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- 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.
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- 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
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Carry out the following check.
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- Size check of wheels and tyres
- Tyre wear and deterioration statuses
- Check the tyre pressure.
note |
For the tyre pressure, refer to the tyre pressure label attached to the lower section
of driver’s side door striker.
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Q.
Is the check result normal?
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Correct the wheels and tyres in good condition. Then go to Step 9.
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Use M.U.T.-III to check the diagnosis code for the ASC system (Refer to ).
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Q.
Is the check result normal?
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Carry out the diagnosis for the diagnosis code (Refer to ).
Then go to Step 9.
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At the same time with the following checks, also check that no parts other than the genuine
parts are mounted.
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- 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 ).
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Q.
Is the check result normal?
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Repair or replace the part(s) having damage or other problems. Then go to Step
9.
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At the same time with the following checks, also check that no parts other than the genuine
parts are mounted.
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- 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 ).
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Q.
Is the check result normal?
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Repair or replace the part(s) having damage or other problems. Then go to Step
9.
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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>.)
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Q.
Is the check result normal?
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Remove the non-genuine electronic device or the wiring harness of non-genuine
electronic device. Then go to Step 9.
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Check the following data list (Refer to ).
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- 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 08: Lateral G-sensor
- Item 11: Steering angle sensor
- Item 12: Yaw rate sensor
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Q.
Is the check result normal?
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NO (Abnormality with items 01 to 04) : Check the installation status of corresponding wheel speed sensor (Refer to <Front> or <Rear>).
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NO (Abnormality with items 08, 12) : Check the installation status of hydraulic unit (integrated with ASC-ECU) (Refer
to ).
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NO (Abnormality with item 11) : Check the installation status of steering wheel sensor (Refer to ).
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Carry out the following actuator tests, and check if they work normally (Refer to ).
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- Item No. 01: FL wheel ABS
- Item No.02: FR wheel ABS
- Item No.03: RL wheel ABS
- Item No.04: RR wheel ABS
- Item No.05: FL wheel TCL
- Item No.06: FR wheel TCL
- Item No.07: RL wheel TCL
- Item No.08: RR wheel TCL
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Q.
Is the check result normal?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 9.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 9.
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Q.
Is the check result normal?
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This diagnosis is complete.
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