Hybrid Control System: Fail-Safe

WARNING: This page is about a different car, the 2015 Infiniti Q70. However, it is still accessible from the selected car via links, so may be relevant.

If a malfunction occurs in the hybrid system, HPCM performs fail-safe activation according to the detected malfunction, and activates the hybrid system warning lamp or 12-volt battery charge warning lamp.

DTC	Detection items	Hybrid system operation and vehicle behavior
U0100 P0510 P314D P314E P31A6	Engine	If engine fuel is cut off or ECM CAN communication are abnormal	The engine is stopped and the vehicle is driven by the traction motor alone.
		If ECM stopped control of the electric throttle control actuator	The drive force is controlled to a creep force, regardless of the amount the accelerator pedal is depressed.
		If ECM is limiting speed due to fuel cut-off	Engine stop control is prohibited and the vehicle is driven by the engine alone with a limit on the engine speed. For this reason, acceleration performance decreases.
P2857 P2859	Clutch 1	If there is a malfunction on the clutch 1 engaged side	Engine stop control is prohibited.
P2857 P2859	Clutch 1	If there is a malfunction on the clutch 1 disengaged side	The engine is stopped and the vehicle is driven by the traction motor alone.
U0110 P0A1D P3176 P3177 P317A P317B P31A7	Traction motor inverter	If the CAN communication with the traction motor inverter computing unit or traction motor inverter are abnormal	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
U0110 P0A1D P3176 P3177 P317A P317B P31A7	Traction motor inverter	If the traction motor inverter stopped control of the traction motor	Engine stop control is prohibited, and the vehicle is driven by the engine alone. As a result, acceleration performance decreases and the shifting shock becomes larger.
U0101 P3185 P31A8	Transmission	Transmission malfunction (If clutch 2 is unable to slip)	The engine is stopped and the vehicle is driven by the traction motor alone.
		Transmission malfunction (If clutch 2 is able to slip)	Driving occurs according to the restrictions on transmission gears.
		If CAN communication with the TCM computing unit or TCM are abnormal	The engine and traction motor are stopped. Driving is not possible even when the accelerator pedal is depressed.
P3149	Sub electric oil pump	Engine stop control is prohibited in low vehicle-speed ranges. If the engine is stopped, driving becomes impossible, and the "Shift P Warning" is displayed on the information display. When the warning instructions are followed and the driver shifts to the P position, the engine starts and driving becomes possible again.
P3123 P3124 P3125 P3126 P3127 P3128	Electric water pump	Controlling the motor torque and drive with the engine power only, therefore the acceleration becomes slower, also the shift shock becomes more obvious.
U0111 P0A1F P317F P3181 P3182 P31A9	Li-ion battery	If there is a Li-ion battery malfunction, or if CAN communication with the Li-ion battery controller computing unit and Li-ion battery controller are abnormal	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
U0111 P0A1F P317F P3181 P3182 P31A9	Li-ion battery	If the Li-ion battery power usage is restricted by the Li-ion battery controller	Engine stop control is prohibited, and the vehicle is driven by the engine alone. As a result, acceleration performance decreases and the shifting shock becomes larger.
P0AA6 P3117 P3118 P3119 P3120	High-voltage system insulation resistance	Hybrid system start is prohibited. Vehicle does not change to READY state even if the start operation is performed.
P0A95 P311D P311E	High-voltage power wiring	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P0AA0 P0AA1 P0AA4	System main relay	Hybrid system start is prohibited. Vehicle does not change to READY state even if the start operation is performed.
P0ADB P0ADC	System main relay	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P0B37	Service plug	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P0A0A	Interlock switch	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P0A08 P0A12	DC/DC converter	Vehicle speed is limited according to the drop in 12V battery voltage. After vehicle speed gradually decreases and only creep drive force is output, drive force output stops.
P0AE2 P0AE6 P0AE7 P311F	Pre-charge relay	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P0A1D P3146	HPCM	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
U1000	CAN Communication	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P3157	Sensor power supply	The hybrid system is stopped. Driving is not possible even when the accelerator pedal is depressed.
P2122 P2123 P2127 P2128 P2138	Accelerator pedal position sensor	Engine stop control is prohibited, and the drive force is controlled to a creep force, regardless of the amount the accelerator pedal is depressed. If the malfunction is detected during motor driving, motor driving continues. When the driver next shifts to the P position, the engine starts and engine stop control is prohibited.
P0A0F P3150	Engine start control	Hybrid system start is prohibited. Vehicle does not change to READY state even if the start operation is performed.