STOP AND START SYSTEM(for 2AR-FE), Diagnostic DTC:P279796

DTC Code DTC Name
P279796 Electromagnetic Oil Pump Component Internal Failure

DESCRIPTION

Refer to DTC P0C2B11.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory Note
P279796 Electromagnetic Oil Pump Component Internal Failure

One of the following conditions are met for 2 seconds or more (2 trip detection logic):


  • Oil pump motor relay circuit in the engine stop and start ECU is on.

  • Oil pump with motor assembly is operating even though suspension command is output.

One of the following conditions are met for 2 seconds or more (2 trip detection logic):


  • Oil pump motor relay circuit in the engine stop and start ECU is on.

  • Oil pump with motor assembly does not operate properly when oil pump with motor assembly operation command is output.

  • Wire harness or connector

  • Oil pump with motor assembly

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P2797

CONFIRMATION DRIVING PATTERN


  1. CONFIRMATION AFTER TROUBLESHOOTING

    Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item [Status of Battery Charge Control] changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item [Status of Battery Charge Control] cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the engine switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

    • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Stop and Start > Clear DTCs

    5. Start the engine and warm it up.

    6. Drive the vehicle at 7 km/h (4.3 mph) or more.

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    7. Depress the brake pedal and stop the vehicle.

    8. Keep the engine stopped by stop and start control. (Keep the shift lever in D.)

    9. Release the brake pedal with the shift lever in D to start the engine.

    10. Check that no DTCs are output.


      Powertrain > Stop and Start > Trouble Codes

  2. STOP AND START SYSTEM OPERATION CHECK

    Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item [Status of Battery Charge Control] changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item [Status of Battery Charge Control] cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the engine switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.


    1. Start the engine and warm it up.

    2. Turn the air conditioning system off.

    3. Drive the vehicle at 7 km/h (4.3 mph) or more.

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    4. Depress the brake pedal and stop the vehicle.

    5. Allow the engine to stop by stop and start control. (Keep the shift lever in D.)

    6. Release the brake pedal with the shift lever in D to start the engine.

WIRING DIAGRAM

Refer to DTC P0C2B11.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the engine stop and start ECU with a new one, make sure to download the previous status (number of starter operations) of the old engine stop and start ECU. After replacing the engine stop and start ECU, turn the engine switch on (IG) and wait 20 seconds, then confirm that "OK" is displayed for the Data List item [Stop&Start Operating Permission (Discharged Oil Pump Air)]. Then upload the previous status (number of starter operations) to the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or airbag ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

    Click here

Tech Tips


  • If DTCs P0C2B11 and P279796 are output simultaneously, troubleshoot for DTC P0C2B11 first.

    Click here

  • If DTCs P0C2B15 and P279796 are output simultaneously, troubleshoot for DTC P0C2B15 first.

    Click here

  • DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

    Click here

  • Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

    Click here

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P279796)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    5. Read the DTCs


      Powertrain > Stop and Start > Trouble Codes
      Result
      Result Proceed to
      DTC P279796 is output A
      DTCs P0C2B11 and P279796 are output B
      DTCs P0C2B15 and P279796 are output C

    B

    GO TO DTC P0C2B11 Click here

    C

    GO TO DTC P0C2B15 Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (OIL PUMP)


    1. Drive the vehicle to warm up the engine and continuously variable transaxle assembly.

      Tech Tips

      The oil pump with motor assembly may not operate properly if the CVT fluid temperature is low. Make sure to warm up the CVT fluid before performing the Active Test. (CVT fluid temperature: 25°C (77°F) or higher).

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

      Tech Tips

      Do not start the engine.

    4. Turn the GTS on.

    5. Connect an oscilloscope to terminals NOPM and DGND terminals of the engine stop and start ECU connector.

      B006OEPC02
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -

    6. Enter the following menus: Powertrain / Stop and Start / Active Test / Oil Pump.


      Powertrain > Stop and Start > Active Test
      Tester Display
      Oil Pump
    7. B006NYIE12
      *a 5 V/DIV.
      *b 5 ms./DIV.

      Check the waveform while performing the Active Test.

      Item Condition
      Tester Connection A60-27 (NOPM) - A60-6 (DGND)
      Tool Setting 5 V/DIV., 5 ms./DIV.
      Condition

      • Engine switch on (IG) (engine is stopped)

      • Active Test [Oil Pump] being performed
      Standard
      The waveform is similar to that shown in the illustration with no noise.
      Result
      Result Proceed to

      17 to 200 Hz

      (Normal Waveform)

      		 A

      Except 17 to 200 Hz

      (Abnormal Waveform)

      		 B
      Normal Waveform with Noise C

      Tech Tips


      • 17 Hz: Period is 59 ms (oil pump with motor assembly speed is approximately 510 rpm).

      • 200 Hz: Period is 5 ms (oil pump with motor assembly speed is approximately 6000 rpm).

      • The higher the oil pump with motor assembly speed becomes, the shorter the wavelength.


    B

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY (CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY) Click here

    C

    REPAIR OR REPLACE NOISE SOURCE

    A

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    5. Clear the DTCs.


      Powertrain > Stop and Start > Clear DTCs

    6. Turn the engine switch off and wait for 30 seconds or more.

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P279796)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.


      Powertrain > Stop and Start > Trouble Codes
      Result
      Result Proceed to
      DTC P279796 is output A
      DTC P279796 is not output B

      Tech Tips

      If this DTC is not output again, it may have been stored when blockage temporarily prevented the oil pump with motor assembly from rotating.


    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    END