Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C122D14 | Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open | Master cylinder pressure sensor power supply voltage decrease occurs or history of voltage decrease exists, and defective master cylinder pressure sensor output continues for 1.2 seconds or more. |
|
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (+BS TERMINAL) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A41-14 (+BS) - Body ground | Always | 11 to 14 V |
| A41-14 (+BS) -A41-1 (GND1) | Always | 11 to 14 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CLEAR DTC |
(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Clear DTCs(e) Press the DTC clear button.
(f) Turn the engine switch off.
|
| 3. | RECONFIRM DTC |
(a) Turn the engine switch on (IG).
(b) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Trouble Codes(c) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| DTC C122D14 is not output. | A |
| DTC C122D14 is output. | B |
| A | | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE BRAKE ACTUATOR ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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