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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 brake pedal height
- Incorrect adjustment of the stop lamp switch
- 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 - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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Q.
Is diagnosis code No. C121D set?
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This diagnosis is complete.
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Refer to GROUP 35A - On-vehicle Service/Brake Pedal Check .
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Q.
Is the check result normal?
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Go to GROUP 35A - On-vehicle Service/Brake Pedal Check .
Then go to Step 7.
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Refer to GROUP 35A - On-vehicle Service/Brake Pedal Check .
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Q.
Is the check result normal?
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Install the stop lamp switch correctly, and then go to Step 7.
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Refer to GROUP 35A - On-vehicle Service/Brake Booster Operation Check .
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Q.
Is the check result normal?
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After replacing the brake booster, go to Step 7.
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Erase the diagnosis code.
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Q.
Is diagnosis code No.C121D set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 7.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
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Erase the diagnosis code.
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Q.
Is diagnosis code No.C121D set?
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This diagnosis is complete.
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