STOP AND START SYSTEM, Diagnostic DTC:P1539

DTC Code DTC Name
P1539 AT Oil Pump

DESCRIPTION

When the engine automatically stops, the front oil pump of the continuously variable transaxle assembly also stops.

For a smooth start of the vehicle, during the period between the engine automatic stop and vehicle restart, the oil pressure in the continuously variable transaxle assembly is maintained by operating the oil pump motor assembly.

The engine stop and start ECU switches the oil pump motor control relay to on with the output signal from the OPM2 terminal, supplies power to the oil pump motor assembly from the eco run vehicle converter assembly (backup boost converter), and operates the oil pump motor assembly with the output signal from the OPM1 terminal.

The state of the oil pump motor assembly is input to the engine stop and start ECU through the OPST signal line.

DTC No. Freeze Frame Data * DTC Detection Condition Trouble Area
P1539 O/P Signal Fixed ON

The following condition continues for 2 seconds or more (1 trip detection logic):


  • When the oil pump motor assembly is requested to stop, a signal of motor normal running is input.

  • 0.5 seconds after the oil pump motor control relay is turned on

 Engine stop and start ECU
O/P Signal Fixed OFF

The following condition continues for 2 seconds or more (1 trip detection logic):


  • When the oil pump motor assembly is requested to drive, a signal of motor normal stopping is input.

  • 0.5 seconds after the oil pump motor control relay is turned on

  • Continuously variable transaxle assembly

  • Engine stop and start ECU

  • Harness or connector
O/P No Synchro Signal

The following condition continues for 2 seconds or more (1 trip detection logic):


  • When the oil pump motor assembly is requested to drive, a motor start malfunction or motor abnormal rotation signal is input.

  • 0.5 seconds after the oil pump motor control relay is turned on

  • Continuously variable transaxle assembly

  • Engine stop and start ECU

  • Harness or connector
O/P Motor Curr Abnormal

The following condition continues for 2 seconds or more (1 trip detection logic):


  • A motor power supply current abnormal signal is input.

  • 0.5 seconds after the oil pump motor control relay is turned on

  • Continuously variable transaxle assembly

  • Engine stop and start ECU

  • Harness or connector

*: Since each information can be confirmed by freeze frame data, record the freeze frame data before deleting the diagnosis code.


  1. After troubleshooting, perform the following steps to recheck for DTCs and check if the Stop and Start system operates normally.

    Tech Tips


    • If the battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.

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


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Start the engine and warm it up.

    4. Drive the vehicle at 20 km/h (12.4 mph) or more.

    5. Stop the vehicle, allow the engine to stop due to Stop and Start system control and wait for 3 seconds or more.

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

      Tech Tips

      If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

    7. Check that no DTCs are output Click here.

  2. Check if the Stop and Start system operates normally.

    Tech Tips


    • If the battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.

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


    1. Warm up the engine.

    2. Turn the air conditioning system off.

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

    4. Stop the vehicle with the shift lever in D and depressed the brake pedal.

    5. Check that the engine stops.

    6. Release the brake pedal and check that the engine restarts.

WIRING DIAGRAM

Refer to DTC P1538 Click here.

CAUTION / NOTICE / HINT

Note


  • If the engine stop and start ECU is being replaced, register the previously recorded number of starter operations into the new engine stop and start ECU Click here.

  • After the engine stop and start ECU is replaced or after an air conditioner kit is installed, clear the A/C information stored in the engine stop and start ECU Click here.

  • When the engine stop and start ECU or components of the VSC system are replaced, initialization/obtainment of 0 point learning information is performed for the engine stop and start ECU Click here.

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 Click here.

  • When P1538 and P1539 are simultaneously output, check P1538 first Click here.

PROCEDURE


  1. CONFIRM DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Check for DTCs and read the freeze frame data.

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

    B

    GO TO DTC CHART (P1538)

    A

  2. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Using the intelligent tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item Proceed to
      "O/P Signal Fixed ON" is ON A
      "O/P Signal Fixed OFF" is ON B
      "O/P No Synchro Signal" is ON C
      "O/P Motor Curr Abnormal" is ON D

    A

    REPLACE ENGINE STOP AND START ECU Click here

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo)) Click here

    D

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo)) Click here

    B

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo))


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

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Connect an oscilloscope to the OPM1 and GND terminals of the engine stop and start ECU connector.

      A005H5KE01
      Text In Illustration
      *a

      Component with harness connected

      (Engine stop and start ECU)

      		 - -
      Item Condition
      Tester connection OPM1 - GND
      Tool setting 5 V/DIV, 5 ms/DIV
      Condition Active Test is in operation
    7. A005I3KE01
      Text In Illustration
      *a Normal waveform
      *b Abnormal waveform

      Check the waveform when Active Test is in operation.

      OK
      No noise to break the waveform is detected, and approximately 43% of the waveform are output.
      Result
      The state of the waveform Proceed to

      38-48 %

      (Normal waveform)

      		 A
      There is a noise in the normal waveform. B

      5-15 %

      (Abnormal waveform)

      		 C

    B

    REPAIR OR REPLACE NOISE SOURCE, HARNESS OR CONNECTOR

    C

    REPLACE ENGINE STOP AND START ECU Click here

    A

  4. INSPECT ENGINE STOP AND START ECU (OPST SIGNAL)


    1. Connect an oscilloscope to the OPST and GND terminals of the engine stop and start ECU connector.

      A005IW2E01
      Text In Illustration
      *a

      Component with harness connected

      (Engine stop and start ECU)

      		 - -
      Item Condition
      Tester connection OPST - GND
      Tool setting 5 V/DIV, 5 ms/DIV
      Condition Active Test is in operation
    2. A005MIAE01
      Text In Illustration
      *a Normal waveform
      *b Abnormal waveform

      Check the waveform when Active Test is in operation.

      OK
      No noise to break the waveform is detected, and approximately 50% of the waveform are output.
      Result
      The state of the waveform Proceed to

      45-55 %

      (Normal waveform)

      		 A
      There is a noise in the normal waveform. B

      5-35 %

      (Abnormal waveform)

      		 C

    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    REPAIR OR REPLACE NOISE SOURCE, HARNESS OR CONNECTOR

    C

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo))


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

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Connect an oscilloscope to the OPST and GND terminals of the engine stop and start ECU connector.

      A005IW2E01
      Text In Illustration
      *a

      Component with harness connected

      (Engine stop and start ECU)

      		 - -
      Item Condition
      Tester connection OPST - GND
      Tool setting 5 V/DIV, 5 ms/DIV
      Condition Active Test is in operation
    7. A005MH7E01
      Text In Illustration
      *a Normal waveform
      *b Abnormal waveform

      Check the waveform when Active Test is in operation.

      OK
      No noise to break the waveform is detected, and approximately 50% of the waveform are output.
      Result
      The state of the waveform Proceed to

      65-75 %

      (Abnormal waveform)

      		 A

      45-55 %

      (Normal waveform)

      		 B
      There is a noise in the normal waveform. C

    B

    CLEAR DTC Click here

    C

    REPAIR OR REPLACE NOISE SOURCE, HARNESS OR CONNECTOR

    A

  6. READ VALUE USING INTELLIGENT TESTER (A/T OIL PRESSURE (CVT OIL PRESSURE))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. In accordance with the display on the tester, read the Data List.

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Pressure

      Secondary oil pressure value/

      min.: -64 MPa

      max.: 63.998 MPa

      During idling stop

      0.17 to 0.45 MPa

      		 -
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

  7. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo))


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

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Connect an oscilloscope to the OPST and GND terminals of the engine stop and start ECU connector.

      A005IW2E01
      Text In Illustration
      *a

      Component with harness connected

      (Engine stop and start ECU)

      		 - -
      Item Condition
      Tester connection OPST - GND
      Tool setting 5 V/DIV, 5 ms/DIV
      Condition Active Test is in operation
    7. A005HB7E01
      Text In Illustration
      *a Normal waveform
      *b Abnormal waveform

      Check the waveform when Active Test is in operation.

      OK
      No noise to break the waveform is detected, and approximately 50% of the waveform are output.
      Result
      The state of the waveform Proceed to

      45-55 %

      (Normal waveform)

      		 A
      There is a noise in the normal waveform. B

      85-95 %

      (Abnormal waveform)

      		 C

    B

    REPAIR OR REPLACE NOISE SOURCE, HARNESS OR CONNECTOR

    C

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

    A

  8. CLEAR DTC

    Note

    Before deleting the diagnosis code, be sure to store the freeze frame data.


    1. Clear the DTC Click here.


    NEXT

  9. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (Activate the AT Oil Pump (Lo))


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

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Connect an oscilloscope to the OPST and GND terminals of the engine stop and start ECU connector.

      A005IW2E01
      Text In Illustration
      *a

      Component with harness connected

      (Engine stop and start ECU)

      		 - -
      Item Condition
      Tester connection OPST - GND
      Tool setting 5 V/DIV, 5 ms/DIV
      Condition Active Test is in operation
    7. A005KSSE01
      Text In Illustration
      *a Normal waveform

      Check the waveform when Active Test is in operation.

      OK
      No noise to break the waveform is detected, and approximately 50% of the waveform are output.

    NG

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here

    OK

  10. CONFIRM DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Start the engine.

    4. Drive the vehicle with a stop-and-go city drive pattern for more than 15 minutes.

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

    6. Confirm that the DTC is not output again.

      Result
      Result Proceed to
      DTC P1539 is output A
      DTC is not output B

      Tech Tips

      When the diagnosis code is not displayed, there is a possibility that the oil pump motor cannot run because of a blockage in the hydraulic circuit temporarily.


    B

    END

    A

  11. READ VALUE USING INTELLIGENT TESTER (A/T OIL PRESSURE (CVT OIL PRESSURE))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. In accordance with the display on the tester, read the Data List.

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Pressure

      Secondary oil pressure value/

      min.: -64 MPa

      max.: 63.998 MPa

      During idling stop

      0.17 to 0.45 MPa

      		 -
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY Click here