DTC P1C77-79: Engine Failed to Start Mechanical Linkage Failure [11/2021 - 10/2023]: Procedure

1. Push the P position switch (shift position indicator).
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 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

Result: 

NG 

See step  6

Result: 

OK 

See step  2

1. Connect the Techstream 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

Result: 

NEXT 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (READY).
3. Enter the following menus: Powertrain / Motor Generator Control / Data List / Generator Revolution, Engine Speed.
4. Read the Data List.

   Powertrain > Motor Generator > Data List 

   Tester Display
   Engine Speed
   Generator Revolution

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

   OK

   "Generator Revolution" is approximately 3.3 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 transmission 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 3300 rpm
   	Approximately 1500 rpm	Approximately 4950 rpm
   	Approximately 2500 rpm	Approximately 8250 rpm

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

6. Turn the power switch off.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

OK 

See step  4

1. Turn the power switch on (READY).
2. Depress the brake pedal, move the shift lever to select shift state drive (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

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

OK 

See step  5

1. Connect the Techstream 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 select shift state drive (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.

   HINT: 

   If the Data List updates slowly, perform measurement after selecting only the "Engine Speed", "Generator Revolution" and "Motor Revolution" items.

   OK

   The difference between "Engine Speed" and "0.30 X Generator Revolution + 0.70 X Motor Revolution" is 500 rpm or more and it is maintained for 1 second.

7. Turn the power switch off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION INPUT DAMPER COVER ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

1. Lift up the vehicle.
2. Depress the brake pedal and move the shift lever to select neutral (N).
3. Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.
   WARNING:

   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

Result: 

OK 

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

NG 

REPAIR OR REPLACE ENGINE