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Home >> Audi >> 2018 >> A6 Premium Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Hybrid Control System (Diagnostic Codes (P0C73-776 - U0424-537) & Circuit Tests))) >> Hybrid Control System >> DTC U0110-159: Lost Communication with Drive Motor Control Module "A"; DTC U0110-656: Lost Communication with Drive Motor Control Module "A"; DTC U0110-657: Lost Communication with Drive Motor Control Module "A" [08/2013 - ] >> Procedure

DTC U0110-159: Lost Communication with Drive Motor Control Module "A"; DTC U0110-656: Lost Communication with Drive Motor Control Module "A"; DTC U0110-657: Lost Communication with Drive Motor Control Module "A" [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE (INV) 
    1. Remove the INV fuse from the No. 2 engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.
      GTY318219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV fuse terminals Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 No. 2 Engine Room Relay Block
      *2 INV Fuse
    3. Install the INV fuse.

    NG → See step   18 

    OK: Go to next step 

  2. CLEAR DTC. Refer to  PROCEDURE - Step 4 

    NEXT: Go to next step 

  3. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Result

      Result Proceed to
      DTC U0110-159, 656 or 657 is output. A
      DTC U0110-159, 656 and 657 are not output. B
    5. Turn the power switch off.

    B → See step   27 

    A: Go to next step 

  4. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 9 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  5. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 10 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  6. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1). Refer to  PROCEDURE - Step 11 

    NG → See step   22 

    OK: Go to next step 

  7. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2). Refer to  PROCEDURE - Step 12 

    NG → See step   24 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Disconnect the A14 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY320139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A14-10 (GND1) - Body ground Power switch off Below 1 Ω
      A14-11 (GND2) - Body ground Power switch off Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A14-30 (+B) - Body ground Power switch on (IG) 11 to 14 V
      A14-31 (+B2) - Body ground Power switch on (IG) 11 to 14 V
      NOTE:

      Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.
    8. Reconnect the A14 inverter with converter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM) 
    1. Connect an oscilloscope between the power management control ECU terminals specified in the following table.
    2. Turn the power switch on (IG).
    3. Measure the waveform.
      GTY400609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Tester Connection CH1: A33-21 (CLK+) - H1-6 (E1)
      CH2: A33-20 (CLK-) - H1-6 (E1)
      Equipment Setting 1 V/DIV., 1 μs./DIV.
      Condition Power switch on (IG)

      Result

      Result Proceed to
      The waveform appears as shown in the illustration. A
      The waveform differs from the one shown in the illustration. B
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

      HINT: 

      • Inspect with the connector connected.
      • If pulses are generated, the shape of the waveform can be assumed to be normal.
      • The shape of the waveform may vary according to communication conditions.
    4. Turn the power switch off.

    B → See step   12 

    A: Go to next step 

  10. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM) 
    1. Connect an oscilloscope between the power management control ECU terminals specified in the following table.
    2. Turn the power switch on (IG).
    3. Measure the waveform.
      GTY418358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Tester Connection CH1: A33-33 (REQ+) - H1-6 (E1)
      CH2: A33-32 (REQ-) - H1-6 (E1)
      Equipment Setting 1 V/DIV., 1 ms./DIV.
      Condition Power switch on (IG)

      Result

      Result Proceed to
      The waveform appears as shown in the illustration. A
      The waveform differs from the one shown in the illustration. B
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

      HINT: 

      • Inspect with the connector connected.
      • If pulses are generated, the shape of the waveform can be assumed to be normal.
      • The shape of the waveform may vary according to communication conditions.
    4. Turn the power switch off.

    B → See step   14 

    A: Go to next step 

  11. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM) 
    1. Connect an oscilloscope between the power management control ECU terminals specified in the following table.
    2. Turn the power switch on (IG).
    3. Measure the waveform.
      GTY409061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Tester Connection CH1: A33-30 (MTH+) - H1-6 (E1)
      CH2: A33-29 (MTH-) - H1-6 (E1)
      Equipment Setting 1 V/DIV., 200 μs./DIV.
      Condition Power switch on (IG)

      Result

      Result Proceed to
      The waveform appears as shown in the illustration. A
      The waveform differs from the one shown in the illustration. B
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

      HINT: 

      • Inspect with the connector connected.
      • If pulses are generated, the shape of the waveform can be assumed to be normal.
      • The shape of the waveform may vary according to communication conditions.
    4. Turn the power switch off.

    B → See step   16 

    A → See step   26 

  12. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Disconnect the A33 power management control ECU connector.
    3. Disconnect the A14 inverter with converter assembly connector.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.
      GTY410352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-21 (CLK+) - Body ground Power switch on (IG) Below 1 V
      A33-20 (CLK-) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)
      NOTE:

      Turning the power switch on (IG) with the power management control ECU connector and the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A33-21 (CLK+) - A14-7 (CLK+) Power switch off Below 1 Ω
      A33-20 (CLK-) - A14-18 (CLK-) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A33-21 (CLK+) or A14-7 (CLK+) - Body ground and other terminals Power switch off 10 kΩ or higher
      A33-20 (CLK-) or A14-18 (CLK-) - Body ground and other terminals Power switch off 10 kΩ or higher
    9. Disconnect the cable from the negative (-) auxiliary battery terminal.
    10. Reconnect the A14 inverter with converter assembly connector.
    11. Reconnect the A33 power management control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  13. CHECK INVERTER WITH CONVERTER ASSEMBLY 
    1. Disconnect the A33 power management control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY406664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-21 (CLK+) - A33-20 (CLK-) Power switch off 80 to 170 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
    3. Reconnect the A33 power management control ECU connector.

    NG → See step   28 

    OK → See step   26 

  14. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Disconnect the A33 power management control ECU connector.
    3. Disconnect the A14 inverter with converter assembly connector.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.
      GTY410351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-33 (REQ+) - Body ground Power switch on (IG) Below 1 V
      A33-32 (REQ-) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)
      NOTE:

      Turning the power switch on (IG) with the power management control ECU connector and the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A33-33 (REQ+) - A14-26 (REQ+) Power switch off Below 1 Ω
      A33-32 (REQ-) - A14-37 (REQ-) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A33-33 (REQ+) or A14-26 (REQ+) - Body ground and other terminals Power switch off 10 kΩ or higher
      A33-32 (REQ-) or A14-37 (REQ-) - Body ground and other terminals Power switch off 10 kΩ or higher
    9. Disconnect the cable from the negative (-) auxiliary battery terminal.
    10. Reconnect the A14 inverter with converter assembly connector.
    11. Reconnect the A33 power management control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  15. CHECK INVERTER WITH CONVERTER ASSEMBLY 
    1. Disconnect the A33 power management control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY406666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-33 (REQ+) - A33-32 (REQ-) Power switch off 80 to 170 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
    3. Reconnect the A33 power management control ECU connector.

    NG → See step   28 

    OK → See step   26 

  16. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Disconnect the A33 power management control ECU connector.
    3. Disconnect the A14 inverter with converter assembly connector.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.
      GTY410350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-30 (MTH+) - Body ground Power switch on (IG) Below 1 V
      A33-29 (MTH-) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)
      NOTE:

      Turning the power switch on (IG) with the power management control ECU connector and the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A33-30 (MTH+) - A14-8 (MTH+) Power switch off Below 1 Ω
      A33-29 (MTH-) - A14-19 (MTH-) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A33-30 (MTH+) or A14-8 (MTH+) - Body ground and other terminals Power switch off 10 kΩ or higher
      A33-29 (MTH-) or A14-19 (MTH-) - Body ground and other terminals Power switch off 10 kΩ or higher
    9. Disconnect the cable from the negative (-) auxiliary battery terminal.
    10. Reconnect the A14 inverter with converter assembly connector.
    11. Reconnect the A33 power management control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  17. CHECK POWER MANAGEMENT CONTROL ECU 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Disconnect the A14 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY416254Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-30 (MTH+) - A33-29 (MTH-) Power switch off 80 to 170 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)
    4. Reconnect the A14 inverter with converter assembly connector.

    NG → See step   26 

    OK → See step   28 

  18. REPLACE FUSE (INV) 
    1. Replace the INV fuse.
      GTY318219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 No. 2 Engine Room Relay Block
      *2 INV Fuse
    2. Turn the power switch on (READY).
    3. Check if there is an open circuit in the INV fuse in the No. 2 engine room relay block.

      OK

      There is no open circuit in the INV fuse.

      HINT: 

      If the fuse does not become open again after turning the power switch on (READY), it can be assumed that the previous fuse failed due to age.

    4. Turn the power switch off.

    NG → See step   19 

    OK → COMPLETED 

  19. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - INV FUSE) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

    2. Remove the INV fuse from the No. 2 engine room relay block.
      GTY318219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 No. 2 Engine Room Relay Block
      *2 INV Fuse
    3. Disconnect the A14 inverter with converter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.
      GTY320863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 No. 2 Engine Room Relay Block *2 INV Fuse
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)      		 - -

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A14-30 (+B), A14-31 (+B2) or 2 (INV fuse terminal) - Body ground and other terminals Power switch off 10 kΩ or higher
    5. Reconnect the A14 inverter with converter assembly connector.
    6. Install the INV fuse.

    NG → See step   21 

    OK: Go to next step 

  20. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to COMPONENTS [08/2013 - ]

    NEXT → REPLACE FUSE (INV) 

  21. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (INV) 

  22. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 26 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  23. CHECK GENERATOR CABLE. Refer to  PROCEDURE - Step 27 

    NG → See step   29 

    OK → See step   31 

  24. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 28 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  25. CHECK MOTOR CABLE. Refer to  PROCEDURE - Step 29 

    NG → See step   30 

    OK → See step   31 

  26. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS [08/2013 - ] 
  27. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2013 - ] 
  28. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS [08/2013 - ] 
  29. REPLACE GENERATOR CABLE. Refer to  COMPONENTS [08/2013 - ] 
  30. REPLACE MOTOR CABLE. Refer to  COMPONENTS [08/2013 - ] 
  31. REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  COMPONENTS [08/2013 - ] 
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