Hybrid Control (Diagnostic Codes (P0A78-284 - P0AA4-232): Overview Lexus HS I

DESCRIPTION

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the motor inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the motor inverter fail signal line.

MONITOR DESCRIPTION

If the motor inverter overheats, it will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the motor inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the motor inverter fail signal line.

If the motor inverter detects a circuit malfunction, it will transmit a motor inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the motor inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the motor inverter fail signal line.

If excessive amperage flows through the motor inverter due to an internal short, the motor inverter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the MG2 torque execution value does not correspond to the torque command value from the MG ECU to MG2, the hybrid vehicle control ECU will store this DTC.

If the difference between the requested MG2 torque and the actual MG2 torque exceeds a predetermined value, the MG ECU determines that there is a malfunction in the execution or monitoring of MG2 torque. Then, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If an overvoltage occurs in the motor inverter or generator inverter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the motor inverter detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If an overvoltage occurs in the motor inverter or generator inverter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the motor inverter detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

If excessive amperage flows through the motor inverter due to an internal short, the motor inverter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the inverter receives a motor gate shutdown signal from the MG ECU, it will turn all power transistors off which are activating MG2 to forcibly stop MG2 operation.

The MG ECU monitors motor gate shutdown signals and detects a malfunction.

HINT

1. When P0A78-510 has been stored, the hybrid system cannot be restarted until the DTC is cleared.
2. If the problem symptom cannot be reproduced, leaving the vehicle with the power switch on (READY) and neutral (N) selected for 1 minute will make it easier to reproduce the symptom.

The MG ECU monitors the current to MG2. If current passes to MG2 while the vehicle is stopped with the power switch on (IG) or neutral (N) selected, the MG ECU will detects an abnormality. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

Refer to the description for DTC P0A78-266. Refer to DESCRIPTION

The signal line from the inverter voltage (VH) sensor is connected to the MG ECU inside the inverter with converter assembly. If P0A78-586 is output, replace the inverter with converter assembly.

The hybrid vehicle control ECU monitors the inverter voltage (VH) sensor signal. If the hybrid vehicle control ECU detects a fault in the sensor signal, the hybrid vehicle control ECU interprets this as a VH sensor failure. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold for a specified period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold for a specified period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the generator inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the generator inverter fail signal line.

If excessive amperage flows through the generator inverter due to an internal short, the generator inverter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If an abnormal amount of current flows through the generator inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

If the MG ECU detects that the generator inverter current exceeds the threshold level for a specified period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the generator inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the generator inverter fail signal line.

If the generator inverter overheats, it will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the generator inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the generator inverter fail signal line.

If the generator inverter detects a circuit malfunction, it will transmit a generator inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the generator inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the generator inverter fail signal line.

If excessive amperage flows through the generator inverter due to an internal short, the generator inverter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the MG1 torque execution value does not correspond to the torque command value from the MG ECU to MG1, the hybrid vehicle control ECU will store this DTC.

If the difference between the requested MG1 torque and the actual MG1 torque exceeds a predetermined value, the MG ECU determines that there is a malfunction in the execution or monitoring of MG1 torque. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If the generator inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the generator inverter fail signal line.

If excessive amperage flows through the generator inverter due to an internal short, the generator inverter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If the inverter receives a generator gate shutdown signal from the MG ECU, it will turn all power transistors off which are activating MG1 to forcibly stop MG1 operation.

The MG ECU monitors generator gate shutdown signals and detects a malfunction.

HINT

1. If DTC P0A7A-522 is output, the hybrid system cannot be restarted until the DTC is cleared.
2. If the malfunction is not reproduced, leave the vehicle for 1 minute with neutral (N) selected in order to easily reproduce the malfunction.

The MG ECU monitors the current to the MG1. The MG ECU checks if current passes to the MG1 while the vehicle is stopped with the power switch on (IG) or neutral (N) selected. If current flow is detected in either of these two situations, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance .

If an abnormal amount of current flows through the generator inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

If the MG ECU detects that the generator inverter current exceeds the threshold level for a specified period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If an abnormal amount of current flows through the generator inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.

If the MG ECU detects that the generator inverter current exceeds the threshold level for a specified period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field in accordance with the rotating position and speed of the rotor. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Furthermore, the system properly controls the rotating magnetic field and the angle of the rotor magnets in order to generate high torque in an efficient manner, even at high speeds.

Scheme 526

The MG ECU monitors MG2. If the MG ECU detects a reduction in the magnetic force of MG2 or an inphase short, it interprets this as an MG2 failure. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of MG2. Refer to DESCRIPTION .

The MG ECU monitors MG2. If the MG ECU detects a malfunction of MG2, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of MG1. Refer to DESCRIPTION .

The MG ECU monitors MG1. If the MG ECU detects a reduction in the magnetic force of MG1 or an inphase short, it interprets this as an MG1 failure. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of MG1. Refer to DESCRIPTION .

The MG ECU monitors MG1. If the MG ECU detects a malfunction of MG1, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

The inverter converts the high-voltage direct current of the HV battery into the alternating current for MG1 and MG2. The inverter generates heat during the conversion process. Therefore, the inverter is cooled by a special cooling system consisting of an electric water pump, the cooling fan, and a radiator. This cooling system is independent of the engine cooling system. The hybrid vehicle control ECU monitors the electric water pump, cooling fan, and inverter cooling system, and detects the following malfunctions.

Scheme 527

TEXT IN ILLUSTRATION

If the hybrid vehicle control ECU detects a malfunction of the electric water pump, cooling fan or HV cooling system, the ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter (inverter with converter assembly) detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If excessive amperage flows through the boost converter due to an internal short, the boost converter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

The boost converter boosts the 244.8 V DC from the HV battery to a maximum of approximately 650 V DC. The inverter converts the voltage that has been boosted by the boost converter into alternating current, which is used for driving MG1 and MG2. When a motor generator operates as a generator, the alternating current that it creates is converted into direct current by the inverter. Then the boost converter drops this voltage to direct-current of approximately 244.8 V in order to charge the HV battery.

Scheme 528

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. It also uses a voltage sensor (VH) that is built into the inverter to detect the high voltage after it is boosted. Based on the voltage before and after it is boosted, the MG ECU controls the operation of the boost converter to boost the voltage to the target voltage.

If the difference between the requested boost converter voltage and the actual boost converter voltage exceeds a predetermined value, the MG ECU determines that there is a malfunction of the execution or monitoring in the boost converter voltage. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DESCRIPTION .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter (inverter with converter assembly) detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DESCRIPTION .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter (inverter with converter assembly) detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter (inverter with converter assembly) detects overvoltage, it will transmit an overvoltage signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter detects a circuit malfunction, it will transmit a boost converter overvoltage signal to the MG ECU. Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter overheats, it will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DESCRIPTION .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If excessive amperage flows through the boost converter due to an internal short, the boost converter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DESCRIPTION .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If excessive amperage flows through the boost converter due to an internal short, the boost converter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If excessive amperage flows through the boost converter due to an internal short, the boost converter will transmit an inverter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description of the boost converter. Refer to DTC P0A94-442: DC / DC Converter Performance .

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

If the boost converter detects a circuit malfunction, it will transmit a boost converter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

Refer to the description for DTC P0A94-589. Refer to DESCRIPTION .

The hybrid vehicle control ECU monitors the boost converter voltage sensor signal. If the hybrid vehicle control ECU detects an abnormality in the sensor signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

For a description for the boost converter. Refer to DESCRIPTION .

The MG ECU uses a voltage sensor that is built into the boost converter to detect the high voltage (VL) before it is boosted. The hybrid vehicle control ECU also uses the battery smart unit to detect HV battery voltage (VB).

HINT

Using the Techstream, check the Data List of HV battery voltage and current. If these values are not within the below range, there is a battery smart unit malfunction.

Scheme 529

The hybrid vehicle control ECU monitors the signals of the HV battery voltage (VB) and boost converter voltage (VL) sensors. When a large difference occurs between the voltages from the VB and VL sensors, the hybrid vehicle control ECU interprets this as a failure of either of the sensors. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

The MG ECU uses a voltage sensor that is built into the boost converter to detect pre-boost high voltage (VL) to allow boost control. The boost converter voltage sensor outputs a voltage that varies between 0 and 5 V in accordance with changes in pre-boost voltage (VL). The higher the pre-boost voltage, the higher the sensor output voltage. Conversely, the lower the pre-boost voltage, the lower the output voltage. The MG ECU monitors the boost converter voltage sensor signal line and detects a malfunction.

Scheme 530

The MG ECU monitors the boost converter voltage (VL) sensor circuit. If the MG ECU detects an open or short circuit malfunction of the VL sensor circuit, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

1. Refer to the description for DTC P0AE6-225. Refer to «DESCRIPTION»(ref-398092-S39966778402011051600000) .
2. This circuit uses the hybrid vehicle control ECU to monitor the system main relays and stops the system if a malfunction is detected in the relays, because it may be impossible to shut off the high-voltage system if any of the relays becomes stuck.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .