HYBRID CONTROL SYSTEM, Diagnostic DTC:P279762

DTC Code DTC Name
P279762 Auxiliary Transmission Fluid Pump Signal Compare Failure

DTC SUMMARY

This indicates that a mechanical malfunction has occurred inside the hybrid transmission.

The cause of this DTC may be one of the following.


DESCRIPTION

The oil pump motor controller controls the rotation speed of the oil pump motor (three-phase brushless motor) in accordance with rotation speed request signals sent from the hybrid vehicle control ECU assembly. The controller also outputs the oil pump motor status as a signal to the hybrid vehicle control ECU assembly.

In the normal condition, the actual revolution speed of the oil pump motor corresponds to the allowable range of the rotation speed difference with respect to the required rotation speed requested from the hybrid vehicle control ECU assembly.

The line pressure generated by the oil pump with motor assembly operation is used for the gear control.

The output shaft speed is within the speed difference permissible range of the motor speed in accordance with the gear ratio of each gear position commanded by the hybrid vehicle control ECU assembly.

Note

This DTC is output based on the mechanical gear position inside the transmission. Therefore, check the "Current Calculated Gear Position" Data List item.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P279762 Auxiliary Transmission Fluid Pump Signal Compare Failure

    Either condition is met:

  • Difference between the oil pump rotation speed requested by the hybrid vehicle control ECU assembly and the actual rotation speed exceeds a specified value constantly for a specified time.

  • Difference in MG2 (motor) speed and output speed (SP2) exceeds the specified speed (the engine or the MG2 (motor) revs freely) constantly for a specified time with each gear.

(1-trip detection logic)

  • Solenoid (SC1) valve

  • Solenoid (SC2) valve

  • Solenoid (SL1) valve

  • Solenoid (SL2) valve

  • Solenoid (SL3) valve

  • Solenoid (SL4) valve

  • Solenoid (SLT) valve

  • Transmission valve body assembly

  • Hybrid vehicle transmission assembly

  • Oil with motor pump assembly

  • Hybrid vehicle control ECU assembly

  • OIL PMP relay

  • Fusible link (OIL PMP)

  • Wire harness or connector

 Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P279762 Transmission Fluid Pump Motor Revolution
Related Active Test
DTC No. Active Test
P279762 Control the Transmission Oil Pump*
*: When the motor is malfunctioning, a deviation may occur between the GTS motor speed command and the actual motor speed.

CONFIRMATION DRIVING PATTERN

Tech Tips

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.

Click here


  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 (READY).

  6. With the brake pedal depressed, move the shift lever to select shift position D.

  7. Stop the vehicle in EV mode for 20 seconds or more.

  8. While driving in EV mode (engine stopped), drive a few seconds with the accelerator pedal released slightly.

    CAUTION:

    Strictly observe posted speed limits, traffic laws and road conditions when performing this test.

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

  10. Check the DTC judgment result.

    Tech Tips


    • 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 or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0C2996.

Click here

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Read the DTCs using the GTS.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P279762 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
      DTC No. Relevant DTC
      P0C2996 Auxiliary Transmission Fluid Pump Driver Circuit Component Internal Failure
      P0C2B31 Auxiliary Transmission Fluid Pump Control Module Feedback Signal No Signal
      P317511 Oil Pump Motor Temperature Sensor Circuit Short to Ground
      P317515 Oil Pump Motor Temperature Sensor Circuit Short to Auxiliary Battery or Open

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL) Click here

    A

  2. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Read the DTCs using the GTS.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P279762 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
      DTC No. Relevant DTC
      P074513 Pressure Control Solenoid "A" Circuit Open
      P076A11 Shift Solenoid "H" Control Circuit Short to Ground
      P076A15 Shift Solenoid "H" Control Circuit Short to Battery or Open
      P077513 Pressure Control Solenoid "B" Circuit Open
      P079513 Pressure Control Solenoid "C" Circuit Open
      P08CC11 Shift Solenoid "J" Control Circuit Short to Ground
      P08CC15 Shift Solenoid "J" Control Circuit Short to Battery or Open
      P271313 Pressure Control Solenoid "D" Circuit Open
      P280713 Pressure Control Solenoid "G" Circuit Open

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL) Click here

    A

  3. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Read the DTCs using the GTS.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      Only DTC P279762 is output A
      DTC P279762 and other DTCs are output B

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL) Click here

    A

  4. CHECK OIL PUMP MOTOR CIRCUIT

    Click here

    Tech Tips

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

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here