Inspection Procedure 7: AS&G System Abnormal (auto start carried out under condition that brake pedal operated)


FUNCTION


When the specified conditions are satisfied, the AS&G-ECU should send the engine start request signal to the engine-ECU via CAN despite the driver’s determination. When receiving the signal, the engine-ECU should start the engine.

COMMENTS ON TROUBLE SYMPTOM


The failure could possibly be caused by the failed AS&G system. The AS&G-ECU, however, can possibly carry out the forced auto start, depending on the vehicle status or the ambient conditions.

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 forced auto start should be carried out or not (Refer to ).

Q. Are the conditions for carrying out the forced auto start satisfied?
Check end.
Go to Step 2.

STEP 2. M.U.T.-III diagnosis code
Confirm the diagnosis code is set from the below ECU.

  • AS&G-ECU
  • Engine-ECU
  • CVT-ECU
  • ASC-ECU
  • A/C-ECU

Q. Is the diagnosis code set?
YES <Diagnosis code is set from the AS&G-ECU> : Refer to Diagnosis Code Chart .
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 A/C-ECU> : Perform the troubleshooting of the A/C-ECU (Refer to GROUP 55A - Troubleshooting - Diagnosis Code Chart).
Go to Step 3

STEP 3. M.U.T.-III data list
Refer to Data List Reference Table .

  • Item 40: Electric oil pump system failure
OK: OFF (Ignition switch: ON)

Q. Are the check results normal?
Go to Step 4.
Perform the troubleshooting of the CVT-ECU (Refer to GROUP 23A - Troubleshooting - Diagnosis Code Chart ).

STEP 4. M.U.T.-III data list
Refer to Data List Reference Table .

  • Item 17: Vehicle speed

Q. Is the check result normal?
Go to Step 5.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 5. M.U.T.-III data list
Refer to Data List Reference Table .

  • Item 44: Yaw rate sensor

Q. Is the check result normal?
Go to Step 6.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 6. 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 7.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 7. M.U.T.-III data list
Refer to Data List Reference Table .

  • Item 18: Accelerator Pedal Position

Q. Is the check result normal?
Go to Step 8.
Perform the troubleshooting of the accelerator pedal position sensor (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 8. M.U.T.-III data list
Refer to Data List Reference Table .

  • Item 45: Brake booster pressure

Q. Is the check result normal?
Go to Step 9.
Perform the troubleshooting of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Diagnosis Code Chart ).

STEP 9. 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).