STOP AND START SYSTEM(for 2AR-FE), Diagnostic DTC:P30DF62, P30EF4B, P323A00, P323A16, P323AA2, P323B29, P323B38

DTC Code DTC Name
P30DF62 Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure
P30EF4B Backup Boost Converter Circuit Board Over Temperature
P323A00 Backup Boost Converter "A"
P323A16 Backup Boost Converter "A" Circuit Voltage Below Threshold
P323AA2 Backup Boost Converter "A" System Voltage Low
P323B29 Backup Boost Converter "A" Control Circuit Signal Invalid
P323B38 Backup Boost Converter "A" Control Circuit Signal Cycle Invalid

DESCRIPTION

Refer to DTC P323A19.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory Note
P30DF62 Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure

The following conditions is met for 1 second or more (1 trip detection logic):


  • Difference in temperature between thermistor 1 and thermistor 2 of the engine stop and start ECU is 40°C (72°F) or higher.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P30DF
P30EF4B Backup Boost Converter Circuit Board Over Temperature

The following conditions is met for 1 second or more (1 trip detection logic):


  • Engine stop and start ECU thermistor temperature is 135°C (275°F) or higher.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P30EF
P323A00 Backup Boost Converter "A"

The following conditions is met for 1 second or more (1 trip detection logic):


  • Backup boost converter malfunction is detected.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P323A
P323A16 Backup Boost Converter "A" Circuit Voltage Below Threshold

One of the following conditions is met for 2 second or more (1 trip detection logic):


  • IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected.

  • B42 or B43 voltage is 6.0 V or less, backup boost converter is not overheating and backup boost converter output overcurrent is not detected.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P323A
P323AA2 Backup Boost Converter "A" System Voltage Low

The following conditions is met for 1 second or more (1 trip detection logic):


  • Backup boost converter malfunction is detected.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P323A
P323B29 Backup Boost Converter "A" Control Circuit Signal Invalid

The following conditions is met for 1 second or more (1 trip detection logic):


  • Backup boost converter malfunction is detected.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P323C
P323B38 Backup Boost Converter "A" Control Circuit Signal Cycle Invalid

The following conditions is met for 1 second or more (1 trip detection logic):


  • Backup boost converter malfunction is detected.

  • Wire harness or connector

  • Battery

  • BBC NO. 1 fuse

  • BBC NO. 2 fuse

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P323C

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 7 km/h (4 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 for 1 second or more. (Keep the shift lever in D.)

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

      Tech Tips

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

    10. 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 the 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 P323A19.

Click here

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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • 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


  • 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

  • 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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (BIN1 AND BIN2 TERMINALS POWER SOURCE CIRCUIT)

    B006MQSC38
    *a

    Front view of wire harness connector

    (to Engine Stop and Start ECU)

    1. Disconnect the engine stop and start ECU connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A59-1 (BIN2) - Body ground Always 9.5 to 14 V
      A59-3 (BIN1) - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY)

    OK

  2. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL POWER SOURCE CIRCUIT)

    B006PJRC63
    *a

    Front view of wire harness connector

    (to Engine Stop and Start ECU)

    1. Disconnect the engine stop and start ECU connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G50-21 (IG1) - Body ground Engine switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - JUNCTION BLOCK ASSEMBLY LH)

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)


    1. Disconnect the engine stop and start ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A60-6 (DGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)


    1. Disconnect the engine stop and start ECU connector.

    2. Disconnect the air conditioning control assembly connector.

    3. Disconnect the clearance warning ECU assembly connector.

    4. Disconnect the integration control and panel assembly connector.

    5. Disconnect the central gateway ECU (network gateway ECU) connector.

    6. Disconnect the blind spot monitor sensor RH connector.*3

    7. Disconnect the blind spot monitor sensor LH connector.*3

    8. Disconnect the inner rear view mirror assembly connector.

    9. Disconnect the navigation receiver assembly connector.*1

    10. Disconnect the television display assembly connector.*2

    11. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G50-3 (IG41) - G30-5 (IG+) Always Below 1 Ω
      G50-3 (IG41) - G59-1 (IG) Always Below 1 Ω
      G50-3 (IG41) - S8-7 (IG) Always Below 1 Ω
      G50-3 (IG41) - G116-11 (IG1) Always Below 1 Ω
      G50-3 (IG41) - L40-5 (BRB)*3 Always Below 1 Ω
      G50-3 (IG41) - K40-5 (BLB)*3 Always Below 1 Ω
      G50-11 (B43) - G30-1 (+B) Always Below 1 Ω
      G50-11 (B43) - S44-6 (+B) Always Below 1 Ω
      G50-12 (B42) - F1-4 (+B1)*1 Always Below 1 Ω
      G50-12 (B42) - S36-1 (+B)*2 Always Below 1 Ω
      G50-12 (B42) - F16-4 (B)*4 Always Below 1 Ω
      G50-12 (B42) - S37-5 (B)*5 Always Below 1 Ω
      G50-3 (IG41) or G30-5 (IG+) - Body ground and other terminals Always 10 kΩ or higher
      G50-3 (IG41) or G59-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      G50-3 (IG41) or S8-7 (IG) - Body ground and other terminals Always 10 kΩ or higher
      G50-3 (IG41) or G116-11 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      G50-3 (IG41) or L40-5 (BRB)*3 - Body ground and other terminals Always 10 kΩ or higher
      G50-3 (IG41) or K40-5 (BLB)*3 - Body ground and other terminals Always 10 kΩ or higher
      G50-11 (B43) or G30-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      G50-11 (B43) or S44-6 (+B) - Body ground and other terminals Always 10 kΩ or higher
      G50-12 (B42) or F1-4 (+B1)*1 - Body ground and other terminals Always 10 kΩ or higher
      G50-12 (B42) or S36-1 (+B)*2 - Body ground and other terminals Always 10 kΩ or higher
      G50-12 (B42) or F16-4 (B)*4 - Body ground and other terminals Always 10 kΩ or higher
      G50-12 (B42) or S37-5 (B)*5 - Body ground and other terminals Always 10 kΩ or higher

      • *1: w/ Navigation System

      • *2: w/ Rear Seat Entertainment System

      • *3: w/ Blind Spot Monitor System

      • *4: Option connector (for Audioless Type)

      • *5: Option connector (Rear Display)

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR