HYBRID CONTROL SYSTEM, Diagnostic DTC:P1C8679

DTC Code DTC Name
P1C8679 Transmission (Input) Mechanical Linkage Failure

DTC SUMMARY

Refer to the DTC summary for DTC P1C7779.

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DESCRIPTION

Refer to the description for DTC P1C7779.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P1C8679 Transmission (Input) Mechanical Linkage Failure

Hybrid vehicle transaxle malfunction (input system lock):

When the vehicle is stopped, an engine cranking signal is sent but the generator (MG1) does not rotate.

The generator (MG1) or the engine does not rotate, or the planetary gear unit is malfunctioning.

(1 trip detection logic)

  • Hybrid vehicle transaxle assembly

  • Transmission input damper assembly

  • One-way clutch assembly

  • Engine

 Does not come on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P1C8679

  • Generator Revolution

  • Motor Revolution

  • Engine Speed

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. Put the engine in maintenance mode.

  7. With the vehicle stopped and the park (P) selected, turn the power switch on (READY) to start the engine.

  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  9. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

CAUTION / NOTICE / HINT

Tech Tips

If this DTC is output, the engine or hybrid transaxle assembly may have seized. Before performing this inspection, check the engine oil, hybrid transaxle fluid, coolant (for Engine) and coolant (for Inverter) levels.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P1C8679 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 P1C8779 Generator Mechanical Linkage Failure
      P1C8879 Planetary Gear Mechanical Linkage Failure

      Tech Tips

      P1C8679 may be output as a result of the malfunction indicated by the DTCs above.

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

  2. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

    Result
    Proceed to
    OK
    NG

    1. Check that park (P) is selected.

    2. Lift the vehicle.

    3. Manually turn the crankshaft pulley clockwise to check if the crankshaft rotates smoothly.

      CAUTION:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power 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

    NG

    CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION) Click here

    OK

  3. CLEAR DTC

    Result
    Proceed to
    NEXT

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Trouble Codes

    5. Enter the following menus: Powertrain / Engine / Trouble Codes.

    6. Read and record the DTCs and freeze frame data.


      Powertrain > Engine > Trouble Codes

    7. Clear the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Clear DTCs
      Powertrain > Engine > Clear DTCs

    8. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK ENGINE RACING

    Result
    Proceed to
    OK
    NG

    1. Check that park (P) is selected.

    2. Connect the GTS to the DLC3.

    3. Put the engine in maintenance mode.

    4. Turn the power switch on (READY).

    5. Enter the following menus: Powertrain / Motor Generator Control / Data List / Generator Revolution, Engine Speed.

    6. Read the Data List.


      Powertrain > Motor Generator > Data List
      Tester Display
      Engine Speed
      Generator Revolution
    7. A003N1IC02
      *a Generator (MG1)
      *b Engine
      *c Motor (MG2)
      *d Malfunction
      *e Normal

      While the READY indicator is on, depress the accelerator pedal for 10 seconds.

      OK
      "MG1 Motor Revolution" is approximately 3.6 times "Engine Speed".

      Tech Tips


      • If the engine does not race and DTC P314779 (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 MG1 Motor Revolution
      Reference Value Approximately 1000 rpm Approximately 3600 rpm
      Approximately 1500 rpm Approximately 5400 rpm
      Approximately 2500 rpm Approximately 9000 rpm

    8. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here
    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here

    OK

  5. CHECK CREEP MOVEMENT

    Result
    Proceed to
    OK
    NG

    1. Turn the power switch 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 power switch off.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here
    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here

    OK

  6. INSPECT ENGINE SPEED

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Enter the following menus: Powertrain / Motor Generator Control / Data List / Engine Speed, Motor Revolution, Generator Revolution.

    4. Read the Data List.


      Powertrain > Motor Generator > Data List
      Tester Display
      Engine Speed
      Motor Revolution
      Generator Revolution

    5. Move the shift lever to D.

    6. 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.

      OK
      The difference between "Engine Speed" and "0.28 X Generator Revolution + 0.19 X Motor Revolution" is below 500 rpm and it is maintained for 1 second.

      Tech Tips

      If the transaxle gear is normal, the following formula is true.

      Engine Speed = 0.28 X Generator Revolution + 0.19 X Motor Revolution

    7. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here
    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here

    NG

    REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here

  7. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

    Result
    Proceed to
    OK
    NG

    1. Lift the vehicle.

    2. Depress the brake pedal and move the shift lever to select neutral (N).

    3. Manually turn the crankshaft pulley clockwise to check if the crankshaft rotates smoothly.

      CAUTION:

      Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power 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

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here
    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY AND ONE-WAY CLUTCH ASSEMBLY Click here

    NG

    REPLACE ONE-WAY CLUTCH ASSEMBLY AND REPAIR OR REPLACE ENGINE Click here