STOP AND START SYSTEM, Diagnostic DTC:P094296

DTC Code DTC Name
P094296 Hydraulic Pressure Unit Component Internal Failure

DESCRIPTION

Refer to DTC P0C2B11

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory Note
P094296 Hydraulic Pressure Unit Component Internal Failure

for 8AR-FTS:

The following condition continues for 0.05 seconds or more (2 trip detection logic):


  • Difference between turbine speed and output shaft speed is 120 rpm or more within 0.2 seconds after engine restarted during idling stop when shift lever is in D or M.

for 3ZR-FAE:

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. With the shift lever in D or M, the engine is stopped by the start and stop system.

  2. Secondary oil pressure is lower than the specified value.

  3. 2 seconds after engine stopped by stop and start system

  4. 1-trip detection logic

  • for 8AR-FTS:

    Oil pump assembly with motor (Automatic transaxle assembly)

  • for 3ZR-FAE:

    Oil pump assembly with motor (Continuously variable transaxle assembly)

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P0942

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


  • for 8AR-FTS:

    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.

    Click here

  • for 3ZR-FAE:

    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 sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • for 8AR-FTS:

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

    Click here

  • for 3ZR-FAE:

    Bleed the oil pump assembly with motor (continuously variable transaxle assembly) after removing and installing the continuously variable transaxle assembly or replacing the CVT fluid.

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


    1. Drive the vehicle to warm up the engine and automatic transaxle*1 or CVT*2 fluid.

      Tech Tips

      The oil pump assembly with motor (automatic transaxle assembly*1, continuously variable transaxle assembly*2) may not operate properly if the automatic transaxle*1 or CVT*2 fluid temperature is low. Make sure to warm up the automatic transaxle*1 or CVT*2 fluid before performing the Active Test. (Automatic transaxle fluid temperature: 25°C (77°F) or higher*1, CVT fluid temperature: 30°C (86°F) or higher*2)


      • *1: for 8AR-FTS

      • *2: for 3ZR-FAE

    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 the EMOP and DGND terminals of the engine stop and start ECU connector.

    6. Connect an oscilloscope to terminals A38-27 (NOPM) and A38-6 (DGND).

      B0059YTC46
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -

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

    8. B005856E03
      *a 5 V/DIV.
      *b 5 ms./DIV.

      Check the waveform while performing the Active Test.

      Item Condition
      Tester Connection A38-27 (NOPM) - A38-6 (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)

      		 (for 8AR-FTS) B

      Except 17 to 200 Hz

      (Abnormal Waveform)

      		 (for 3ZR-FAE) C

      Tech Tips


      • 17 Hz: Period is 59 ms (oil pump assembly with motor (automatic transaxle assembly*1, continuously variable transaxle assembly*2) speed is approximately 510 rpm).

      • 200 Hz: Period is 5 ms (oil pump assembly with motor (automatic transaxle assembly*1, continuously variable transaxle assembly*2) speed is approximately 6000 rpm).

      • The higher the oil pump assembly with motor (automatic transaxle assembly*1, continuously variable transaxle assembly*2) speed becomes, the shorter the wavelength.


      • *1: for 8AR-FTS

      • *2: for 3ZR-FAE


    B

    REPLACE AUTOMATIC TRANSAXLE ASSEMBLY for U661E: Click here for U661F: Click here

    C

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY for K114: Click here for K114F: Click here

    A

  2. 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

  3. CHECK DTC OUTPUT


    1. Turn the engine switch on (IG).

    2. Start the engine.

    3. Perform a road test.

    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 P094296 is output A
      DTC P094296 is not output B

    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    USE SIMULATION METHOD TO CHECK Click here