STOP AND START SYSTEM(for 2AR-FE), Diagnostic DTC:P158954

DTC Code DTC Name
P158954 G Sensor Zero Point Calibration Incomplete

DESCRIPTION

If the vehicle is driven before calibration of the deceleration sensor zero point is performed, the engine stop and start ECU stores DTC P158954 and blinks the stop and start cancel indicator.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory Note
P158954 G Sensor Zero Point Calibration Incomplete

Both of the following conditions are met for 5 seconds or more (1 trip detection logic):


  • The vehicle speed is 3 km/h (2 mph) or more and skid control ECU (brake actuator assembly) communication is normal.

  • Deceleration sensor zero point calibration is incomplete.

  • The deceleration sensor zero point calibration has not been performed.

  • Airbag ECU assembly

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P1589

CONFIRMATION DRIVING PATTERN


  1. 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.

    CONFIRMATION AFTER TROUBLESHOOTING


    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 3 km/h (2 mph) or more for 5 seconds or more.

      CAUTION:

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

    7. Check that DTCs are not 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 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.

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


  • 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

  • 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

PROCEDURE


  1. PERFORM REGISTRATION (DECELERATION SENSOR ZERO POINT CLEAR, DECELERATION SENSOR ZERO POINT CALIBRATION)

    Note


    • Once the zero point is stored, it cannot be overwritten until the data is cleared. Be sure to perform zero point clear and calibration after replacing the airbag ECU assembly.

    • Park the vehicle on a level surface (grade: +/-1%). Do not shake the vehicle or open/close any of the doors during zero point calibration. To avoid vibration caused by the engine idling, do not start the engine.


    1. Clear the zero point calibration data. (*)


      1. Connect the GTS to the DLC3.

      2. Move the shift lever to P and apply the parking brake.

      3. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      4. Turn the GTS on.

      5. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Clear.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Clear

        Note

        When the deceleration sensor zero point is cleared, the system information stored in the engine stop and start ECU is also cleared. If the vehicle is driven for 5 seconds or more at 3 km/h (2 mph) or more in this condition, the engine stop and start ECU will store DTC P158954 and blink the stop and start cancel indicator.

      6. Turn the engine switch off.

    2. Perform zero point calibration of the deceleration sensor.


      1. Check that the shift lever is in P.

      2. Connect the GTS to the DLC3.

      3. Check that the parking brake is applied.

      4. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      5. Turn the GTS on.

      6. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Calibration.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Calibration

        Tech Tips

        If DTC P158954 is stored, the stop and start cancel indicator will blink.

      7. While keeping the vehicle stationary, follow the prompts on the GTS screen. Check that "Complete" is displayed on the GTS screen.

        Note

        If zero point calibration fails, perform the registration procedure again from (*).

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  2. READ VALUE USING GTS (GRADIENT OF ROAD SURFACE)


    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 / Data List / Gradient of Road Surface.


      Powertrain > Stop and Start > Data List
      Tester Display
      Gradient of Road Surface

    5. Check the road gradient displayed on the GTS.

      OK
      GTS Display Condition Normal Condition
      Gradient of Road Surface

      • Engine switch on (IG)

      • Stop vehicle on level surface

      -0.7 to 0.7 m/s2


      • Engine switch on (IG)

      • Stop vehicle on slope road

      -0.7 m/s2 or less, or 0.7 m/s2or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here

    OK

  3. CHECK AND REPLACE ENGINE STOP AND START ECU


    1. Check and replace the engine stop and start ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. PERFORM REGISTRATION (DECELERATION SENSOR ZERO POINT CLEAR, DECELERATION SENSOR ZERO POINT CALIBRATION)

    Note


    • Once the zero point is stored, it cannot be overwritten until the data is cleared. Be sure to perform zero point clear and calibration after replacing the airbag ECU assembly.

    • Park the vehicle on a level surface (grade: +/-1%). Do not shake the vehicle or open/close any of the doors during zero point calibration. To avoid vibration caused by the engine idling, do not start the engine.


    1. Clear the zero point calibration data. (*)


      1. Connect the GTS to the DLC3.

      2. Move the shift lever to P and apply the parking brake.

      3. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      4. Turn the GTS on.

      5. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Clear.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Clear

        Note

        When the deceleration sensor zero point is cleared, the system information stored in the engine stop and start ECU is also cleared. If the vehicle is driven for 5 seconds or more at 3 km/h (2 mph) or more in this condition, the engine stop and start ECU will store DTC P158954 and blink the stop and start cancel indicator.

      6. Turn the engine switch off.

    2. Perform zero point calibration of the deceleration sensor.


      1. Check that the shift lever is in P.

      2. Connect the GTS to the DLC3.

      3. Check that the parking brake is applied.

      4. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      5. Turn the GTS on.

      6. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Calibration.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Calibration

        Tech Tips

        If DTC P158954 is stored, the stop and start cancel indicator will blink.

      7. While keeping the vehicle stationary, follow the prompts on the GTS screen. Check that "Complete" is displayed on the GTS screen.

        Note

        If zero point calibration fails, perform the registration procedure again from (*).

      Result
      Proceed to
      NEXT

    NEXT

    END

  5. REPLACE AIRBAG ECU ASSEMBLY


    1. Replace the airbag ECU assembly.

      w/o Navigation System: Click here

      w/ Navigation System: Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM REGISTRATION (DECELERATION SENSOR ZERO POINT CLEAR, DECELERATION SENSOR ZERO POINT CALIBRATION)

    Note


    • Once the zero point is stored, it cannot be overwritten until the data is cleared. Be sure to perform zero point clear and calibration after replacing the airbag ECU assembly.

    • Park the vehicle on a level surface (grade: +/-1%). Do not shake the vehicle or open/close any of the doors during zero point calibration. To avoid vibration caused by the engine idling, do not start the engine.


    1. Clear the zero point calibration data. (*)


      1. Connect the GTS to the DLC3.

      2. Move the shift lever to P and apply the parking brake.

      3. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      4. Turn the GTS on.

      5. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Clear.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Clear

        Note

        When the deceleration sensor zero point is cleared, the system information stored in the engine stop and start ECU is also cleared. If the vehicle is driven for 5 seconds or more at 3 km/h (2 mph) or more in this condition, the engine stop and start ECU will store DTC P158954 and blink the stop and start cancel indicator.

      6. Turn the engine switch off.

    2. Perform zero point calibration of the deceleration sensor.


      1. Check that the shift lever is in P.

      2. Connect the GTS to the DLC3.

      3. Check that the parking brake is applied.

      4. Turn the engine switch on (IG).

        Tech Tips

        Do not start the engine.

      5. Turn the GTS on.

      6. Enter the following menus: Powertrain / Stop and Start / Utility / Deceleration Sensor Zero Point Calibration.


        Powertrain > Stop and Start > Utility
        Tester Display
        Deceleration Sensor Zero Point Calibration

        Tech Tips

        If DTC P158954 is stored, the stop and start cancel indicator will blink.

      7. While keeping the vehicle stationary, follow the prompts on the GTS screen. Check that "Complete" is displayed on the GTS screen.

        Note

        If zero point calibration fails, perform the registration procedure again from (*).

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ENGINE STOP AND START ECU Click here