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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes & Circuit Tests - (Hybrid) >> Can Communication System >> 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 [11/2016 - ] >> 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 [11/2016 - ]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      HINT: 

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

      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 [11/2016 - ]  

    Result: 

    A 

    See step  2

  2. CHECK LOCAL BUS 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY734804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      F137-31 (CA3P) - F137-30 (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
      F137-31 (CA3P) - F137-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      F137-30 (CA3N) - F137-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      F137-31 (CA3P) - F137-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      F137-30 (CA3N) - F137-3 (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 [11/2016 - ] 

    Result: 

    C 

    See step  6

    Result: 

    D 

    See step  10

    Result: 

    B 

    See step  3

  3. CHECK FOR OPEN IN LOCAL BUS MAIN LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the F137 hybrid vehicle control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F137-31 (CA3P) - F137-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      GTY687826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2016 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN LOCAL BUS MAIN LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F137 hybrid vehicle control ECU assembly connector.
    2. Disconnect the F112 No. 6 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      F112-8 (CANH) - F112-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      F112-9 (CANH) - F112-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU assembly
      GTY438470Courtesy 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

      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 LOCAL BUS MAIN LINES (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F112 No. 6 CAN junction connector.
    2. Disconnect the A43 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A43-12 (CAN+) - A43-25 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      GTY737045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [11/2016 - ] 

    Result: 

    NG 

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

  6. CHECK FOR SHORT IN LOCAL BUS LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the F137 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
      F137-31 (CA3P) - F137-30 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      GTY687826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2016 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK FOR SHORT IN LOCAL BUS LINES (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F137 hybrid vehicle control ECU assembly connector.
    2. Disconnect the F112 No. 6 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      F112-7 (CANH) - F112-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Skid control ECU assembly
      F112-8 (CANH) - F112-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      F112-9 (CANH) - F112-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Hybrid vehicle control ECU assembly
      GTY438326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 6 CAN Junction Connector)
      *b to Skid Control ECU Assembly
      *c to ECM
      *d to 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 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 LOCAL BUS LINES (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F112 No. 6 CAN junction connector.
    2. Disconnect the A43 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A43-12 (CAN+) - A43-25 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      GTY737045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [11/2016 - ] 

    Result: 

    NG 

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

  9. CHECK FOR SHORT IN LOCAL BUS LINES (SKID CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F112 No. 6 CAN junction connector.
    2. Disconnect the A63 skid control ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A63-10 (CA2H) - A63-11 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      GTY426640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 

  10. CHECK FOR SHORT IN LOCAL BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the F112 No. 6 CAN junction connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY428540Courtesy 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 Assembly
      *c to ECM *d to Hybrid Vehicle Control ECU Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose Connected to
      F112-7 (CANH) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Skid control ECU assembly
      F112-18 (CANL) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F112-8 (CANH) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short ECM
      F112-19 (CANL) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F112-9 (CANH) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Hybrid vehicle control ECU assembly
      F112-20 (CANL) - F25-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F112-7 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Skid control ECU assembly
      F112-18 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F112-8 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      F112-19 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F112-9 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Hybrid vehicle control ECU assembly
      F112-20 (CANL) - F25-16 (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 Local Bus inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Local Bus 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 assembly CAN branch line)
      • NG (+B short in skid control ECU 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 LOCAL BUS LINE (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the F137 hybrid vehicle control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      F137-31 (CA3P) - F137-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      F137-30 (CA3N) - F137-4 (E12) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      F137-31 (CA3P) - F137-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      F137-30 (CA3N) - F137-3 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL +B short
      GTY687822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

      HINT: 

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

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2016 - ] 

    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 LOCAL BUS LINE (ECM - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A43 and C1 ECM connectors.
    2. Measure the resistance according to the value(s) in the table below.
      GTY707072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)      		 - -

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      A43-12 (CAN+) - C1-53 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A43-25 (CAN-) - C1-53 (E1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      A43-12 (CAN+) - A43-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A43-25 (CAN-) - A43-1 (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 Local Bus inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Local Bus inspection.

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [11/2016 - ] 

    Result: 

    NG 

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

  13. CHECK FOR SHORT IN LOCAL BUS LINE (SKID CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A63 skid control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Purpose Specified Condition
      A63-10 (CA2H) - A63-3 (GND2) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH ground short 200 Ω or higher
      A63-11 (CA2L) - A63-3 (GND2) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL ground short
      A63-10 (CA2H) - A63-4 (+BI1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANH +B short 6 kΩ or higher
      A63-11 (CA2L) - A63-4 (+BI1) Cable disconnected from negative (-) auxiliary battery terminal Inspection for CANL +B short
      GTY426641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)

      HINT: 

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

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 6 CAN JUNCTION CONNECTOR) 

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