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Home >> Toyota >> 2022 >> Avalon XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Motor Generator Control System (Nickel Metal Hydride) - Diagnostic Codes (P0335-P0A7A)) >> MOTOR GENERATOR CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY) >> DTC P0A1B-1F: Generator Control Module Circuit Intermittent [04/2018 - 08/2020] >> Procedure

DTC P0A1B-1F: Generator Control Module Circuit Intermittent [04/2018 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota Avalon and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control and Motor Generator / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > Motor Generator > Trouble Codes 

      Result

      Result Proceed to
      P0A1B-1F only is output. A
      DTCs of hybrid control system in the tables below are output. B
      DTCs of motor generator control system in the tables below are output. C
      Malfunction Content System Relevant DTC
      Communication malfunction Motor generator control system P3124-87 Lost Communication between Drive Motor "A" and HV ECU Missing Message
      Hybrid control system P3123-87 Lost Communication with Missing Message
      U0110-87 Lost Communication with Drive Motor Control Module "A" Missing Message
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020] 

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020] 

    Result: 

    A 

    See step  2

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

    See step  3

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - IGCT RELAY) 
    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 information because this may cause a malfunction.

    2. Disconnect the A42 inverter with converter assembly connector.
    3. Remove the IGCT relay from the instrument panel relay block.
    4. Measure the resistance according to the value(s) in the table below.
      GTY841040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Relay Block *2 IGCT Relay
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-6 (+B) - 5 (IGCT relay) Power switch off Below 1 Ω
      A42-5 (+B2) - 5 (IGCT relay) Power switch off Below 1 Ω
      A42-24 (GND1) - Body ground Power switch off Below 1 Ω
      A42-23 (GND2) - Body ground Power switch off Below 1 Ω
    5. Install the IGCT relay.
    6. Reconnect the A42 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS. Refer to  DTC CHECK / CLEAR [04/2018 - 08/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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