DTC P1C77-79: Engine Failed to Start Mechanical Linkage Failure [11/2021 - 10/2023]: Description
The hybrid vehicle transmission assembly consists of the planetary gear unit, generator (MG1) and motor (MG2). The planetary gear unit uses a planetary gear to split the engine output into mechanical power and electrical power in accordance with driving requests when the vehicle is being driven or the HV battery is being charged. When accelerating, motor (MG2) assists engine output by increasing vehicle driving force. Motor (MG2) also converts braking energy, which would otherwise be consumed in the form of heat during braking, into electrical energy. This recovered energy is stored in the HV battery. Generator (MG1) supplies power, which is used for charging the HV battery or driving motor (MG2), and also regulates the amount of electricity being generated. In addition, generator (MG1) is used as a starter motor to start the engine.
If the hybrid vehicle control ECU assembly detects that the engine or transmission gear has seized, the hybrid vehicle control ECU assembly will perform fail-safe control. Also, if a substance or object is preventing the engine or transmission internal components from rotating, the hybrid vehicle control ECU assembly will perform fail-safe control.
| *1 | Generator (MG1) | *2 | Input Shaft |
| *3 | Front Planetary Sun Gear | *4 | Motor (MG2) |
| *5 | Center Planetary Sun Gear | *6 | Center Planetary Ring Gear |
| *7 | Rear Planetary Carrier | *8 | Rear Planetary Ring Gear |
| *9 | Output Shaft | *10 | Rear Planetary Sun Gear |
| *11 | Center Planetary Carrier | *12 | Front Planetary Ring Gear |
| *13 | Front Planetary Carrier | - | - |
| *a | Drive Force Distribution Mechanism | *b | Gear Shift Mechanism |
| *c | Transmission Input Damper (Engine Output) |
*d | to Propeller Shaft |
| C1 | No. 1 Clutch | C2 | No. 2 Clutch |
| B1 | No. 1 Brake | B2 | No. 2 Brake |
| F1 | One-way Clutch | - | - |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P1C77-79 | Engine Failed to Start Mechanical Linkage Failure | The engine does not start even though it is being cranked (transmission input circuit malfunction (engine system)) (1 trip detection logic) |
|
Does not come on | Master Warning: Comes on |
| DTC No. | Data List |
|---|---|
| P1C77-79 |
|