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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) >> Check CAN Bus Lines for Short Circuit [11/2015 - ] >> Procedure

Check CAN Bus Lines for Short Circuit [11/2015 - ]: Procedure

  1. CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY - CAN J/C RH) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the G1 combination meter assembly connector.
      GTY686232Courtesy 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
      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)

      HINT: 

      If the resistance becomes normal (between 108 to 132 Ω) when the connector is disconnected, there may be a short in the combination meter assembly.

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  2

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

      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)

      HINT: 

      If the resistance becomes normal (between 108 to 132 Ω) when the connector is disconnected, there may be a short in the ECM.

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  3

  3. CHECK FOR SHORT IN CAN BUS LINES (CAN J/C RH) 
    1. Reconnect the A40 ECM connector.
    2. Disconnect the G72 CAN junction connector RH.
      GTY720783Courtesy 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
      G72-1 (CANH) - G72-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Spiral cable with sensor sub-assembly (Steering sensor)
      G72-3 (CANH) - G72-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Smart key ECU assembly (Certification ECU)*1
      G72-4 (CANH) - G72-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Airbag sensor assembly
      G72-5 (CANH) - G72-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      • Radio and display receiver assembly*2
      • Navigation receiver assembly*3
      G72-6 (CANH) - G72-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Power steering ECU assembly
      G72-7 (CANH) - G72-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Combination meter assembly
      G72-8 (CANH) - G72-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Air conditioning amplifier assembly
      G72-9 (CANH) - G72-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Main body ECU (Multiplex network body ECU)
      G72-10 (CANH) - G72-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN junction connector LH
      • *1: w/ Smart Key System
      • *2: for Radio and Display Type
      • *3: for Navigation Receiver Type
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector RH)
      *b to Spiral Cable with Sensor Sub-assembly (Steering Sensor)
      *c to Smart Key ECU Assembly (Certification ECU)*1
      *d to Airbag Sensor Assembly
      *e
      • to Radio and display receiver assembly*2
      • to Navigation receiver assembly*3
      *f to Power Steering ECU Assembly
      *g to Combination Meter Assembly
      *h to Air Conditioning Amplifier Assembly
      *i to Main Body ECU (Multiplex Network Body ECU)
      *j to CAN Junction Connector LH
      • *1: w/ Smart Key System
      • *2: for Radio and Display Type
      • *3: for Navigation Receiver Type

      Result

      Result Proceed to
      OK A
      NG (CAN junction connector LH main lines) B
      NG (ECU or sensor branch lines) C
      NG (Combination meter assembly main lines) D

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR RH 

    Result: 

    C 

    See step  6

    Result: 

    D 

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

    Result: 

    B 

    See step  4

  4. CHECK FOR SHORT IN CAN BUS LINES (CAN J/C LH (INSTRUMENT PANEL WIRE SIDE)) 
    1. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY727581Courtesy 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 Connected to
      G71-2 (CANH) - G71-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU
      G71-3 (CANH) - G71-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher DLC3
      G71-4 (CANH) - G71-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher 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 Hybrid Vehicle Control ECU
      *c to DLC3
      *d to CAN Junction Connector RH

      Result

      Result Proceed to
      OK A
      NG (ECU or sensor branch lines) B
      NG (CAN junction connector RH main lines) C
      NG (DLC3 branch lines) D

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES (CAN J/C LH (INSTRUMENT PANEL WIRE SIDE) - CAN J/C RH) 

    Result: 

    D 

    REPAIR OR REPLACE CAN BRANCH LINES CONNECTED TO DLC3 

    Result: 

    A 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (CAN J/C LH (ENGINE ROOM MAIN WIRE SIDE)) 
    1. Disconnect the A51 CAN junction connector LH (engine room main wire side).
      GTY715453Courtesy 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 Connected to
      A51-9 (CANH) - A51-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      A51-10 (CANH) - A51-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (Skid control ECU)
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector LH (Engine Room Main Wire Side))
      *b to ECM
      *c to Brake Booster with Master Cylinder Assembly (Skid Control ECU)

      Result

      Result Proceed to
      OK A
      NG (ECU or sensor branch lines) B
      NG (ECM main lines) C

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR LH 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES (ECM - CAN J/C LH (ENGINE ROOM MAIN WIRE SIDE)) 

    Result: 

    B 

    See step  6

  6. CHECK FOR SHORT IN CAN BUS LINES (ECU, SENSOR) 
    1. Reconnect all wire harness connectors (CAN junction connector LH and CAN junction connector RH).
    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 [11/2015 - 06/2017] Refer to TERMINALS OF ECU [06/2017 - ] ).
    3. 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 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *1 DLC3

      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.

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

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