HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A4B-253, P0A4C-513, P0A4D-255

DTC Code DTC Name
P0A4B-253 Generator Position Sensor Circuit
P0A4C-513 Generator Position Sensor Circuit Range / Performance
P0A4D-255 Generator Position Sensor Circuit Low

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 MG ECU located in the inverter with converter assembly 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.

A011X6PE01
DTC No. INF Code DTC Detection Condition Trouble Area
P0A4B 253 Interphase short in the generator resolver circuit

  • Inverter with converter assembly

  • Hybrid vehicle transaxle assembly

  • Wire harness or connector
P0A4C 513 Generator resolver output is out of the normal range
P0A4D 255 Open or short in the generator resolver circuit

MONITOR DESCRIPTION

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 will illuminate the MIL and set a DTC.

MONITOR STRATEGY

Related DTCs

P0A4B (INF 253): Short circuit between phases

P0A4C (INF 513): Range check

P0A4D (INF 255): Circuit discontinuity / short circuit
Required sensors / components Generator resolver
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present TMC's intellectual property
Other conditions belong to TMC's intellectual property -

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property -

COMPONENT OPERATING RANGE

Generator resolver

DTC P0A4B (INF 253) is not detected

DTC P0A4C (INF 513) is not detected

DTC P0A4D (INF 255) is not detected

CONFIRMATION DRIVING PATTERN

A011YEDE05

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off.

  5. Turn the power switch on (READY) and turn the Techstream on.

  6. Slowly accelerate from a stop 0 km/h (0 mph) to 40 km/h (25 mph) several times while using different acceleration patterns.

    Tech Tips

    • P0A4B (INF 253):

      The vehicle should be driven with an accelerator opening of approximately 50%.

    • P0A4C (INF 513), P0A4D (INF 255):

      The vehicle should be driven with an accelerator opening of approximately 30%.

  7. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

  8. Check that permanent DTCs are cleared.

  9. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

Tech Tips

  • If a permanent DTC is output, the system is malfunctioning.

  • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A1A-200 Click here.

INSPECTION PROCEDURE

CAUTION:

  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.

    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • If INF code 253 is output, there may be an interphase short in the generator resolver due to an intrusion of water into the resolver. If the problem symptom cannot be reproduced, replace the hybrid vehicle transaxle assembly.

  • Check for output DTCs again after the repair has been completed. If P0A78-286 or P0A7A-324 is output, replace the inverter with converter assembly.

Tech Tips

If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.

PROCEDURE

  1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Check the connector connections and contact pressure of the low voltage connectors of the inverter with converter assembly Click here.

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

      A011XKAE01
      OK
      The connectors are connected securely and there are no contact pressure problems.

      Tech Tips

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

    NG

    CONNECT SECURELY

    OK

  2. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

    4. Turn the power switch on (IG).

    5. Measure the voltage according to the value(s) in the table below.

      A011Y0SE01
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E1-1 (GRF) - Body ground Power switch on (IG) Below 1 V
      E1-7 (GRFG) - Body ground Power switch on (IG) Below 1 V
      E1-2 (GSN) - Body ground Power switch on (IG) Below 1 V
      E1-8 (GSNG) - Body ground Power switch on (IG) Below 1 V
      E1-3 (GCS) - Body ground Power switch on (IG) Below 1 V
      E1-9 (GCSG) - Body ground Power switch on (IG) Below 1 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      Note

      Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    6. Turn the power switch off.

    7. Disconnect the cable from the negative (-) auxiliary battery terminal.

    8. Connect the inverter with converter assembly connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK GENERATOR RESOLVER

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Measure the resistance according to the value(s) in the table below.

      A011Y0SE01
      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      E1-1 (GRF) - E1-7 (GRFG) Power switch off 4.2 to 12.5 Ω
      E1-2 (GSN) - E1-8 (GSNG) Power switch off 9.8 to 20.1 Ω
      E1-3 (GCS) - E1-9 (GCSG) Power switch off 9.8 to 20.1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      E1-1 (GRF) or E1-7 (GRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-2 (GSN) or E1-8 (GSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-3 (GCS) or E1-9 (GCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

    4. Connect the inverter with converter assembly connector.

    NG

    Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

    4. Turn the power switch on (IG).

    5. Measure the voltage according to the value(s) in the table below.

      A011Y0SE02
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E1-4 (MRF) - Body ground Power switch on (IG) Below 1 V
      E1-11 (MRFG) - Body ground Power switch on (IG) Below 1 V
      E1-5 (MSN) - Body ground Power switch on (IG) Below 1 V
      E1-12 (MSNG) - Body ground Power switch on (IG) Below 1 V
      E1-6 (MCS) - Body ground Power switch on (IG) Below 1 V
      E1-13 (MCSG) - Body ground Power switch on (IG) Below 1 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      Note

      Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    6. Turn the power switch off.

    7. Disconnect the cable from the negative (-) auxiliary battery terminal.

    8. Connect the inverter with converter assembly connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK MOTOR RESOLVER

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Measure the resistance according to the value(s) in the table below.

      A011Y0SE02
      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      E1-4 (MRF) - E1-11 (MRFG) Power switch off 4.2 to 12.5 Ω
      E1-5 (MSN) - E1-12 (MSNG) Power switch off 9.8 to 20.1 Ω
      E1-6 (MCS) - E1-13 (MCSG) Power switch off 9.8 to 20.1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      E1-4 (MRF) or E1-11 (MRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-5 (MSN) or E1-12 (MSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-6 (MCS) or E1-13 (MCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

    4. Connect the inverter with converter assembly connector.

    NG

    Click here

    OK

  6. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)

    1. Check the connection of the generator resolver connector.

      OK
      The connector is connected securely and there are no contact problems.
      A011XKS
    NG

    CONNECT SECURELY

    OK

  7. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)

    1. Check the connection of the motor resolver connector.

      OK
      The connector is connected securely and there are no contact problems.
      A011YEZ
    NG

    CONNECT SECURELY

    OK

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

  8. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)

    1. Check the connection of the generator resolver connector.

      OK
      The connector is connected securely and there are no contact problems.
      A011XKS
    NG

    CONNECT SECURELY

    OK

  9. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Disconnect the generator resolver connector.

      A011X6QE01

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      E1-1 (GRF) - E13-1 (GRF) Power switch off Below 1 Ω
      E1-7 (GRFG) - E13-5 (GRFG) Power switch off Below 1 Ω
      E1-2 (GSN) - E13-2 (GSN) Power switch off Below 1 Ω
      E1-8 (GSNG) - E13-6 (GSNG) Power switch off Below 1 Ω
      E1-3 (GCS) - E13-3 (GCS) Power switch off Below 1 Ω
      E1-9 (GCSG) - E13-7 (GCSG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      E1-1 (GRF) or E13-1 (GRF) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-7 (GRFG) or E13-5 (GRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-2 (GSN) or E13-2 (GSN) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-8 (GSNG) or E13-6 (GSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-3 (GCS) or E13-3 (GCS) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-9 (GCSG) or E13-7 (GCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      *b

      Front view of wire harness connector

      (to Generator Resolver)

      Tech Tips

      The generator resolver is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

    5. Connect the generator resolver connector.

    6. Connect the inverter with converter assembly connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

  10. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)

    1. Check the connection of the motor resolver connector.

      OK
      The connector is connected securely and there are no contact problems.
      A011YEZ
    NG

    CONNECT SECURELY

    OK

  11. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)

    CAUTION:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect connector E1 from the inverter with converter assembly.

    3. Disconnect the motor resolver connector.

      A011VYIE01

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      E1-4 (MRF) - E12-1 (MRF) Power switch off Below 1 Ω
      E1-11 (MRFG) - E12-4 (MRFG) Power switch off Below 1 Ω
      E1-5 (MSN) - E12-2 (MSN) Power switch off Below 1 Ω
      E1-12 (MSNG) - E12-5 (MSNG) Power switch off Below 1 Ω
      E1-6 (MCS) - E12-3 (MCS) Power switch off Below 1 Ω
      E1-13 (MCSG) - E12-6 (MCSG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      E1-4 (MRF) or E12-1 (MRF) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-11 (MRFG) or E12-4 (MRFG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-5 (MSN) or E12-2 (MSN) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-12 (MSNG) or E12-5 (MSNG) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-6 (MCS) or E12-3 (MCS) - Body ground and other terminals Power switch off 10 kΩ or higher
      E1-13 (MCSG) or E12-6 (MCSG) - Body ground and other terminals Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      *b

      Front view of wire harness connector

      (to Motor Resolver)

      Tech Tips

      The motor resolver is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

    5. Connect the motor resolver connector.

    6. Connect the inverter with converter assembly connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here