Lexus ES: Brake Pressure Sensor "A" Circuit Voltage Out of Range (C05401C,C054028,C054049)
DESCRIPTION
The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C05401C | Brake Pressure Sensor "A" Circuit Voltage Out of Range | The voltage of the master cylinder pressure sensor signal is less than 0.129 V or more than 3.29 V for 0.1 seconds or more. | Skid control ECU (brake actuator assembly) |
| C054028 | Brake Pressure Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure | When the stop light switch assembly is off, the zero point of the master cylinder pressure sensor is less than -1.5 MPa (-15.3 kgf/cm2, -218 psi) or more than 1.5 MPa (15.3 kgf/cm2, 218 psi). | Skid control ECU (brake actuator assembly) |
| C054049 | Brake Pressure Sensor "A" Internal Electronic Failure | An internal malfunction of the master cylinder pressure sensor is detected during the self test. | Skid control ECU (brake actuator assembly) |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | The voltage of the master cylinder pressure sensor signal is less than 0.129 V. | ○ | - |
| The voltage of the master cylinder pressure sensor signal is more than 3.29 V. | - | ○ | |
| Detection Time | 0.1 seconds or more. | 0.1 seconds or more. | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C054028| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | The stop light switch assembly is off. | ○ | ○ |
| Malfunction Status | The zero point of the master cylinder pressure sensor is less than -1.5 MPa (-15.3 kgf/cm2, -218 psi). | ○ | - |
| The zero point of the master cylinder pressure sensor is more than 1.5 MPa (15.3 kgf/cm2, 218 psi). | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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PROCEDURE
| 1. | REPLACE BRAKE ACTUATOR ASSEMBLY |
(a) Replace the skid control ECU (brake actuator assembly).
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
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