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

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

Courtesy of SUBARU OF AMERICA, INC.

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	P1C8779	GENERATOR MECHANICAL LINKAGE FAILURE
   	P1C8879	PLANETARY GEAR MECHANICAL LINKAGE FAILURE

   DTC P1C8679 may be output simultaneously due to the fault that DTC above describes  .

   When "Only DTC P1C8679 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

   Courtesy 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 P314779 ([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 .