STOP AND START SYSTEM, Diagnostic DTC:P161D9E

DTC Code DTC Name
P161D9E Starter Delay Circuit Stuck On

DESCRIPTION

By using the starter delay circuit, the engine stop and start ECU can activate the ST NO. 2 relay (for starter motor operation) after activating the ST relay (for starter pinion operation) to operate the starter assembly.

By monitoring the condition of the ST relay (for starter pinion operation) and ST NO. 2 relay (for starter motor operation), the engine stop and start ECU detects if the transistor of the starter delay circuit is stuck. If the transistor of the starter delay circuit is stuck on, the engine stop and start ECU blinks the stop and start cancel indicator and stores DTC P161D9E. If the transistor of the starter delay circuit is stuck on, the ST relay (for starter pinion operation) and ST NO. 2 relay (for starter motor operation) will be activated simultaneously.

B005AIKE03
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory Note
P161D9E Starter Delay Circuit Stuck On

Both of the following conditions are met (1 trip detection logic):


  • Engine switch on (IG)

  • Time between ST relay (for starter pinion) turning on and ST NO. 2 relay (for starter motor) turning on becomes less than 0.016 seconds and 3 times or more.

 Engine stop and start ECU Blinks DTC stored SAE Code: P161D

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. 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.

    11. Depress the brake pedal and stop the vehicle.

    12. Keep the engine stopped by stop and start control. (Keep the shift lever in D.)

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

    14. 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.

    15. Depress the brake pedal and stop the vehicle.

    16. Keep the engine stopped by stop and start control. (Keep the shift lever in D.)

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

    18. 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 P061519.

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

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 (STA, STA2 SIGNAL)


    1. Connect an oscilloscope to the STA, STA2 and DGND terminals of the stop and start ECU connector.

      B0059YTC49
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -
    2. B0057H0E08
      *1 (ST Relay)
      *2 (ST NO. 2 Relay)
      *3 0.016 seconds or more

      Check the waveform immediately after turning the engine switch on (START).

      Item Condition
      Tester Connection

      A38-21 (STA) - A38-6 (DGND)

      A38-23 (STA2) - A38-6 (DGND)
      Condition Engine started by engine switch operation
      Result
      Result Proceed to
      Time between ST relay (for starter pinion) turning on and ST NO. 2 relay (for starter motor) turning on becomes 0.016 seconds or more A
      Time between ST relay (for starter pinion) turning on and ST NO. 2 relay (for starter motor) turning on becomes less than 0.016 seconds B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE ENGINE STOP AND START ECU Click here