Inspection Procedure 5: AS&G System Abnormal (auto stop not carried out)



caution If the following services are performed, the backup data should be deleted. Do not perform these services without carrying out the check described in Step 2.

  • In case the cable is disconnected from the battery terminal
  • In case the connector is disconnected from the engine-ECU

FUNCTION


If the specified conditions are satisfied, the AS&G-ECU should send the engine stop request signal to the engine-ECU via CAN. When receiving the signal, the engine-ECU should stop the engine.

COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Confirm the vehicle status and the ambient conditions.



  • Confirm the vehicle status or the ambient conditions to check whether the auto stop should be carried out or not (Refer to ).

Q. Are the conditions for prohibiting the auto stop satisfied?

Check end.
Go to Step 2.

STEP 2. M.U.T.-III diagnosis code


Confirm the diagnosis code is set from the following ECU.

  • AS&G-ECU
  • Engine-ECU
  • CVT-ECU
  • ASC-ECU
  • Combination meter
  • EPS-ECU
  • A/C-ECU
  • ETACS-ECU

Q. Is the diagnosis code set?

YES <Diagnosis code is set from the AS&G-ECU> : Perform the troubleshooting of the AS&G-ECU (Refer to ).
YES <Diagnosis code is set from the engine-ECU> : Perform the troubleshooting of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Inspection Chart for Diagnosis Code ).
YES <Diagnosis code is set from the CVT-ECU> : Perform the troubleshooting of the CVT-ECU (Refer to GROUP 23A - Troubleshooting - Diagnosis Code Chart ).
YES <Diagnosis code is set from the ASC-ECU> : Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).
YES <Diagnosis code is set from the combination meter> : Perform the troubleshooting of the combination meter (Refer to GROUP 54A - Combination Meter - Diagnosis Code Chart ).
YES <Diagnosis code is set from the EPS-ECU> : Perform the troubleshooting of the EPS-ECU (Refer to GROUP 37 - Troubleshooting - Diagnosis Code Chart ).
YES <Diagnosis code is set from the A/C-ECU> : Perform the troubleshooting of the A/C-ECU (Refer to GROUP 55 - Troubleshooting - Diagnosis Code Chart ).
YES <Diagnosis code is set from the ETACS-ECU> : Perform the troubleshooting of the ETACS-ECU (Refer to GROUP 54A - ETACS - Diagnosis Code Chart ).
Go to Step 3.

STEP 3. M.U.T.-III data list



  • Item 11: ENG ECU AS&G system failure
  • Item 38: T/M ECU AS&G system failure
  • Item 39: ASC ECU AS&G system failure
OK: OFF (Ignition switch: ON)

Q. Is the check result normal?

Go to Step 4.
NO <The display status "ON" to item 11> : Perform the troubleshooting of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Inspection Chart for Diagnosis Code ).
NO <The display status "ON" to item 38> : Perform the troubleshooting of the CVT-ECU.
NO <The display status "ON" to item 39> : Perform the troubleshooting of the ASC-ECU.

STEP 4. M.U.T.-III data list



  • Item 12: Idle Stop enable (A/C ECU)
  • Item 13: Idle Stop enable (ENG ECU)
  • Item 36: Idle Stop enable (T/M ECU)
  • Item 37: Idle Stop enable (ASC ECU)
OK: The display status "Enable"

Q. Is the check result normal?

Go to Step 6.
NO <"Disable" is displayed in item 12.> : It is estimated to be the output of the automatic stop prohibition signal of A/C-ECU. Recheck the auto stop prohibition signal of A/C ECU.
NO <"Disable" is displayed in item 13.> : It is estimated to be the output of the automatic stop prohibition signal of engine-ECU. Go to Step 15.
NO <"Disable" is displayed in item 36.> : It is estimated to be the output of the automatic stop prohibition signal of CVT-ECU. Perform the troubleshooting of the CVT-ECU (Refer to GROUP 23A - Troubleshooting - Diagnosis Code Chart ).
NO <"Disable" is displayed in item 37.> : It is estimated to be the output of the automatic stop prohibition signal of ASC-ECU. Go to Step 5.

STEP 5. Check the hydraulic unit (integrated with ASC-ECU) part number.


Q. Is the check result normal?

Go to Step 25.
Replace the hydraulic unit (integrated with ASC-ECU).

STEP 6. M.U.T.-III data list



  • Item 4: Engine hood
OK:
    Close (Hood: Closed)
    Open (Hood: Opened)
note If the engine hood is opened, the AS&G indicator/display in the combination meter should blink.

Q. Is the check result normal?

Go to Step 7.
Perform the troubleshooting of the engine hood latch switch circuit (Refer to GROUP 54A - ETACS - Input Signal Procedures - The Hood Latch Switch Signal is not Sent to The ETACS-ECU ).

STEP 7. M.U.T.-III data list



  • Item 15: Ambient temperature
OK: At ambient temperature (atmospheric temperature) or equivalent

Q. Is the check result normal?

Go to Step 8.
Perform the troubleshooting of the ambient temperature sensor (Refer to GROUP 55 - Troubleshooting - Symptom Chart ).

STEP 8. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 30: Brake lamp SW

Q. Is the check result normal?

Go to Step 11.
Go to Step 9.

STEP 9. M.U.T.-III data list



  • Check the data lists of the ETACS-ECU (Refer to GROUP 54A - Troubleshooting - Data List Reference Table ).
  • Item 290: Stop lamp switch
OK: ON (Depress the brake pedal), OFF (Release the brake pedal)

Q. Is the check result normal?

Go to Step 25.
Go to Step 10.

STEP 10. Check the stop lamp switch.


Check the stop lamp switch (Refer to GROUP 35A - Brake pedal - Stop Lamp Switch Check ).

Q. Is the check result normal?

Check the abnormality of relevant stop lamp switch circuit.
Replace the AS&G OFF switch.

STEP 11. M.U.T.-III data list



  • Item 35: Driver’s side door SW
OK:
    Open (Driver’s side door: Opened)
    Close (Driver’s side door: Closed)
note If the driver’s side door is opened, the AS&G indicator/display in the combination meter should blink.

Q. Is the check result normal?

Go to Step 12.
Perform the troubleshooting of the driver’s side door switch circuit (Refer to GROUP 54A - ETACS - Input Signal Procedures - The Front Door Switch (RH) Signal is not Sent to The ETACS-ECU ).

STEP 12. M.U.T.-III data list



  • Item 10: Seat belt fasten status
OK:
    Fastened (Driver’s seat belt: Fastened)
    Not fastened (Driver’s seat belt: Not fastened)
note If the driver’s seat belt is unfastened, the AS&G indicator/display in the combination meter should blink.

Q. Is the check result normal?

Go to Step 13.
Check the relevant to the seat belt in accordance with "Check Procedure for Each Multi Information Display Screen" of the combinations meter (Refer to GROUP 54A - Combination Meter - Symptom Procedures - Check Procedure for Each Multi Information Display Screen ).

STEP 13. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 29: Parking brake SW

Q. Is the check result normal?

Go to Step 14.
Check the relevant to the parking brake switch in accordance with "Check Procedure for Each Multi Information Display Screen" of the combinations meter (Refer to GROUP 54A - Combination Meter - Symptom Procedures - Check Procedure for Each Multi Information Display Screen ).

STEP 14. M.U.T.-III data list



  • Check the data lists of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Data List Reference Table).
  • Item 10: Master cylinder pressure

Q. Is the check result normal?

Go to Step 15.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 15. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 17: Vehicle speed

Q. Is the check result normal?

Go to Step 16.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 16. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 44: Yaw rate sensor

Q. Is the check result normal?

Go to Step 17.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 17. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 18: Accelerator pedal position

Q. Is the check result normal?

Go to Step 18.
Perform the troubleshooting of the accelerator pedal position sensor (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 18. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 45: Brake booster pressure

Q. Is the check result normal?

Go to Step 19.
Perform the troubleshooting of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 19. M.U.T.-III data list



  • Check the data lists of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Data List Reference Table ).
  • Item 6: Engine coolant temperature sensor
OK:
    Engine cold state: At ambient temperature (atmospheric temperature) or equivalent.
    Engine hot state: At 80 - 120°C

Q. Is the check result normal?

Go to Step 20.
Perform the troubleshooting of the engine coolant temperature sensor (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 20. M.U.T.-III data list



  • Check the data lists of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Data List Reference Table ).
  • Item 160: Battery temperature

Q. Is the check result normal?

Go to Step 21.
Perform the troubleshooting of the engine coolant temperature sensor (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 21. Confirm the check result.



  • Check the following items.

  1. After a malfunction occurs, the negative (-) cable is disconnected from the battery once.
  2. After a malfunction occurs, the connector is disconnected from the engine-ECU once.

Q. Is any of the items above true?

Go to Step 22.
Go to Step 25.

STEP 22. M.U.T.-III data list



  1. Disconnect the negative (-) cable from the battery (this can delete backup data).
  2. Charge the battery (Refer to GROUP 54A - Battery - On-vehicle Service - Charging ).
  3. As soon as the battery is charged, leave the engine idling and turn off lamps and all accessories.
  4. Check the data lists of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Data List Reference Table ).

  • Item No. 165: Charging battery mode flag
OK: The display status "ON" is changed to "OFF" within approximately 10 minutes.

Q. Is the check result normal?

Turn the ignition switch to "ON" position after stopping the engine. Then go to Step 24.

    Go to Step 23.

STEP 23. M.U.T.-III data list



  1. Turn the ignition switch to "ON" position (But do not start the engine).
  2. Check the data lists of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Data List Reference Table ).

  • Item No. 169: Vehicle Consumption Current
OK: When the headlamp is lit, the numerical value should increase.

Q. Is the check result normal?

Replace the battery.
Replace the battery current sensor.

STEP 24. Judge the battery life.



    1. Turn the ignition switch to "ON" position (But do not start the engine).
    2. Check the data lists of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Data List Reference Table ) and adjust the electrical load so that the displayed value should be 30 ± 2 A.

    • Item No. 169: Vehicle Consumption Current
    3. Continue the conditions of Step 2 for 120 seconds and discharge the battery.
    4. Run the engine for 10 seconds after the engine start and check on the battery deterioration with data lists of the engine-ECU.

    • Item No. 152: Check battery flag
OK: OFF (Engine: Idle operation)

    5. After checking that the data list item No. 152 of the engine-ECU is displayed, swiftly turn the ignition switch to "LOCK" (OFF) position and leave it for 10 seconds.
    6. Repeat Steps 1-5 four times. Check that data list item No. 152 always shows "OFF".

Q. Is the check result normal?

Recharge the battery because the battery is discharged during the check. (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Charging ). After the battery is charged, go to Step 25.
Replace the battery.

STEP 25. Check the trouble symptom.


Q. Does the trouble symptom persist?

Replace the AS&G-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).