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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 Line for Short to GND [11/2015 - ] >> Procedure

Check CAN Bus Line for Short to GND [11/2015 - ]: Procedure

  1. CHECK FOR SHORT TO GND IN CAN BUS LINE (CAN J/C RH) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the G72 CAN junction connector RH.
      GTY717450Courtesy 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) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Spiral cable with sensor sub-assembly (Steering sensor)
      G72-12 (CANL) - G4-4 (CG)
      G72-3 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Smart key ECU assembly (Certification ECU)*1
      G72-14 (CANL) - G4-4 (CG)
      G72-4 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Airbag sensor assembly
      G72-15 (CANL) - G4-4 (CG)
      G72-5 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      • Radio and display receiver assembly*2
      • Navigation receiver assembly*3
      G72-16 (CANL) - G4-4 (CG)
      G72-6 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Power steering ECU assembly
      G72-17 (CANL) - G4-4 (CG)
      G72-7 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Combination meter assembly
      G72-18 (CANL) - G4-4 (CG)
      G72-8 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Air conditioning amplifier assembly
      G72-19 (CANL) - G4-4 (CG)
      G72-9 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Main body ECU (Multiplex network body ECU)
      G72-20 (CANL) - G4-4 (CG)
      G72-10 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher CAN junction connector LH
      G72-21 (CANL) - G4-4 (CG)
      • *1: w/ Smart Key System
      • *2: for Radio and Display Type
      • *3: for Navigation Receiver Type
      TEXT IN ILLUSTRATION

      *1 DLC3
      *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 line) B
      NG (ECU or sensor bus line) C

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR RH 

    Result: 

    C 

    See step  4

    Result: 

    B 

    See step  2

  2. CHECK FOR SHORT TO GND IN CAN BUS LINE (CAN J/C LH (INSTRUMENT PANEL WIRE SIDE)) 
    1. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY722249Courtesy 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) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU
      G71-13 (CANL) - G4-4 (CG)
      G71-3 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher DLC3
      G71-14 (CANL) - G4-4 (CG)
      G71-4 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher CAN junction connector RH
      G71-15 (CANL) - G4-4 (CG)
      TEXT IN ILLUSTRATION

      *1 DLC3
      *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 bus line) B
      NG (CAN junction connector RH main line) C
      NG (DLC3 branch line) D

    Result: 

    B 

    See step  4

    Result: 

    C 

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

    Result: 

    D 

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3 

    Result: 

    A 

    See step  3

  3. CHECK FOR SHORT TO GND IN CAN BUS LINE (CAN J/C LH (ENGINE ROOM MAIN WIRE SIDE)) 
    1. Disconnect the A51 CAN junction connector LH (engine room main wire side).
      GTY690959Courtesy 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) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher ECM
      A51-20 (CANL) - G4-4 (CG)
      A51-10 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (Skid control ECU)
      A51-21 (CANL) - G4-4 (CG)
      TEXT IN ILLUSTRATION

      *1 DLC3
      *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 bus line) B

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR LH 

    Result: 

    B 

    See step  4

  4. CHECK FOR SHORT TO GND IN CAN BUS LINE (ECU, SENSOR) 
    1. Reconnect all wire harness connectors (CAN junction connector LH and CAN junction connector RH).
    2. Disconnect the ECU or sensor connected to the CAN bus line that is shorted to ground.

      HINT: 

      If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus lines. To determine the ECU or sensor that is connected to the shorted bus line, refer to the terminals of ECU tables (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.
      GTY724243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-6 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      G4-14 (CANL) - G4-4 (CG)
      TEXT IN ILLUSTRATION

      *1 DLC3

      HINT: 

      If the resistance changes to 200 Ω or higher 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 BUS LINE OR CONNECTOR 

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