HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A1B-168, P0A1B-795, P0A1B-796

DTC Code DTC Name
P0A1B-168 Drive Motor "A" Control Module
P0A1B-795 Drive Motor "A" Control Module
P0A1B-796 Drive Motor "A" Control Module

DESCRIPTION

The inverter with converter assembly (MG ECU) monitors its internal operation and detects malfunctions.

Tech Tips

The term "drive motor A" indicates MG2.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A1B 168 The difference between the resolver angle for control and estimated resolver angle exceeds the allowable value.

  • Inverter with converter assembly

  • Hybrid vehicle transmission assembly

  • Wire harness or connector
P0A1B 795 Resolver REF signal cycle error
P0A1B 796 Resolver REF signal oscillation stop error

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A1A-200 Click here.

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0A1B-168 , 795 or 796 only is output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low

    B

    GO TO DTC CHART Click here

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.

    Note

    Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector cannot be pulled out.


    1. Turn the power switch off.

    2. Remove the service plug grip Click here.

      Note

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

    3. Check the connection of the low voltage connector of the inverter with converter assembly.

      OK
      The connector is connected securely and there are no contact problems.

      Tech Tips

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.


    NG

    CONNECT SECURELY

    OK

  3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)


    1. A00106EE02

      Disconnect the low voltage connector from the inverter with converter assembly.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-20 (GRF) - Body ground Power switch on (IG) Below 1 V
      A79-9 (GRFG) - Body ground Power switch on (IG) Below 1 V
      A79-18 (GSN) - Body ground Power switch on (IG) Below 1 V
      A79-7 (GSNG) - Body ground Power switch on (IG) Below 1 V
      A79-17 (GCS) - Body ground Power switch on (IG) Below 1 V
      A79-6 (GCSG) - Body ground Power switch on (IG) Below 1 V
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-20 (GRF) - Body ground Power switch on (IG) Below 1 V
      A88-9 (GRFG) - Body ground Power switch on (IG) Below 1 V
      A88-18 (GSN) - Body ground Power switch on (IG) Below 1 V
      A88-7 (GSNG) - Body ground Power switch on (IG) Below 1 V
      A88-17 (GCS) - Body ground Power switch on (IG) Below 1 V
      A88-6 (GCSG) - Body ground Power switch on (IG) Below 1 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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK GENERATOR RESOLVER


    1. A00106EE02

      Turn the power switch off.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-20 (GRF) - A79-9 (GRFG) Power switch off 4.2 to 12.5 Ω
      A79-18 (GSN) - A79-7 (GSNG) Power switch off 9.8 to 20.1 Ω
      A79-17 (GCS) - A79-6 (GCSG) Power switch off 9.8 to 20.1 Ω
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-20 (GRF) - A88-9 (GRFG) Power switch off 4.2 to 12.5 Ω
      A88-18 (GSN) - A88-7 (GSNG) Power switch off 9.8 to 20.1 Ω
      A88-17 (GCS) - A88-6 (GCSG) Power switch off 9.8 to 20.1 Ω
      Standard resistance (Check for short)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-20 (GRF) or A79-9 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-18 (GSN) or A79-7 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-17 (GCS) or A79-6 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-20 (GRF) or A88-9 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-18 (GSN) or A88-7 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-17 (GCS) or A88-6 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher

    NG

    CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)


    1. Turn the power switch on (IG).

    2. A000UOIE02

      Measure the voltage according to the value(s) in the table below.

      Standard voltage
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-40 (MRF) - Body ground Power switch on (IG) Below 1 V
      A79-29 (MRFG) - Body ground Power switch on (IG) Below 1 V
      A79-39 (MSN) - Body ground Power switch on (IG) Below 1 V
      A79-28 (MSNG) - Body ground Power switch on (IG) Below 1 V
      A79-38 (MCS) - Body ground Power switch on (IG) Below 1 V
      A79-27 (MCSG) - Body ground Power switch on (IG) Below 1 V
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-40 (MRF) - Body ground Power switch on (IG) Below 1 V
      A88-29 (MRFG) - Body ground Power switch on (IG) Below 1 V
      A88-39 (MSN) - Body ground Power switch on (IG) Below 1 V
      A88-28 (MSNG) - Body ground Power switch on (IG) Below 1 V
      A88-38 (MCS) - Body ground Power switch on (IG) Below 1 V
      A88-27 (MCSG) - Body ground Power switch on (IG) Below 1 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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK MOTOR RESOLVER


    1. Turn the power switch off.

    2. A000UOIE02

      Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-40 (MRF) - A79-29 (MRFG) Power switch off 4.5 to 16.8 Ω
      A79-39 (MSN) - A79-28 (MSNG) Power switch off 9.3 to 27.8 Ω
      A79-38 (MCS) - A79-27 (MCSG) Power switch off 12.4 to 30.7 Ω
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-40 (MRF) - A88-29 (MRFG) Power switch off 4.5 to 16.8 Ω
      A88-39 (MSN) - A88-28 (MSNG) Power switch off 9.3 to 27.8 Ω
      A88-38 (MCS) - A88-27 (MCSG) Power switch off 12.4 to 30.7 Ω
      Standard resistance (Check for short)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-40 (MRF) or A79-29 (MRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-39 (MSN) or A79-28 (MSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-38 (MCS) or A79-27 (MCSG) - Body ground and other terminals Power switch off 1 MΩ or higher
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-40 (MRF) or A88-29 (MRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-39 (MSN) or A88-28 (MSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-38 (MCS) or A88-27 (MCSG) - Body ground and other terminals Power switch off 1 MΩ or higher

    NG

    CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) Click here

    OK

  7. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)


    1. Check the connection condition of the generator resolver connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      OK
      The connector is connected securely and there are no contact problems.

      Note

      If the terminals connect poorly, are damaged, or contain water or foreign matter, repair or replace the wire harness or connector.


    NG

    CONNECT SECURELY

    OK

  8. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)


    1. Check the connection condition of the motor resolver connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      OK
      The connector is connected securely and there are no contact problems.

      Note

      If the terminals connect poorly, are damaged, or contain water or foreign matter, repair or replace the wire harness or connector.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    CONNECT SECURELY

  9. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)


    1. Check the connection condition of the generator resolver connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      OK
      The connector is connected securely and there are no contact problems.

      Note

      If the terminals connect poorly, are damaged, or contain water or foreign matter, repair or replace the wire harness or connector.


    NG

    CONNECT SECURELY

    OK

  10. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)


    1. A000WPZE02

      Disconnect the generator resolver connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-20 (GRF) - E62-1 (GRF) Power switch off Below 1 Ω
      A79-9 (GRFG) - E62-5 (GRFG) Power switch off Below 1 Ω
      A79-18 (GSN) - E62-2 (GSN) Power switch off Below 1 Ω
      A79-7 (GSNG) - E62-6 (GSNG) Power switch off Below 1 Ω
      A79-17 (GCS) - E62-3 (GCS) Power switch off Below 1 Ω
      A79-6 (GCSG) - E62-7 (GCSG) Power switch off Below 1 Ω
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-20 (GRF) - E62-1 (GRF) Power switch off Below 1 Ω
      A88-9 (GRFG) - E62-5 (GRFG) Power switch off Below 1 Ω
      A88-18 (GSN) - E62-2 (GSN) Power switch off Below 1 Ω
      A88-7 (GSNG) - E62-6 (GSNG) Power switch off Below 1 Ω
      A88-17 (GCS) - E62-3 (GCS) Power switch off Below 1 Ω
      A88-6 (GCSG) - E62-7 (GCSG) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-20 (GRF) or E62-1 (GRF) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-9 (GRFG) or E62-5 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-18 (GSN) or E62-2 (GSN) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-7 (GSNG) or E62-6 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-17 (GCS) or E62-3 (GCS) - Body ground and other terminals Power switch off 1 MΩ or higher
      A79-6 (GCSG) or E62-7 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-20 (GRF) or E62-1 (GRF) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-9 (GRFG) or E62-5 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-18 (GSN) or E62-2 (GSN) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-7 (GSNG) or E62-6 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-17 (GCS) or E62-3 (GCS) - Body ground and other terminals Power switch off 1 MΩ or higher
      A88-6 (GCSG) or E62-7 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher

      Tech Tips

      The generator resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.


    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)


    1. Check the connection condition of the motor resolver connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      OK
      The connector is connected securely and there are no contact problems.

      Note

      If the terminals connect poorly, are damaged, or contain water or foreign matter, repair or replace the wire harness or connector.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    NG

    CONNECT SECURELY

    OK

  12. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)


    1. Turn the power switch on (IG).

    2. A000UOIE02

      Measure the voltage according to the value(s) in the table below.

      Standard voltage
      LHD
      Tester Connection Switch Condition Specified Condition
      A79-40 (MRF) - Body ground Power switch on (IG) Below 1 V
      A79-29 (MRFG) - Body ground Power switch on (IG) Below 1 V
      A79-39 (MSN) - Body ground Power switch on (IG) Below 1 V
      A79-28 (MSNG) - Body ground Power switch on (IG) Below 1 V
      A79-38 (MCS) - Body ground Power switch on (IG) Below 1 V
      A79-27 (MCSG) - Body ground Power switch on (IG) Below 1 V
      RHD
      Tester Connection Switch Condition Specified Condition
      A88-40 (MRF) - Body ground Power switch on (IG) Below 1 V
      A88-29 (MRFG) - Body ground Power switch on (IG) Below 1 V
      A88-39 (MSN) - Body ground Power switch on (IG) Below 1 V
      A88-28 (MSNG) - Body ground Power switch on (IG) Below 1 V
      A88-38 (MCS) - Body ground Power switch on (IG) Below 1 V
      A88-27 (MCSG) - Body ground Power switch on (IG) Below 1 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.


    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR