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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Central Gateway Ecu) - Diagnostic Codes - (Hybrid) >> CAN COMMUNICATION SYSTEM (w/o Central Gateway ECU) >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [10/2015 - ] >> Procedure

DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [10/2015 - ]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      HINT: 

      If the hybrid vehicle control ECU assembly 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 assembly outputs DTC U0129 and other DTCs.
      (Techstream display: Hybrid Control)      		 A
      The hybrid vehicle control ECU assembly outputs only DTC U0129.
      (Techstream display: Hybrid Control)      		 B

    Result: 

    B 

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC 

    (Refer to DTC U0129: Lost Communication with Brake System Control Module [10/2015 - ] )

    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.
      GTY602545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D136-31 (CA3P) - D136-30 (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 a main bus line
      D136-31 (CA3P) - D135-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      D136-30 (CA3N) - D135-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      D136-31 (CA3P) - D136-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      D136-30 (CA3N) - D136-3 (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 assembly.

      Result

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

    Result: 

    A 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    (Refer to REMOVAL [10/2015 - ] )

    Result: 

    C 

    See step  6

    Result: 

    D 

    See step  10

    Result: 

    B 

    See step  3

  3. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the D136 hybrid vehicle control ECU assembly connector.
      GTY573471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D136-31 (CA3P) - D136-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    (Refer to REMOVAL [10/2015 - ] )

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D136 hybrid vehicle control ECU assembly connector.
    2. Disconnect the A59 No. 6 CAN junction connector.
      GTY546191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)
      *b to ECM
      *c to Hybrid Vehicle Control ECU Assembly
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A59-2 (CANH) - A59-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      A59-3 (CANH) - A59-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU assembly

      Result

      Result Proceed to
      OK A
      NG (Open circuit in hybrid vehicle control ECU assembly CAN main bus line) B
      NG (Open circuit in ECM CAN main bus line) C

    Result: 

    A 

    REPLACE NO. 6 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    See step  5

  5. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A59 No. 6 CAN junction connector.
    2. Disconnect the A18 ECM connector.
      GTY540692Courtesy 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
      A18-12 (CANP) - A18-25 (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 [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

  6. CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the D136 hybrid vehicle control ECU assembly connector.
      GTY573471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D136-31 (CA3P) - D136-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    (Refer to REMOVAL [10/2015 - ] )

    Result: 

    NG 

    See step  7

  7. CHECK FOR SHORT IN SUB BUS 15 LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D136 hybrid vehicle control ECU assembly connector.
    2. Disconnect the A59 No. 6 CAN junction connector.
      GTY577238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to CAN No. 6 Junction Connector)
      *b to Skid Control ECU (Brake Booster with Master Cylinder Assembly)
      *c to ECM
      *d to Hybrid Vehicle Control ECU Assembly
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A59-1 (CANH) - A59-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Skid control ECU (brake booster with master cylinder assembly)
      A59-2 (CANH) - A59-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      A59-3 (CANH) - A59-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU assembly

      Result

      Result Proceed to
      OK A
      NG (Short circuit between bus lines in hybrid vehicle control ECU assembly CAN main bus line) B
      NG (Short circuit between bus lines in ECM CAN main bus line) C
      NG (Short circuit between bus lines in skid control ECU (brake booster with master cylinder assembly) CAN branch line) D

    Result: 

    A 

    REPLACE NO. 6 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 

    Result: 

    D 

    See step  9

    Result: 

    C 

    See step  8

  8. CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A59 No. 6 CAN junction connector.
    2. Disconnect the A18 ECM connector.
      GTY540692Courtesy 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
      A18-12 (CANP) - A18-25 (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 [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

  9. CHECK FOR SHORT IN SUB BUS 15 LINES (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A59 No. 6 CAN junction connector.
    2. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY559677Courtesy 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
      A51-35 (CA2H) - A51-34 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

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

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)) 

  10. CHECK FOR SHORT IN SUB BUS 15 LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A59 No. 6 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY553731Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)
      *b to Skid Control ECU (Brake Booster with Master Cylinder Assembly)
      *c to ECM
      *d to Hybrid Vehicle Control ECU Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose Connected to
      A59-1 (CANH) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Skid control ECU (brake booster with master cylinder assembly)
      A59-7 (CANL) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A59-2 (CANH) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short ECM
      A59-8 (CANL) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A59-3 (CANH) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Hybrid vehicle control ECU assembly
      A59-9 (CANL) - D28-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      A59-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Skid control ECU (brake booster with master cylinder assembly)
      A59-7 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A59-2 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      A59-8 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A59-3 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Hybrid vehicle control ECU assembly
      A59-9 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short

      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 Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

      Result

      Result Proceed to
      OK A
      • NG (Ground short in hybrid vehicle control ECU assembly CAN main bus line)
      • NG (+B short in hybrid vehicle control ECU assembly CAN main bus line)
      		 B
      • NG (Ground short in ECM CAN main bus line)
      • NG (+B short in ECM CAN main bus line)
      		 C
      • NG (Ground short in skid control ECU (brake booster with master cylinder assembly) CAN branch line)
      • NG (+B short in skid control ECU (brake booster with master cylinder assembly) CAN branch line)
      		 D

    Result: 

    A 

    REPLACE NO. 6 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  12

    Result: 

    D 

    See step  13

    Result: 

    B 

    See step  11

  11. CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D135 hybrid vehicle control ECU assembly connector.
    2. Disconnect the D136 hybrid vehicle control ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY545499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      D136-31 (CA3P) - D135-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      D136-30 (CA3N) - D135-6 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      D136-31 (CA3P) - D136-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      D136-30 (CA3N) - D136-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL +B short

      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 Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    (Refer to REMOVAL [10/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 

  12. CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A18 ECM connector.
      GTY544353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      A18-12 (CANP) - B51-16 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A18-25 (CANN) - B51-16 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      A18-12 (CANP) - A18-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A18-25 (CANN) - A18-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL +B short

      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 Purpose 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 [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

  13. CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY583266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      A51-35 (CA2H) - A51-28 (GND) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A51-34 (CA2L) - A51-28 (GND) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      A51-35 (CA2H) - A51-15 (BS) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A51-34 (CA2L) - A51-15 (BS) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL +B short

      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 Purpose 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 Skid Control ECU (Brake Booster with Master Cylinder Assembly))

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)) 

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