LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2021 >> Crosstrek Sport >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (P-HEV Hybrid Powertrain Control System (Diagnostics) (3 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P1C86-79: Transmission (Input) Mechanical Linkage Failure >> Notes

DTC P1C86-79: Transmission (Input) Mechanical Linkage Failure: Notes

WARNING: This page is about a different variant/trim than selected.
  1. - 

    Outline of diagnosis: 

    Transaxle system fault (input system lock)

    Engine cranking was commanded while the vehicle was stopped; however, the generator did not rotate

    Generator or engine does not rotate, or fault of planetary gear

    (1 trip detection logic)

    Trouble symptom: 

    • Reduced output power
    • A driving range is limited
    • Engine always stopped
    CAUTION:
  1. CHECK DTC  .

    Read the DTC of [P-HEV Hybrid Powertrain Control] using the Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    NOTE:
    Malfunction contents Related DTC
    Sensor and actuator circuit malfunction P1C87-79 GENERATOR MECHANICAL LINKAGE FAILURE  
    P1C88-79 PLANETARY GEAR MECHANICAL LINKAGE FAILURE  
    NOTE: DTC P1C86-79 may be output simultaneously due to the fault that DTC above describes.

    When "Only DTC P1C86-79 is displayed" or "DTC other than above is displayed", go to  A.

    When DTCs related to [P-HEV Hybrid Powertrain Control] mentioned above are simultaneously displayed, go to  B.

    Yes: 

    1. Go to  2.
    2. Perform the diagnosis for the simultaneously displayed DTCs.
      NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.

    No: 

    -

  2. CHECK CRANK PULLEY ROTATION (P POSITION)  .
    1. Check that the shift is placed in P position.
    2. Lift up the vehicle at all wheels.
    3. Rotate the crank pulley clockwise by hand and check if the crank shaft rotates.
      CAUTION: Turn to READY ON during inspection. Be sure to check for IG OFF before inspection to prevent the engine from starting.
      NOTE: It is occasionally difficult to rotate the crank pulley due to resistance with compression in the engine. Therefore check whether or not the rotation can be done (locked/unlocked) by applying appropriate torque by hand (a torque that can rotate the crank pulley in normal engine condition of the same type).

      Does the crank pulley rotate?

    Yes: 

    Go to  3.

    No: 

    Go to  6.

  3. CHECK ENGINE RACING  .
    1. Using the Subaru Select Monitor, read and record the following DTCs and freeze frame data. Ref. to ENGINE (DIAGNOSTICS) (H4DO(HEV))>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to ENGINE (DIAGNOSTICS) (H4DO(HEV))>FREEZE FRAME DATA . Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>FREEZE FRAME DATA .
      • Engine
      • P-HEV Hybrid Powertrain Control
    2. Using the Subaru Select Monitor, perform the following clear memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .
      • Engine
      • P-HEV Hybrid Powertrain Control
    3. Check that the shift is placed in P position.
    4. Set the vehicle to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION> SERVICE MODE .
    5. Turn to READY ON.
    6. Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • Engine Speed
      • Generator Revolution
    7. With the READY light illuminating, depress the accelerator pedal for 10 seconds.
    8. Check the revolution speed.
    NOTE:
    • Reference value
      Item Engine speed Generator revolution speed
      Condition Approx. 1000 rpm Approx. 3400 rpm
      Approx. 1500 rpm Approx. 5100 rpm
      Approx. 2000 rpm Approx. 6800 rpm
    • Alignment chart
      G13942364Courtesy of SUBARU OF AMERICA, INC.

    Does [Generator Revolution] become approximately 3.4 times of [Engine Speed]? (See the reference values and alignment chart above)

    NOTE: When the engine is not racing and DTC P3147-79 ([Transmission (Shaft) Mechanical Linkage Failure]) is displayed as a result of reading DTC using the Subaru Select Monitor, or when the generator turns but the engine cranking does not occur, replace Transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>TRANSMISSION ASSEMBLY .

    Yes: 

    Go to  4.

    No: 

    Replace Transmission assembly and Damper(with torque limiter). Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>TRANSMISSION ASSEMBLY . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

  4. CHECK CREEP RUNNING  .
    1. Turn to READY ON.
    2. Depress the brake pedal and shift to D position. Then, release the brake pedal.
    3. Check the tires for smooth rotation (check whether creep running is possible).

    Do the tires rotate? (Is creep running possible?)

    Yes: 

    Go to  5.

    No: 

    Replace Transmission assembly and Damper(with torque limiter). Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>TRANSMISSION ASSEMBLY . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

  5. CHECK ENGINE SPEED AT ACCELERATION  .
    1. Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • Engine Speed
      • Generator Revolution
      • Motor Revolution
    2. Shift to D position.
    3. Fully accelerate from the vehicle speed at 10 km/h (6.2 MPH) or more.
      CAUTION: Check the safety around the vehicle and perform the test.
    4. Check the revolution speed.

    Does the difference (absolute value) of 500 r/min or more between "[Engine Speed]" and "0.29 x [Generator Revolution] + 0.17 x [Motor Revolution]" continue for one second or more?

    Yes: 

    Replace Transmission assembly and Damper(with torque limiter). Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>TRANSMISSION ASSEMBLY . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

    No: 

    Replace Damper(with torque limiter). Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

  6. CHECK CRANK PULLEY ROTATION (N POSITION)  .
    1. Lift up the vehicle at all wheels.
    2. Depress the brake pedal and shift the select lever to N position.
    3. Rotate the crank pulley clockwise by hand and check if the crank shaft rotates.
      CAUTION: Turn to READY ON during inspection. Be sure to check for IG OFF before inspection to prevent the engine from starting.
      NOTE: It is occasionally difficult to rotate the crank pulley due to resistance with compression in the engine. Therefore check whether or not the rotation can be done (locked/unlocked) by applying appropriate torque by hand (a torque that can rotate the crank pulley in normal engine condition of the same type).

      Does the crank pulley rotate?

    Yes: 

    Replace Transmission assembly and Damper(with torque limiter). Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>TRANSMISSION ASSEMBLY . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

    No: 

    Replace Damper(with torque limiter), and repair or replace the engine. Ref. to SPECIFICATION . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL .

scientia non olet · About LEMON Manuals