Lexus ES: Reaction Force Pressure Sensor Power Supply Voltage Malfunction (C14B0,...,C14D4)
DESCRIPTION
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C14B0 | Reaction Force Pressure Sensor Power Supply Voltage Malfunction | 201 | The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14B1 | Reaction Force Pressure Sensor Communication Malfunction | 202 | Communication with the sensor is invalid for 0.05 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14B2 | Reaction Force Pressure Sensor Internal Malfunction | 203 | A malfunction is detected by self-diagnosis function of the sensor. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14B4 | Reaction Force Pressure Sensor Output Malfunction | 207 | Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm2, 1088 psi) or more from the previous value) for 0.1 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14B5 | Reaction Force Pressure Sensor Data Invalid | 208 | Data from the sensor is invalid for 0.2 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14C0 | Servo Pressure Sensor Power Supply Voltage Malfunction | 421 | The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14C1 | Servo Pressure Sensor Communication Malfunction | 422 | Communication with the sensor is invalid for 0.05 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14C2 | Servo Pressure Sensor Internal Malfunction | 423 | A malfunction is detected by self-diagnosis function of the sensor. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14C4 | Servo Pressure Sensor Output Malfunction | 426 | Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm2, 1088 psi) or more from the previous value) for 0.1 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14C5 | Servo Pressure Sensor Data Invalid | 427 | Data from the sensor is invalid for 0.2 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14D0 | Accumulator Pressure Sensor Power Supply Voltage Malfunction | 331 | The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14D1 | Accumulator Pressure Sensor Communication Malfunction | 332 | Communication with the sensor is invalid for 0.2 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14D2 | Accumulator Pressure Sensor Internal Malfunction | 335 | A malfunction is detected by self-diagnosis function of the sensor. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14D3 | Accumulator Pressure Sensor Output Malfunction | 333 | Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm2, 1088 psi) or more from the previous value) for 0.1 seconds or more. | Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
| C14D4 | Accumulator Pressure Sensor Data Invalid | 336 337 |
| Skid control ECU (brake booster with master cylinder assembly) | Comes on |
|
MONITOR DESCRIPTION
- When the supply voltage to a brake fluid pressure sensor is outside of the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the supply voltage to the sensor is abnormal and illuminates the MIL and stores a DTC.
- When an invalid serial communication signal is detected, the skid control ECU (brake booster with master cylinder assembly) judges that communication is abnormal and illuminates the MIL and stores a DTC.
- When the pressure or temperature of a brake fluid pressure sensor exceeds a certain value, the skid control ECU (brake booster with master cylinder assembly) judges that the internal data is abnormal and illuminates the MIL and stores a DTC.
- When the difference between the present output of a brake fluid pressure sensor and the previous output of a brake fluid pressure sensor becomes considerably large, the skid control ECU (brake booster with master cylinder assembly) judges that the sensor output is abnormal and illuminates the MIL and stores a DTC.
-
When the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) judges that the data from a brake fluid pressure sensor is invalid and illuminates the MIL and stores a DTC.
- Brake fluid pressure sensor related DTCs (DTC C14B0, C14B1, C14B2, C14B4, C14C0, C14C1, C14C2, C14C4, C14D0, C14D1, C14D2 and C14D3) are not stored.
- When related malfunction DTCs are not stored, the skid control ECU (brake booster with master cylinder assembly) detects a brake fluid pressure sensor malfunction.
- When the accumulator pressure sensor data is abnormal or there is a communication error, before the accumulator pressure sensor is judged to be malfunctioning (C14D0, C14D1 or C14D2), a reset of the timer which is used for detection timing, etc., may be performed by the IC. If this situation repeats consecutively, the skid control ECU (brake booster with master cylinder assembly) judges that the accumulator pressure sensor reset is abnormal and illuminates the MIL and stores a DTC.
MONITOR STRATEGY
| Related DTCs | C14B0: Reaction force pressure sensor voltage circuit check C14B1: Reaction force pressure sensor lost communication C14B2: Reaction force pressure sensor internal malfunction C14B4: Reaction force pressure sensor intermittent/erratic C14B5: Reaction force pressure sensor invalid data C14C0: Servo pressure sensor voltage circuit check C14C1: Servo pressure sensor lost communication C14C2: Servo pressure sensor internal malfunction C14C4: Servo pressure sensor intermittent/erratic C14C5: Servo pressure sensor invalid data C14D0: Accumulator pressure sensor voltage circuit check C14D1: Accumulator pressure sensor lost communication C14D2: Accumulator pressure sensor internal malfunction C14D3: Accumulator pressure sensor intermittent/erratic C14D4 (Case 1): Accumulator pressure sensor invalid data C14D4 (Case 2): Accumulator pressure sensor intermittent |
| Required Sensors/Components(Main) | Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly) |
| Required Sensors/Components(Related) | Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly) |
| Frequency of Operation | Continuous |
| Duration | Within 1 second: C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and C14D4 (Case 1) 2 times: C14D4 (Case 2) |
| MIL Operation | Immediately |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
C14B0| Monitor runs whenever the following DTCs are not stored | None |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Monitor runs whenever the following DTCs are not stored | None |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Monitor runs whenever the following DTCs are not stored | None |
| Both of the following conditions are met | - |
| Lost communication with reaction force pressure sensor | Not detected |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Monitor runs whenever the following DTCs are not stored | C14B0 (Reaction force pressure sensor voltage circuit check) C14B1 (Reaction force pressure sensor lost communication) C14B2 (Reaction force pressure sensor internal malfunction) C14B4 (Reaction force pressure sensor intermittent/erratic) |
| All of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Serial communication with high side IC | Valid |
| Reaction force pressure sensor fail (C14B0, C14B1, C14B2, C14B4) | Not detected |
| Monitor runs whenever the following DTCs are not stored | None |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Monitor runs whenever the following DTCs are not stored | None |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Monitor runs whenever the following DTCs are not stored | None |
| Both of the following conditions are met | - |
| Lost communication with servo pressure sensor | Not detected |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Monitor runs whenever the following DTCs are not stored | C14C0 (Servo pressure sensor voltage circuit check) C14C1 (Servo pressure sensor lost communication) C14C2 (Servo pressure sensor internal malfunction) C14C4 (Servo pressure sensor intermittent/erratic) |
| All of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Serial communication with high side IC | Valid |
| Servo pressure sensor fail (C14C0, C14C1, C14C2, C14C4) | Not detected |
| Monitor runs whenever the following DTCs are not stored | C14D4 (Case 2) (Accumulator pressure sensor intermittent) |
| Both of the following conditions are met | - |
| Brake system voltage 2 (VM2) | Higher than 8.27 V |
| Accumulator pressure sensor fail (C14D4 (Case 2)) | Not detected |
| Monitor runs whenever the following DTCs are not stored | C14D4 (Case 2) (Accumulator pressure sensor intermittent) |
| Both of the following conditions are met | - |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Accumulator pressure sensor fail (C14D4 (Case 2)) | Not detected |
| Monitor runs whenever the following DTCs are not stored | C14D4 (Case 2) (Accumulator pressure sensor intermittent) |
| All of the following conditions are met | - |
| Lost communication with accumulator pressure sensor | Not detected |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Accumulator pressure sensor fail (C14D4 (Case 2)) | Not detected |
| Monitor runs whenever the following DTCs are not stored | None |
| Both of the following conditions are met | - |
| Lost communication with accumulator pressure sensor | Not detected |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Monitor runs whenever the following DTCs are not stored | C14D0 (Accumulator pressure sensor voltage circuit check) C14D1 (Accumulator pressure sensor lost communication) C14D2 (Accumulator pressure sensor internal malfunction) C14D3 (Accumulator pressure sensor intermittent/erratic) C14D4 (Case 2) (Accumulator pressure sensor intermittent) |
| Both of the following conditions are met | - |
| Brake system voltage 2 (VM2) | Higher than 8.27 V |
| Accumulator pressure sensor fail (C14D0, C14D1, C14D2, C14D3, C14D4 (Case 2)) | Not detected |
| Monitor runs whenever the following DTCs are not stored | C14D0 (Accumulator pressure sensor voltage circuit check) C14D1 (Accumulator pressure sensor lost communication) C14D2 (Accumulator pressure sensor internal malfunction) |
| Both of the following conditions are met | - |
| Serial communication with low side IC | Valid |
| Accumulator pressure sensor fail (C14D0, C14D1, C14D2) | Not detected |
TYPICAL MALFUNCTION THRESHOLDS
C14B0| Power supply for reaction force pressure sensor | Less than 6.3 V, or higher than 7.64 V |
| Lost communication with reaction force pressure sensor | Detected |
| Either of the following conditions is met | - |
| Reaction force pressure sensor value | Higher than 23.328 MPa (237.9 kgf/cm2, 3384 psi) |
| Reaction force pressure temp sensor value | Higher than 150°C (302°F) |
| Difference between present reaction force pressure and previous reaction force pressure | Higher than 7.5 MPa (76.5 kgf/cm2, 1088 psi) |
| Reaction force pressure sensor data | Invalid |
| Power supply for servo pressure sensor | Less than 6.3 V, or higher than 7.64 V |
| Lost communication with servo pressure sensor | Detected |
| Either of the following conditions is met | - |
| Servo pressure sensor value | Higher than 23.328 MPa (237.9 kgf/cm2, 3384 psi) |
| Servo pressure temp sensor value | Higher than 150°C (302°F) |
| Difference between present servo pressure and previous servo pressure | Higher than 7.5 MPa (76.5 kgf/cm2, 1088 psi) |
| Servo pressure sensor data | Invalid |
| Power supply for accumulator pressure sensor | Less than 6.29 V, or higher than 7.64 V |
| Lost communication with accumulator pressure sensor | Detected |
| Either of the following conditions is met | - |
| Accumulator pressure sensor value | Higher than 23.328 MPa (237.9 kgf/cm2, 3384 psi) |
| Accumulator pressure temp sensor value | Higher than 150°C (302°F) |
| Difference between present accumulator pressure and previous accumulator pressure | Higher than 7.5 MPa (76.5 kgf/cm2, 1088 psi) |
| Accumulator pressure sensor data | Invalid |
| Accumulator pressure sensor IC is reset within less than 0.102 seconds | Met |
COMPONENT OPERATING RANGE
C14B0| Both of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Both of the following conditions are met | - |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Lost communication with reaction force pressure sensor | Not detected |
| All of the following conditions are met | - |
| Lost communication with reaction force pressure sensor | Not detected |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Reaction force pressure sensor value | 23.328 MPa (237.9 kgf/cm2, 3384 psi) or less |
| Reaction force pressure temp sensor value | 150°C (302°F) or less |
| All of the following conditions are met | - |
| Lost communication with reaction force pressure sensor | Not detected |
| Power supply for reaction force pressure sensor | 6.3 V or more, and 7.64 V or less |
| Difference between present reaction force pressure and previous reaction force pressure | 7.5 MPa (76.5 kgf/cm2, 1088 psi) or less |
| Both of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Reaction force pressure sensor data | Valid |
| Both of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Both of the following conditions are met | - |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Lost communication with servo pressure sensor | Not detected |
| All of the following conditions are met | - |
| Lost communication with servo pressure sensor | Not detected |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Servo pressure sensor value | 23.328 MPa (237.9 kgf/cm2, 3384 psi) or less |
| Servo pressure temp sensor value | 150°C (302°F) or less |
| All of the following conditions are met | - |
| Lost communication with servo pressure sensor | Not detected |
| Power supply for servo pressure sensor | 6.3 V or more, and 7.64 V or less |
| Difference between present servo pressure and previous servo pressure | 7.5 MPa (76.5 kgf/cm2, 1088 psi) or less |
| Both of the following conditions are met | - |
| Brake system voltage 1 (VM1) | Higher than 8.27 V |
| Servo pressure sensor data | Valid |
| All of the following conditions are met | - |
| Brake system voltage 2 (VM2) | Higher than 8.27 V |
| Accumulator pressure sensor fail (C14D4 (Case 2)) | Not detected |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Both of the following conditions are met | - |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Lost communication with accumulator pressure sensor | Not detected |
| All of the following conditions are met | - |
| Lost communication with accumulator pressure sensor | Not detected |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Accumulator pressure sensor fail (C14D4 (Case 2)) | Not detected |
| Accumulator pressure sensor value | 23.328 MPa (237.9 kgf/cm2, 3384 psi) or less |
| Accumulator pressure temp sensor value | 150°C (302°F) or less |
| All of the following conditions are met | - |
| Lost communication with accumulator pressure sensor | Not detected |
| Power supply for accumulator pressure sensor | 6.29 V or more, and 7.64 V or less |
| Difference between present accumulator pressure and previous accumulator pressure | 7.5 MPa (76.5 kgf/cm2, 1088 psi) or less |
| Both of the following conditions are met | - |
| Brake system voltage 2 (VM2) | Higher than 8.27 V |
| Accumulator pressure sensor data | Valid |
| All of the following conditions are met | - |
| Serial communication with low side IC | Valid |
| The order that prohibit pump motor operating from IC | Off |
| Accumulator pressure sensor IC reset | Does not occur |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
-
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
-
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here
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HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
PROCEDURE
| 1. | CHECK DTC |
(a) Clear the DTCs.
Click here
(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is output.
Click here
| Result | Proceed to |
|---|---|
| DTCs C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and/or C14D4 are output. | A |
| DTCs C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and C14D4 are not output. | B |
| A |  | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| B | | USE SIMULATION METHOD TO CHECK |
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