result: 

    B 

    See step  7

  7. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 
    1. Disconnect the K76 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY934479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A66-3 (CANH) - A66-9 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      A66-5 (CANH) - A66-11 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  8. CHECK FOR SHORT IN CAN BUS LINES (ECU OR 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 [08/2018 - 09/2019] , or refer to TERMINALS OF ECU [09/2019 - 03/2020] , or refer to TERMINALS OF ECU [03/2020 - 10/2020]

    3. Measure the resistance according to the value(s) in the table below.
      GTY741721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU (Network Gateway ECU))

      Standard Resistance

      Tester Connection Condition Specified Condition
      K76-23 (CA1H) - K76-8 (CA1L) Cable disconnected from negative (-) 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

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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