DTC C1246/46: Master Cylinder Pressure Sensor Malfunction; DTC C1281/81: Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC); DTC C1364/61: Wheel Cylinder Pressure Sensor Malfunction [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
The regulator pressure sensor and wheel cylinder pressure sensor are built into the brake actuator. They measure their respective pressures and send signals to the skid control ECU (brake booster with master cylinder assembly).
DTC C1281/81 will be cleared when the regulator pressure sensor sends a regulator pressure signal or when Test Mode ends. DTC C1281/81 is output only in Test Mode.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1246/46 | 201 | Sensor supply voltage (VCM1) is 4.75 V or less, or 5.25 V or more for 0.05 seconds. | Brake booster with master cylinder assembly |
| ↑ | 202 | Regulator pressure sensor output voltage (Preg) is less than 8%, or 90.3% or more (less than 0.4 V, or 4.52 V or more) of sensor supply voltage (VCM1) for 0.05 seconds or more. | ↑ |
| ↑ | 203 | When not under braking, the regulator pressure sensor output voltage is 0.2 V or less or 0.88 V or more for 3 seconds or more. | ↑ |
| ↑ | 204 | Either of the following is detected:
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| ↑ | 207 | Fluctuation of regulator pressure sensor output is out of specification (the difference between the present value and last value is 15 MPa (153.0 kgf/cm2 , 2176 psi) or more) for 0.1 seconds or more. | Brake booster with master cylinder assembly |
| C1364/61 | 421 | Sensor supply voltage 1 (VCM1) is 4.75 V or less, or 5.25 V or more for 0.05 seconds or more. | Brake booster with master cylinder assembly |
| ↑ | 422 | Wheel cylinder pressure sensor output voltage (Pfront) is less than 8%, or 90.3% or more (less than 0.4 V, or 4.52 V or more) of sensor supply voltage (VCM1) for 0.05 seconds or more. | ↑ |
| ↑ | 423 | When not under braking, the wheel cylinder pressure sensor output voltage is 0.2 V or less or 0.88 V or more for 0.1 to 3 seconds or more. | ↑ |
| ↑ | 424 | The wheel cylinder pressure sensor output voltage does not correspond with regulator pressure sensor and the outputs remain out of specification for 0.5 to 5 seconds or more continuously. (May be output with INF code 204.) |
↑ |
| ↑ | 426 | Fluctuation of wheel cylinder pressure sensor output is out of specification (the difference between the present value and last value is 15 MPa (153.0 kgf/cm2 , 2176 psi) or more) for 0.1 seconds or more. | ↑ |
| C1281/81 | - | Detected only during Test Mode. |
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