Hybrid Control System (Diagnostic Codes (P0A3F-243 - P0A7A-324)): Overview Lexus CT I

DESCRIPTION

A resolver is a sensor that is used to detect the position of the magnetic poles the rotor of a motor generator. Knowing the position of the poles is indispensable for ensuring precise control of MG2 and MG1.

Each resolver contains a stator that has an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor turns because the rotor is oval shaped. An alternating current with a predetermined frequency flows through the excitation coil, and detection coils S and C output alternating currents in accordance with the sensor rotor position.

The inverter with converter assembly (MG ECU) detects the absolute position of the rotor according to the phases of detection coils S and C and the heights of their waveforms. Furthermore, the CPU calculates the amount of change in the position within a predetermined length of time, in order to use the resolver as a speed sensor.

The MG ECU monitors signals output from the motor resolver and detects malfunctions.

HINT

The term "drive motor A" indicates MG2.

Scheme 463

MONITOR DESCRIPTION

The MG ECU monitors the motor resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction in the motor resolver. If a malfunction is detected, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

A resolver is a sensor that is used to detect the position of the magnetic poles the rotor of a motor generator. Knowing the position of the poles is indispensable for ensuring precise control of MG2 and MG1.

Each resolver contains a stator that has an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor turns because the rotor is oval shaped. An alternating current with a predetermined frequency flows through the excitation coil, and detection coils S and C output alternating currents in accordance with the sensor rotor position.

The inverter with converter assembly (MG ECU) detects the absolute position of the rotor according to the phases of detection coils S and C and the heights of their waveforms. Furthermore, the CPU calculates the amount of change in the position within a predetermined length of time, in order to use the resolver as a speed sensor.

The MG ECU monitors signals output from the motor resolver and detects malfunctions.

The MG ECU monitors the generator resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction of the generator resolver. If a malfunction is detected, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

The MG ECU located in the inverter with converter assembly monitors its internal operation and it will set DTCs when it detects malfunctions.

The MG ECU located in the inverter with converter assembly monitors the motor inverter current sensors. P0A60 and P0A63 indicate malfunctions in current sensors, and they do not indicate malfunctions in the high-voltage system.

HINT

The term "drive motor A" indicates MG2.

The power management control ECU (HV CPU) monitors the motor inverter current sensor. If the power management control ECU (HV CPU) detects a fault, it will illuminate the MIL and set a DTC.

The MG ECU located in the inverter with converter assembly monitors the generator inverter current sensors. P0A72 and P0A75 indicate malfunctions in the current sensors, and they do not indicate malfunctions in the high-voltage system.

The power management control ECU (HV CPU) monitors the generator inverter current sensor. If the power management control ECU (HV CPU) detects a fault, it will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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. Upon receiving this signal, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects over-voltage, it will transmit an over-voltage signal to the MG ECU. Upon receiving this signal, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU) 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 power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold for a specified period of time, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

The inverter contains a three-phase bridge circuit, which consists of six power transistors (IGBTs) each for MG1 and MG2. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG1 and MG2; it also converts three-phase alternating current supplied by MG1 and MG2 into direct current for the HV battery. The MG ECU controls the actuation of the power transistors (IGBTs). The inverter transmits information necessary for control, such as amperage and voltage, to the MG ECU.

Scheme 464

The MG ECU uses an inverter voltage sensor, which is built into the inverter, to detect boosted high voltage to allow control of the voltage boost.

The MG ECU monitors the inverter voltage sensor and detects the following malfunctions.

The MG ECU monitors the inverter voltage (VH) sensor circuit. If the MG ECU detects an open or short in the VH sensor circuit, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects overvoltage, it will transmit an overvoltage signal to the MG ECU. Upon receiving this signal, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects a circuit malfunction, it will transmit a motor inverter overvoltage signal to the MG ECU. Upon receiving this signal, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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 overheats, it will transmit an inverter fail signal to the MG ECU. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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 an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the power management control ECU (HV CPU) of the malfunction.

P0A78 (INF 287)

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. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

P0A78 (INF 807)

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold level for a specified period of time, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

If the MG2 torque execution value does not correspond to the torque command value from the MG ECU to MG2, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects overvoltage, it will transmit an overvoltage signal to the MG ECU. Upon receiving this information, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects overvoltage, it will transmit an overvoltage signal to the MG ECU. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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 an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the power management control ECU (HV CPU) of the malfunction.

P0A78 (INF 505)

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. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

P0A78 (INF 806)

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold level for a specified period of time, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

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 an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the power management control ECU (HV CPU) of the malfunction.

P0A78 (INF 506)

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. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

P0A78 (INF808)

The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold level for a specified period of time, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU).

If the motor inverter detects a circuit malfunction, it will transmit a motor inverter overvoltage signal to the MG ECU. Upon receiving this signal, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU) monitors the inverter voltage (VH) sensor signal. If the power management control ECU (HV CPU) detects a fault in the sensor signal, the power management control ECU (HV CPU) interprets this as a VH sensor failure. The power management control ECU (HV CPU) 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. Upon receiving this signal, the power management control ECU (HV CPU) 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 power management control ECU (HV CPU) of the malfunction.

If the MG ECU detects that the generator inverter current exceeds the threshold level for a period of time, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

For a description of the inverter. Refer to DESCRIPTION .

The MG ECU monitors the generator inverter electric current. If the current exceeds the threshold for a specified period of time, the power management control ECU (HV CPU) 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 the generator inverter overheats, it will transmit an inverter fail signal to the MG ECU. Upon receiving this information, the power management control ECU (HV CPU) 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 the generator inverter detects a circuit malfunction, it will transmit a generator inverter fail signal to the MG ECU. Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

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