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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) >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with HV ECU [11/2015 - 06/2017] >> Procedure

DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with HV ECU [11/2015 - 06/2017]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      HINT: 

      If the hybrid vehicle control ECU outputs only DTC U0129, troubleshoot DTC U0129 and check the branch circuit of sub bus 15.

      Result

      Result Proceed to
      The hybrid vehicle control ECU outputs DTC U0129 and other DTCs.
      (Techstream display: Hybrid Control)      		 A
      The hybrid vehicle control ECU outputs only DTC U0129.
      (Techstream display: Hybrid Control)      		 B

    Result: 

    B 

    REFER TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC 

    Refer to DTC U0129: Lost Communication with Brake System Control Module [11/2015 - ] )

    Result: 

    A 

    See step  2

  2. CHECK SUB BUS 15 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY687174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      G58-31 (CA3P) - G58-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or higher: Open circuit in main bus lines
      G58-31 (CA3P) - G57-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G58-30 (CA3N) - G57-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Hybrid Vehicle Control ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      G58-31 (CA3P) - G58-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G58-30 (CA3N) - G58-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      HINT: 

      • When the values are as specified, clear and recheck for DTCs. When no DTCs are output, check for malfunctions such as damage or improper connection of the relevant connectors.
      • If DTCs are output although the bus circuit is normal and DTCs were cleared, replace the hybrid vehicle control ECU.

      Result

      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus lines) B
      NG (Short circuit between bus lines) C
      • NG (Ground short)
      • NG (+B short)
      		 D

    Result: 

    A 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    C 

    See step  7

    Result: 

    D 

    See step  12

    Result: 

    B 

    See step  3

  3. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the G58 hybrid vehicle control ECU connector.
      GTY726531Courtesy 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
      G58-31 (CA3P) - G58-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN J/C LH) 
    1. Reconnect the G58 hybrid vehicle control ECU connector.
    2. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY728208Courtesy 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
      G71-10 (CANH) - G71-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU
      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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - CAN J/C LH) 

    Result: 

    OK 

    See step  5

  5. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN J/C LH) 
    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).
      GTY691776Courtesy 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
      A51-3 (CANH) - A51-14 (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 

    See step  6

  6. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - CAN J/C LH) 
    1. Reconnect the A51 CAN junction connector LH (engine room main wire side).
    2. Disconnect the A40 ECM connector.
      GTY692423Courtesy 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
      A40-12 (CANP) - A40-25 (CANN) 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 

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

  7. CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU - CAN J/C LH) 
    1. Disconnect the G58 hybrid vehicle control ECU connector.
      GTY726531Courtesy 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
      G58-31 (CA3P) - G58-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  8

  8. CHECK FOR SHORT IN SUB BUS 15 LINES (CAN J/C LH) 
    1. Reconnect the G58 hybrid vehicle control ECU connector.
    2. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY728208Courtesy 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
      G71-10 (CANH) - G71-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU
      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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - CAN J/C LH) 

    Result: 

    OK 

    See step  9

  9. CHECK FOR SHORT IN SUB BUS 15 LINES (CAN J/C LH) 
    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).
      GTY721080Courtesy 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
      A51-1 (CANH) - A51-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (Skid control ECU)
      A51-3 (CANH) - A51-14 (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 Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to ECM

      Result

      Result Proceed to
      OK A
      NG (ECM CAN main bus lines) B
      NG (Brake booster with master cylinder assembly (Skid control ECU) CAN branch lines) C

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR LH 

    Result: 

    C 

    See step  11

    Result: 

    B 

    See step  10

  10. CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN J/C LH) 
    1. Reconnect the A51 CAN junction connector LH (engine room main wire side).
    2. Disconnect the A40 ECM connector.
      GTY692423Courtesy 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
      A40-12 (CANP) - A40-25 (CANN) 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 

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

  11. CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CAN J/C LH) 
    1. Reconnect the A51 CAN junction connector LH (engine room main wire side).
    2. Disconnect the A41 brake booster with master cylinder assembly (skid control ECU) connector.
      GTY705091Courtesy 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
      A41-35 (CA2H) - A41-34 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))

    Result: 

    OK 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CAN J/C LH) 

  12. CHECK FOR SHORT IN SUB BUS 15 LINE (CAN J/C LH) 
    1. Disconnect the G71 CAN junction connector LH (instrument panel wire side).
      GTY696645Courtesy 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
      G71-10 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU
      G71-21 (CANL) - G4-4 (CG)
      G71-10 (CANH) - G4-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Hybrid vehicle control ECU
      G71-21 (CANL) - G4-16 (BAT)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 15 inspection.
      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

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  13

  13. CHECK FOR SHORT IN SUB BUS 15 LINE (CAN J/C LH) 
    1. Disconnect the A51 CAN junction connector LH (engine room main wire side).
      GTY699199Courtesy 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
      A51-1 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Brake booster with master cylinder assembly (Skid control ECU)
      A51-12 (CANL) - G4-4 (CG)
      A51-3 (CANH) - G4-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher ECM
      A51-14 (CANL) - G4-4 (CG)
      A51-1 (CANH) - G4-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Brake booster with master cylinder assembly (Skid control ECU)
      A51-12 (CANL) - G4-16 (BAT)
      A51-3 (CANH) - G4-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher ECM
      A51-14 (CANL) - G4-16 (BAT)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 15 inspection.
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Front view of wire harness connector
      (to CAN Junction Connector LH (Engine Room Main Wire Side))
      *b to Brake Booster with Master Cylinder Assembly (Skid Control ECU)
      *c to ECM

      Result

      Result Proceed to
      OK A
      NG (ECM CAN main bus line) B
      NG (Brake booster with master cylinder assembly (Skid control ECU) CAN branch line) C

    Result: 

    A 

    REPLACE CAN JUNCTION CONNECTOR LH 

    Result: 

    B 

    See step  15

    Result: 

    C 

    See step  16

  14. CHECK FOR SHORT IN SUB BUS 15 LINE (HYBRID VEHICLE CONTROL ECU - CAN J/C LH) 
    1. Disconnect the G57 and G58 hybrid vehicle control ECU connectors.
      GTY732523Courtesy 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
      G58-31 (CA3P) - G57-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      G58-30 (CA3N) - G57-6 (E1)
      G58-31 (CA3P) - G58-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      G58-30 (CA3N) - G58-1 (BATT)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 15 inspection.
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - CAN J/C LH) 

  15. CHECK FOR SHORT IN SUB BUS 15 LINE (ECM - CAN J/C LH) 
    1. Disconnect the A40 and C10 ECM connectors.
      GTY707082Courtesy 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
      A40-12 (CANP) - C10-16 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      A40-25 (CANN) - C10-16 (E1)
      A40-12 (CANP) - A40-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      A40-25 (CANN) - A40-1 (BATT)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 15 inspection.
      TEXT IN ILLUSTRATION

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

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

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

  16. CHECK FOR SHORT IN SUB BUS 15 LINE (BRAKE BOOSTER WITH MASTER CYLINDER - CAN J/C LH) 
    1. Disconnect the A41 brake booster with master cylinder assembly (skid control ECU) connector.
      GTY738913Courtesy 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
      A41-35 (CA2H) - A41-28 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      A41-34 (CA2L) - A41-28 (GND)
      A41-35 (CA2H) - A41-14 (BI) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      A41-34 (CA2L) - A41-14 (BI)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 15 inspection.
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))

    Result: 

    OK 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CAN J/C LH) 

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