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Home >> Toyota >> 2018 >> Prius C One >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Safety Sense C) - Diagnostic Codes & Symptom Tests >> CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense C) >> Open in CAN Main Bus Line [11/2015 - ] >> Procedure

Open in CAN Main Bus Line [11/2015 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY714255Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-6 (CANH) - G4-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *1 DLC3
      NOTE:

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] ).

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3 

    Result: 

    OK 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY - CAN J/C RH) 
    1. Disconnect the G1 combination meter assembly connector.
      GTY686232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-31 (CANH) -G1-32 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (ECM - CAN J/C LH) 
    1. Reconnect the G1 combination meter assembly connector.
    2. Disconnect the A40 ECM connector.
      GTY737148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A40-13 (CANH) - A40-26 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C RH) 
    1. Reconnect the A40 ECM connector.
    2. Disconnect the G72 CAN junction connector RH.
      GTY702436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G72-7 (CANH) - G72-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Combination meter assembly
      G72-10 (CANH) - G72-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN junction connector LH
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector RH)
      *b to Combination Meter Assembly
      *c to CAN Junction Connector LH

      Result

      Result Proceed to
      OK A
      NG (Combination meter assembly main line) B
      NG (CAN junction connector LH main line) C

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR RH 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH - COMBINATION METER ASSEMBLY) 

    Result: 

    C 

    See step  5

  5. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C LH (INSTRUMENT PANEL WIRE SIDE)) 
    1. Reconnect the G72 CAN junction connector RH.
    2. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY734885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      G71-4 (CANH) - G71-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN junction connector RH
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector LH (Instrument Panel Wire Side))
      *b to CAN Junction Connector RH

    Result: 

    NG 

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

    Result: 

    OK 

    See step  6

  6. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C LH (ENGINE ROOM MAIN WIRE SIDE)) 
    1. Reconnect the G71 CAN junction connector LH (instrument panel wire side).
    2. Disconnect the A51 CAN junction connector LH (engine room main wire side).
      GTY709368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A51-9 (CANH) - A51-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector LH (Engine Room Main Wire Side))
      *b to ECM

    Result: 

    OK 

    REPLACE CAN JUNCTION CONNECTOR LH 

    Result: 

    NG 

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

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