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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 110 (Hybrid Control System (2WD) - Diagnostic Codes (5 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P1C77-79: Engine Failed to Start Mechanical Linkage Failure [12/2019 - 11/2023] >> Procedure

DTC P1C77-79: Engine Failed to Start Mechanical Linkage Failure [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION) 
    1. Make sure that the shift lever is in P position.
    2. Lift up the vehicle.
    3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
      WARNING:

      Do not turn the ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition switch off before performing this inspection, to prevent the engine from starting.

      NOTE:

      Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

      OK

      The crankshaft rotates smoothly.

    4. Lower the vehicle.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK ENGINE RACING 
    1. Turn the ignition switch to ON (READY).
    2. Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Engine Speed
      Generator Revolution
      1. While the READY indicator is on, depress the accelerator pedal for 10 seconds.

        OK

        "Generator Revolution" is approximately 3.6 times "Engine Speed".

        HINT: 

        • If the engine does not race and DTC P3147-79 (Transmission system) is output or generator (MG1) operates but the engine does not crank, replace the hybrid vehicle transaxle assembly.
        • Refer to the graph for Data List confirmation of "Generator Revolution" and "Engine Speed".
        Data List Engine Speed Generator Revolution
        Reference Value Approximately 1000 rpm Approximately 3600 rpm
        Approximately 1500 rpm Approximately 5400 rpm
        Approximately 2500 rpm Approximately 9000 rpm
        GTY503191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    OK 

    See step  4

  4. CHECK CREEP MOVEMENT 
    1. Turn the ignition switch to ON (READY).
    2. Depress the brake pedal, move the shift lever to D, and release the brake pedal.

      OK

      The wheels turn (the vehicle creeps forward).

    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    OK 

    See step  5

  5. INSPECT ENGINE SPEED 
    1. Turn the ignition switch to ON (READY).
    2. Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Engine Speed
      Generator Revolution
      Motor Revolution
      1. Move the shift lever to D.
      2. Fully depress the accelerator pedal when the vehicle speed is 10 km/h (6 mph) or more.
        NOTE:

        Perform this test only in an appropriate safe location, in accordance with all local laws.

      3. Calculate the difference between the value of "Engine Speed" and " (0.28 x Generator Revolution) + (0.19 x Motor Revolution)".

        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
    3. Turn the ignition switch off.

    Result: 

    A 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    B 

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

  6. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) 
    1. Lift up the vehicle.
    2. Move the shift lever to N.
    3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
      WARNING:

      Do not turn the ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition switch off before performing this inspection, to prevent the engine from starting.

      NOTE:

      Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

      OK

      The crankshaft rotates smoothly.

    4. Move the shift lever to P.
    5. Lower the vehicle.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE ENGINE 

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