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Home >> Toyota >> 2021 >> Highlander Platinum, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Battery / Charging System (T24A-FTS) - Diagnostic Codes & Symptom Tests) >> Charging System >> DTC P161A-87: Lost Communication with Alternator Missing Message [11/2024 - ] >> Procedure

DTC P161A-87: Lost Communication with Alternator Missing Message [11/2024 - ]: Procedure

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  1. CHECK CHARGING SYSTEM 

    Refer to ON-VEHICLE INSPECTION [10/2022 - ] 

    Result

    Result Proceed to
    OK (w/ Stop and Start System) A
    OK (w/o Stop and Start System) B
    NG C

    Result: 

    B 

    See step  5

    Result: 

    C 

    REPAIR OR REPLACE CHARGING SYSTEM 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) 
    1. Disconnect the ECM connector.
    2. Disconnect the generator assembly connector.
    3. Disconnect the battery state sensor assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-44 (LIN) - C57-2 (LIN) Always Below 1 Ω
      A83-44 (LIN), C57-2 (LIN) or A86-2 (LIN) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CLEAR DTC 
    1. Check for DTCs, and then write them down.

      Powertrain > Engine > Trouble Codes 

    2. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    3. Turn the ignition switch off and wait 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC OUTPUT 
    1. Start the engine.
    2. Allow the engine to idle for approximately 17 minutes or more.
    3. Check for DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      Only DTC P161A-87 is output. A
      DTC P161A-87 and P162B-87 are output. B
      DTCs are not output. C

    Result: 

    A 

    REPLACE GENERATOR ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    C 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]

  5. CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) 
    1. Disconnect the ECM connector.
    2. Disconnect the generator assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-44 (LIN) - C57-2 (LIN) Always Below 1 Ω
      A83-44 (LIN) or C57-2 (LIN) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE GENERATOR ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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