LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2013 >> Prius Plug-in >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostic Codes (P0069-273 - P0A60-288)) (Plug-In) >> Hybrid Control System >> DTC P0A1A-200: Generator Control Module; DTC P0A1A-792: Generator Control Module; DTC P0A1A-793: Generator Control Module >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0A1A-200: Generator Control Module; DTC P0A1A-792: Generator Control Module; DTC P0A1A-793: Generator Control Module: Procedure

  1. 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 if DTCs are output.

      Result

      Result Proceed to
      Only P0A1A-200, 792 or 793 is output, or DTCs other than the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range / Performance
      P0A4D-255 Generator Position Sensor Circuit Low
    5. Turn the power switch off.

    B → See step   13 

    A: Go to next step 

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) See step   4 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.
      Fig 1: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)
      GTY337707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D29-11 (GRF) - Body ground Power switch on (IG) Below 1 V
      D29-12 (GRFG) - Body ground Power switch on (IG) Below 1 V
      D29-7 (GSN) - Body ground Power switch on (IG) Below 1 V
      D29-8 (GSNG) - Body ground Power switch on (IG) Below 1 V
      D29-10 (GCS) - Body ground Power switch on (IG) Below 1 V
      D29-9 (GCSG) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
      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.

    6. Disconnect the cable from the negative (-) auxiliary battery terminal.
    7. Turn the power switch off.
    8. Connect the inverter with converter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK GENERATOR RESOLVER 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)
      GTY337707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      D29-11 (GRF) - D29-12 (GRFG) Power switch off 7.1 to 21.6 Ω
      D29-7 (GSN) - D29-8 (GSNG) Power switch off 13.7 to 34.5 Ω
      D29-10 (GCS) - D29-9 (GCSG) Power switch off 12.8 to 32.4 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      D29-11 (GRF) or D29-12 (GRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D29-7 (GSN) or D29-8 (GSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D29-10 (GCS) or D29-9 (GCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Connect the inverter with converter assembly connector.

    NG → See step   9 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.
      Fig 3: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)
      GTY337708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D29-1 (MRF) - Body ground Power switch on (IG) Below 1 V
      D29-2 (MRFG) - Body ground Power switch on (IG) Below 1 V
      D29-3 (MSN) - Body ground Power switch on (IG) Below 1 V
      D29-4 (MSNG) - Body ground Power switch on (IG) Below 1 V
      D29-6 (MCS) - Body ground Power switch on (IG) Below 1 V
      D29-5 (MCSG) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
      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.

    6. Disconnect the cable from the negative (-) auxiliary battery terminal.
    7. Turn the power switch off.
    8. Connect the inverter with converter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK MOTOR RESOLVER 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 4: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)
      GTY337708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      D29-1 (MRF) - D29-2 (MRFG) Power switch off 7.1 to 21.6 Ω
      D29-3 (MSN) - D29-4 (MSNG) Power switch off 13.7 to 34.5 Ω
      D29-6 (MCS) - D29-5 (MCSG) Power switch off 12.8 to 32.4 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      D29-1 (MRF) or D29-2 (MRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D29-3 (MSN) or D29-4 (MSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D29-6 (MCS) or D29-5 (MCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Connect the inverter with converter assembly connector.

    NG → See step   11 

    OK: Go to next step 

  7. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) 
    1. Check the connection of the generator resolver connector.

      OK

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

      Fig 5: Identifying Generator Resolver Connector
      GTY342632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG → CONNECT SECURELY 

    OK: Go to next step 

  8. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) 
    1. Check the connection of the motor resolver connector.

      OK

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

      Fig 6: Identifying Motor Resolver Connector
      GTY338596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG → CONNECT SECURELY 

    OK → See step   14 

  9. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) 
    1. Check the connection of the generator resolver connector.

      OK

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

      Fig 7: Identifying Generator Resolver Connector
      GTY342632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG → CONNECT SECURELY 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Disconnect the generator resolver connector.
      Fig 8: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)
      GTY341308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      D7-1 (GRF) - D29-11 (GRF) Power switch off Below 1 Ω
      D7-5 (GRFG) - D29-12 (GRFG) Power switch off Below 1 Ω
      D7-2 (GSN) - D29-7 (GSN) Power switch off Below 1 Ω
      D7-6 (GSNG) - D29-8 (GSNG) Power switch off Below 1 Ω
      D7-3 (GCS) - D29-10 (GCS) Power switch off Below 1 Ω
      D7-7 (GCSG) - D29-9 (GCSG) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      D7-1 (GRF) or D29-11 (GRF) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-5 (GRFG) or D29-12 (GRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-2 (GSN) or D29-7 (GSN) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-6 (GSNG) or D29-8 (GSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-3 (GCS) or D29-10 (GCS) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-7 (GCSG) or D29-9 (GCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Generator Resolver)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)

      HINT: 

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

    5. Connect the generator resolver connector.
    6. Connect the inverter with converter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  11. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) 
    1. Check the connection of the motor resolver connector.

      OK

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

      Fig 9: Identifying Motor Resolver Connector
      GTY338596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG → CONNECT SECURELY 

    OK: Go to next step 

  12. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) 
    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 repair service information because this may cause a malfunction.

    2. Disconnect the connector D29 from the inverter with converter assembly.
    3. Disconnect the motor resolver connector.
      Fig 10: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)
      GTY324112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      D1-3 (MRF) - D29-1 (MRF) Power switch off Below 1 Ω
      D1-6 (MRFG) - D29-2 (MRFG) Power switch off Below 1 Ω
      D1-1 (MSN) - D29-3 (MSN) Power switch off Below 1 Ω
      D1-4 (MSNG) - D29-4 (MSNG) Power switch off Below 1 Ω
      D1-2 (MCS) - D29-6 (MCS) Power switch off Below 1 Ω
      D1-5 (MCSG) - D29-5 (MCSG) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      D1-3 (MRF) or D29-1 (MRF) - Body ground and other terminals Power switch off 10 kΩ or higher
      D1-6 (MRFG) or D29-2 (MRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D1-1 (MSN) or D29-3 (MSN) - Body ground and other terminals Power switch off 10 kΩ or higher
      D1-4 (MSNG) or D29-4 (MSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D1-2 (MCS) or D29-6 (MCS) - Body ground and other terminals Power switch off 10 kΩ or higher
      D1-5 (MCSG) or D29-5 (MCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Motor Resolver)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)

      HINT: 

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

    5. Connect the motor resolver connector.
    6. Connect the inverter with converter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  13. GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  14. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS 
  15. REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  COMPONENTS 
scientia non olet · About LEMON Manuals