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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.
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- Hydraulic unit (Integrated with ASC-ECU) malfunction
- Malfunction of hydraulic circuit
- Malfunction of brake assembly
- Malfunction of brake booster
- Malfunction of master cylinder assembly
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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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Troubleshoot for the relevant diagnosis code (Refer to ).
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Check that the brake tube is installed to the hydraulic unit (integrated with ASC-ECU)
correctly (Refer to ).
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Q.
Is the check result normal?
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Connect the brake tubes correctly, repair the external brake lines, or replace
the hydraulic unit (integrated with ASC-ECU) (Refer to ).
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Perform the following checks.
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- Brake pedal check (Refer to GROUP 35A - On-vehicle Service/Brake
Pedal Check and Adjustment ).
- Brake booster check (Refer to GROUP 35A - On-vehicle Service/Brake
Booster Operating Check ).
- Check valve check (Refer to GROUP 35A - On-vehicle Service/Check
Valve Operation Check ).
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Q.
Can any fault be found with the brake operation?
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Check the brake-related parts, and repair if necessary. Then, go to Step 4.
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Perform the following actuator tests (Refer to ).
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- Item No.01: FL wheel ABS drive
- Item No.02: FR wheel ABS drive
- Item No.03: RL wheel ABS drive
- Item No.04: RR wheel ABS drive
- Item No.05: FL wheel TCL drive
- Item No.06: FR wheel TCL drive
- Item No.07: RL wheel TCL drive
- Item No.08: RR wheel TCL drive
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Q.
Is the check result normal?
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This diagnosis is complete.
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
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