[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
35 -SERVICE BRAKES > 35C-ACTIVE STABILITY CONTROL SYSTEM (ASC) > TROUBLESHOOTING<ASC-ECU><ASC-ECU> > SYMPTOM PROCEDURES > ABS/STABILITY CONTROL/TCL OPERATES TOO FREQUENTLY.
Inspection Procedure 13: ABS/stability control/TCL operates too frequently.
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
  • Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnosis code is not detected.
  • If wheels and tyres other than the ones with genuine specified size are mounted, the ABS/stability control/TCL may be activated prematurely.
  • If a non-genuine braking device or non-genuine impact reduction device is mounted, the ABS/stability control/TCL may be activated prematurely.
 
 
 
PROBABLE CAUSES
  • Mounting of wheels and tyres other than with genuine specified size
  • Tyre pressure abnormality
  • Tyre wear and deterioration
  • Mounting of non-genuine braking device or impact reduction device
  • Wheel alignment abnormality
  • Malfunction of brake related parts
  • Malfunction of the wheel speed sensor
  • Steering wheel sensor malfunction
  • Malfunction of hydraulic unit (integrated with ASC-ECU)
  • Malfunction of hydraulic circuit
  • External radio wave noise interference
 
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check the wheels and the tyres.
Carry out the following check.
  • Size check of wheels and tyres
  • Tyre wear and deterioration statuses
  • Check the tyre pressure.
    noteFor the tyre pressure, refer to the tyre pressure label attached to the lower section of driver's side door striker.
Is the check result normal?
Go to Step 2
Correct the wheels and tyres in good condition.
 
STEP 2. Diagnosis code check
Use M.U.T.-IIISE to check the diagnosis code for the ASC system (Refer to ).
Is the check result normal?
Go to Step 3
Carry out the diagnosis for the diagnosis code (Refer to ).
 
STEP 3. Check of brake system related components other than hydraulic unit (integrated with ASC-ECU)
At the same time with the following checks, also check that no parts other than the genuine parts are mounted.
  • Brake pad check (Refer to GROUP 35A - On-vehicle Service/Brake Pad Check ).
  • Brake disc runout check (Refer to GROUP 35A - On-vehicle Service/Brake Disk Check ).
  • Brake drag force check (Refer to GROUP 35A - On-vehicle Service/Brake Drag Force Check ).
Is the check result normal?
Go to Step 4
Repair or replace the part(s) having damage or other problems.
 
STEP 4. Wheel alignment check
At the same time with the following checks, also check that no parts other than the genuine parts are mounted.
  • Front wheel alignment check (Refer to GROUP 33 - On-vehicle Service/Front Wheel Alignment Check and Adjustment ).
  • Rear wheel alignment check (Refer to GROUP 34 - On-vehicle Service/Rear Wheel Alignment Check and Adjustment ).
Is the check result normal?
Go to Step 5
Repair or replace the part(s) having damage or other problems.
 
STEP 5. Wheel speed sensor check
Check that no non-genuine electronic device or no wiring harness of other than genuine electronic device is mounted near the wheel speed sensor (at wheel speed detection section and wiring harness section) (Refer to <Front> or <Rear>.)
Is the check result normal?
Go to Step 6
Remove the non-genuine electronic device or the wiring harness of non-genuine electronic device.
 
STEP 6. M.U.T.-IIISE data list
Check the following data list (Refer to ).
  • Item 01: FL wheel speed sensor
  • Item 02: FR wheel speed sensor
  • Item 03: RL wheel speed sensor
  • Item 04: RR wheel speed sensor
  • Item 05: Steering angle sensor
  • Item 06: Yaw rate sensor
  • Item 08: Lateral G-sensor
Is the check result normal?
Go to Step 7
NO (Abnormality with items 01 to 04) : Check the installation status of corresponding wheel speed sensor (Refer to <Front> or <Rear>).
NO (Abnormality with items 06, 08) : Check the installation status of hydraulic unit (integrated with ASC-ECU) (Refer to ).
NO (Abnormality with item 05) : Check the installation status of steering wheel sensor (Refer to ).
 
STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if they work normally (Refer to ).
  • Item No.01: FR wheel ABS
  • Item No.02: FL wheel ABS
  • Item No.03: RR wheel ABS
  • Item No.04: RL wheel ABS
  • Item No.05: FR wheel TCL
  • Item No.06: FL wheel TCL
  • Item No.07: RR wheel TCL
  • Item No.08: RL wheel TCL
Is the check result normal?
Go to Step 8
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
 
STEP 8. ABS/stability control/TCL operation check
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).