STOP AND START SYSTEM(for 3ZR-FAE), Diagnostic DTC:P0942

DTC Code DTC Name
P0942 Hydraulic Pressure Unit

DESCRIPTION

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DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P0942 Hydraulic Pressure Unit

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

  • Oil pump assembly with motor (Continuously variable transaxle assembly)

  • Engine stop and start ECU

 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 negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.

    • 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 ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

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      Powertrain > Stop and Start > Clear 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.

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      Powertrain > Stop and Start > Trouble Codes

  2. STOP AND START SYSTEM OPERATION CHECK

    Tech Tips

    If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.


    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


  • 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 ignition switch to ON and wait 20 seconds, then confirm that "OK" is displayed for the Data List item "Oper Prohibition (O/P Air Bleeding)". Then upload the previous status (number of starter operations) to the 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 or airbag sensor assembly clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

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  • 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.

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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.

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PROCEDURE


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


    1. Drive the vehicle to warm up the engine and CVT fluid.

      Tech Tips

      The oil pump assembly with motor (continuously variable transaxle 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 ignition switch to ON.

      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).

      B0029NOC01
      *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).


      Powertrain > Stop and Start > Active Test
      Tester Display
      AT Oil Pump (Lo)
    7. B0029BME03
      *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

      • Ignition switch ON (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

      Tech Tips


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

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

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


    B

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY Click here

    A

  2. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 ignition switch to ON.

    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 P0942 is output A
      DTC P0942 is not output B

    A

    REPLACE ENGINE STOP AND START ECU Click here

    B

    USE SIMULATION METHOD TO CHECK Click here