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MOTOR GENERATOR CONTROL SYSTEM, Diagnostic DTC:P1C641F, P1CAC49, P1CAF38

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DTC Code DTC Name
P1C641F Generator Control Module Circuit Intermittent
P1CAC49 Generator Position Sensor Internal Electronic Failure
P1CAF38 Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect
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DESCRIPTION

The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and detects malfunctions.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P1C641F Generator Control Module Circuit Intermittent

Excitation signal (REF signal) for resolver angle detection cycle malfunction detected when DTC P0C7917, P0D3319, P1C5D19 or P1C5F19 is stored.

(1 trip detection logic)

  • Inverter with converter assembly

  • Hybrid vehicle transmission assembly

  • Wire harness or connector

 Does not come on

Master Warning Light:

Does not come on
P1CAC49 Generator Position Sensor Internal Electronic Failure

Generator resolver angle malfunction:

The difference between the resolver angle for control and estimated resolver angle exceeds the allowable limit.

(1 trip detection logic)

  • Inverter with converter assembly

  • Hybrid vehicle transmission assembly

  • Wire harness or connector

 Comes on

Master Warning Light:

Comes on
P1CAF38 Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect

Resolver REF signal cycle malfunction:

Excitation signal (REF signal) for resolver angle detection cycle malfunction

(1 trip detection logic)

  • Inverter with converter assembly

  • Hybrid vehicle transmission assembly

  • Wire harness or connector

 Comes on

Master Warning Light:

Comes on
Table 1. Related Data List
DTC No. Data List
P1CAC49 Generator Revolution
P1CAF38
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CONFIRMATION DRIVING PATTERN

Tip:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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  1. Connect the GTS to the DLC3.

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

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

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. With power switch on (IG) and wait for 5 seconds or more.*

    *: Lightly wiggle the connectors and wire harnesses up and down and right and left.

  7. Turn the power switch on (READY) with park (P) selected and wait for 5 seconds or more.

  8. Depress the accelerator pedal of the vehicle with the engine stopped and park (P) selected to start the engine.

  9. Keep the engine running for 5 seconds or more.

  10. Select drive (D) and drive the vehicle forward for 5 m (16 ft.) or more.

  11. Select reverse (R) and drive the vehicle backward for 5 m (16 ft.) or more.

  12. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.

  13. Check the DTC judgment result.

    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE, perform driving pattern again.

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WIRING DIAGRAM

Refer to the wiring diagram for the Motor Resolver Circuit.

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Refer to the wiring diagram for the Generator Resolver Circuit.

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CAUTION / NOTICE / HINT

CAUTION:

  • B004STG

    Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the HV battery

  • B004Y5N

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.

  • B004SX1

    After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • B004W3JC06
    *a Without waiting for 10 minutes

    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.

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    Tip:

    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.

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Tip:

  • 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.

  • If the resolver is malfunctioning, the vehicle may not drive smoothly.

  • When inspecting the connectors, if it is difficult to judge if a connector was disconnected, deformed or improperly secured, disconnect and reconnect the connector and then check for DTCs again. Check if the same DTC is output. If the same DTC is not output, improper connection of connectors is suspected.

  • As a malfunction detection threshold may be exceeded when performing the vibration or heat connector inspections, make sure to perform the following inspection to check that the DTC was not stored due to the malfunction of a part.

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PROCEDURE


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    CHECK DTC OUTPUT (MOTOR GENERATOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Motor Generator / Trouble Codes.

    4. Check for DTCs.


      1. Powertrain > Motor Generator > Trouble Codes


      Result
      Result Proceed to
      P1C641F, P1CAC49 or P1CAF38 only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Relevant DTC
      P0A3F16 Drive Motor "A" Position Sensor Circuit Voltage Below Threshold
      P0A4B16 Generator Position Sensor Circuit Voltage Below Threshold
      P0C6413 Generator Position Sensor Circuit "A" Circuit Open
      P0C6416 Generator Position Sensor Circuit "A" Circuit Voltage Below Threshold
      P0C6417 Generator Position Sensor Circuit "A" Circuit Voltage Above Threshold
      P0C6913 Generator Position Sensor Circuit "B" Circuit Open
      P0C6916 Generator Position Sensor Circuit "B" Circuit Voltage Below Threshold
      P0C6917 Generator Position Sensor Circuit "B" Circuit Voltage Above Threshold

    5. Turn the power switch off.


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    CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    Result
    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C
    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. B004SKUC01
      *A for LHD *B for RHD

      Check the connection condition of the low voltage connectors of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and the connector for water and foreign matter.

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      Note:

      Before disconnecting the connector, confirm that it is properly connected by checking that the claws of the lock levers are engaged and that the connector cannot be pulled off.

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      Result
      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C
      Tip:

      When connecting the connector, connect it with the lock levers raised. Rotate each lock lever downward and make sure that the connector is securely connected. When a lock lever is fully lowered, a click will be heard as its claw engages. After the click is heard, pull up on the connector to confirm that it is securely connected.


    • AClick here
    • B

      CONNECT SECURELY

    • C

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK GENERATOR RESOLVER CIRCUIT

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    Result
    Proceed to
    NEXT

  4. Click here

    CHECK MOTOR RESOLVER CIRCUIT

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    Tip:

    If the "Motor Resolver Circuit" inspection results are normal, perform the next step.

    Result
    Proceed to
    NEXT

    • NEXT

      REPLACE INVERTER WITH CONVERTER ASSEMBLYClick here