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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 34 (Hybrid Control System - Diagnostic Codes (4 Of 5)) >> Hybrid Control System >> DTC P1C86-79: Transmission (Input) Mechanical Linkage Failure [11/2023 - ] >> Procedure

DTC P1C86-79: Transmission (Input) Mechanical Linkage Failure [11/2023 - ]: Procedure

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  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P1C86-79 only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs including pending DTCs are also output. B
      Malfunction Content Relevant DTC
      Sensor and actuator circuit malfunction P1C87-79 Generator Mechanical Linkage Failure
      P1C88-79 Planetary Gear Mechanical Linkage Failure

      HINT: 

      P1C86-79 may be output as a result of the malfunction indicated by the DTCs above.

    2. Turn the ignition switch off.

    Result: 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

    Result: 

    See step  2

  2. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION) 

    See step  1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  3

  3. CLEAR DTC 

    See step  2

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK ENGINE RACING 

    See step  3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK CREEP MOVEMENT 

    See step  4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  6

  6. INSPECT ENGINE SPEED 

    See step  5

    Result

    Result Proceed to
    The absolute value of the difference is less than 500 rpm. A
    The absolute value of the difference is 500 rpm or more continuously for 1 second. B

    Result: 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  7. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) 

    See step  6

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE ENGINE