STOP AND START SYSTEM, Diagnostic DTC:P1539

DTC Code DTC Name
P1539 AT Oil Pump

DESCRIPTION

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DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P1539 AT Oil Pump

Both 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

Both 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

  • Oil pump with motor assembly (Automatic transaxle assembly)

  • Engine stop and start ECU

  • Wire harness or connector

 Blinks DTC stored

CONFIRMATION DRIVING PATTERN

Tech Tips

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.

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  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) and turn the GTS on.

    3. Clear the DTCs.

    4. Start the engine and warm it up.

    5. 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.

    6. Depress the brake pedal and stop the vehicle.

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

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

    9. Check that no DTCs are output.

  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

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CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

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  • 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.

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  • After replacing the engine stop and start ECU, airbag sensor assembly*1 or yaw rate and acceleration sensor*2, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

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    • *1: for Optitron Meter Type

    • *2: for TFT Meter Type

  • Bleed the oil pump with motor assembly (automatic transaxle assembly) after removing and installing the automatic transaxle assembly or replacing the automatic transaxle fluid.

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Tech Tips


  • If DTCs P1538 and P1539 are output simultaneously, troubleshoot for DTC P1538 first.

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  • 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.

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PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1539)


    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

      Result
      Result Proceed to
      DTC P1539 is output A
      DTCs P1538 and P1539 are output B

    B

    GO TO DTC P1538 Click here

    A

  2. CHECK ENGINE STOP AND START ECU (NOPM TERMINAL WAVEFORM)


    1. Drive the vehicle to warm up the engine and automatic transaxle fluid.

      Tech Tips

      The oil pump with motor assembly (automatic transaxle assembly) may not operate properly if the automatic transaxle fluid temperature is low. Make sure to warm up the automatic transaxle fluid before performing the Active Test. (Automatic transaxle 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 A66-27 (NOPM) and A66-6 (DGND).

      B007ZLRC44
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -

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

    7. B007ZPHE03
      *a 5 V/DIV.
      *b 5 ms./DIV.

      Check the waveform while performing the Active Test.

      Item Condition
      Tester Connection A66-27 (NOPM) - A66-6 (DGND)
      Tool Setting 5 V/DIV., 5 ms./DIV.
      Condition

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

      • Active Test "AT Oil Pump (Lo)" 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 (automatic transaxle assembly) speed is approximately 510 rpm).

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

      • The higher the oil pump with motor assembly (automatic transaxle assembly) speed becomes, the shorter the wavelength.


    B

    REPLACE AUTOMATIC TRANSAXLE ASSEMBLY for U661E: Click here for U661F: 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
      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK DTC OUTPUT


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

    2. Turn the engine switch on (IG).

    3. Start the engine.

    4. Perform a road test.

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

    6. Read the DTCs.


      Powertrain > Stop and Start > Trouble Codes
      Result
      Result Proceed to
      DTC P1538 is output A
      DTC P1538 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 (automatic transaxle assembly) from rotating.


    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    END