Inspection Procedure 34: Auto Stop & Go (AS&G) System Abnormal (Auto Start Carried Out Under Condition That Clutch Pedal Not Operated) <Vehicles with AS&G system>

COMMENTS ON TROUBLE SYMPTOM

The failed engine and the AS&G system malfunction can possibly cause this. The engine-ECU, however, can possibly carry out the forced auto start, depending on the vehicle status or the ambient conditions.

PROBABLE CAUSES

Failed engine coolant temperature sensor
Failed battery current sensor
Failed brake vacuum sensor
Failed clutch switch (A)
Open clutch switch (A) circuit, or harness damage, or connector damage
Failed AS&G system
Failed engine-ECU

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 Technical Information Manual)

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

Q. Is the diagnosis code set?

	Inspection chart for diagnosis code (Refer to ).

	Go to Step 3 .

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

Refer to Data List Reference Table .

Item No. 8: Engine coolant temperature sensor
Item No. 153: Clutch switch (A)
Item No. 159: Battery current sensor
Item No. 161: Brake vacuum sensor

Q. Are the check results normal?

	Go to Step 4 .

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 4. Check the trouble symptoms.

Q. Does trouble symptom persist?

	Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).