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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery / Charging System (W/O Stop And Start System) (2GR-FKS) - Diagnostic Codes & Symptom Tests >> CHARGING SYSTEM (w/o Stop And Start System) >> DTC P161A-87: Lost Communication with Alternator Missing Message [12/2019 - 10/2022] >> Procedure

DTC P161A-87: Lost Communication with Alternator Missing Message [12/2019 - 10/2022]: Procedure

  1. CHECK CHARGING SYSTEM 

    Refer to ON-VEHICLE INSPECTION [12/2019 - 10/2022] 

    Result

    Result
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE CHARGING SYSTEM 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) 
    1. Disconnect the C54 ECM connector.
    2. Disconnect the C57 generator assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C54-135 (LIN) - C57-2 (LIN) Always Below 1 Ω
      C54-135 (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 [12/2019 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR