Inspection Procedure 7: AS&G System Abnormal (auto start carried out under condition that clutch pedal not 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 AS&G-ECU.

Q. Is the diagnosis code set?
Refer to Diagnosis Code Chart .
Go to Step 3

STEP 3. M.U.T.-III diagnosis code

  • Confirm the diagnosis code is set from the engine-ECU.

Q. Is the diagnosis code set?
Perform the troubleshooting of the engine-ECU (Refer to GROUP 13C - Troubleshooting - Inspection Chart for Diagnosis Code <4J1>, Refer to GROUP 13D - Troubleshooting - Inspection Chart for Diagnosis Code <4N1>).
Go to Step 4.

STEP 4. M.U.T.-III diagnosis code

  • Confirm the diagnosis code is set from the A/C-ECU.

Q. Is the diagnosis code set?
Perform the troubleshooting of the A/C-ECU (Refer to GROUP 55 - Troubleshooting - Diagnosis Code Chart ).
Go to Step 5.

STEP 5. M.U.T.-III data list

  • Refer to Data List Reference Table .

    1. Item 6: Clutch monitoring switch (upper)
    2. Item 7: Clutch interlock switch (bottom)
    3. Item 16: Atmospheric pressure <4N1>

Q. Are the check results normal?
Go to Step 6.
Perform the troubleshooting for the item that has an abnormal value (Refer to ).

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

  • Item 17: Vehicle speed
OK: 0 km/h (Vehicle: Stopped)

Q. Is the check result normal?
YES <4J1> : Go to Step 7.
YES <4N1> : Go to Step 8.
Perform the troubleshooting of the ASC-ECU (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).

STEP 7. 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 9.
Perform the troubleshooting of the engine coolant temperature sensor (Refer to GROUP 13C - Troubleshooting - Inspection Chart for Diagnosis Code ).

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

  • Check the data lists of the engine-ECU (Refer to GROUP 13D - Troubleshooting - Data List Reference Table ).
  • Item 7: 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 9.
Perform the troubleshooting of the engine coolant temperature sensor (Refer to GROUP 13D - Troubleshooting - Inspection Chart for Diagnosis Code ).

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 ).