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The hydraulic sensor is incorporated in the hydraulic unit. When the brake pedal is depressed,
the pressure sensor detects the brake pressure applied from the master cylinder, converts this
pressure into the voltage signal, and outputs it.
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When the pressure sensor output signal is not within the standard value range, ASC-ECU
outputs this diagnosis code.
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- Incorrect adjustment of brake pedal height
- Master cylinder malfunction
- Brake booster malfunction
- ASC-ECU malfunction
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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Refer to GROUP 35A - On-vehicle Service .
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Q.
Is the check result normal?
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Adjust the brake pedal, and then go to Step 3.
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Refer to GROUP 35A - On-vehicle Service .
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Q.
Is the check result normal?
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After replacing the brake booster, go to Step 4.
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Q.
Is the diagnosis code No. C121D set?
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This diagnosis is complete.
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