Toyota Yaris: Vehicle Stability Control System / Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| 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. |
| Brake |
WIRING DIAGRAM
Refer to DTC C137BA2.
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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 A108 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 |
|---|---|---|
| A108-38 (+BS) - Body ground | Always | 11 to 14 V |
| A108-38 (+BS) - A108-25 (GND1) | Always | 11 to 14 V |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 2. | CLEAR DTC |
(a) Reconnect the A108 skid control ECU (brake actuator assembly) connector.
(b) Operate the GTS to clear the codes.
Chassis > Brake > Clear DTCs(c) Press the DTC clear button.
(d) Turn the ignition switch off.
|
| 3. | RECONFIRM DTC |
(a) Operate the GTS to read the DTCs.
Chassis > Brake > Trouble Codes(b) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C122D14 is not output | A |
| C122D14 is output | B |
| A |
 | USE SIMULATION METHOD TO CHECK |
| B |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)
DESCRIPTION The solenoid relay and solenoid valves are built into the brake actuator assembly. The solenoid valves control the brake fluid pressure at each wheel cylinder...
ECM Communication (C124A00)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from C124A00 ECM Communication Any of the following is detected:
The engine type, powertrain variation, engine stop and start ECU availability and destination information sent from the ECM do not match the information stored in the skid control ECU (brake actuator assembly)...
Other information:
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Diagnosis System
DIAGNOSIS SYSTEM FUNCTION OF WARNING INDICATOR AND MESSAGE (a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message is displayed on the multi-information display. Warning Message Detail DTC/RoB PCS warning light "Pre-Collision System Malfunction Visit Your Dealer" Pre-collision system malfunctioning Stored Illuminates "Pre-Collision System Radar In Self Calibration Unavailable See Owner's Manual" Millimeter wave radar sensor assembly misaligned Stored Illuminates "Pre-Collision System Out of Temperature Range Unavailable See Owner's Manual" Millimeter wave radar sensor assembly temperature malfunction Stored Illuminates "Pre-Collision System Unavailable See Owner's Manual" Millimeter wave radar sensor assembly voltage malfunction Determination was made for temporary suspension of system operation due to millimeter wave radar sensor assembly detecting interference from other nearby radar emitters Stored Illuminates "Pre-Collision System Radar Sensor Blocked Unavailable Clean Radar Sensor" Foreign matter attached to millimeter wave radar sensor assembly Stored Illuminates "Front Camera Unavailable See Owner's Manual" Abnormal forward recognition camera voltage Stored Illuminates "Front Camera Out of Temperature Range Unavailable Wait until Normal Temperature" Forward recognition camera temperature outside of operational range Stored Illuminates "Front Camera Low Visibility Unavailable See Owner's Manual" Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera Forward recognition camera or area of windshield in front of forward recognition camera is fogged up Stored Illuminates "VSC Turned Off Pre-Collision Brake System Unavailable" VSC system is disabled Not stored Illuminates PCS Warning Light Illumination Status PCS Warning Light Condition Illuminates Pre-collision system malfunctioning Pre-collision system temporarily disabled During pre-collision system radar alignment Pre-collision system disabled VSC system disabled Not illuminated Other INITIAL CHECK (a) An initial check is performed when the ignition switch is off for more than 2 seconds and then turned ON...
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Components
COMPONENTS ILLUSTRATION *1 OUTPUT SHAFT BEARING SHAFT SNAP RING *2 NEEDLE ROLLER BEARING *3 SYNCHRONIZER SHIFTING KEY SPRING *4 SHAFT SNAP RING *5 SPACER *6 BALL *7 OUTPUT SHAFT FRONT BEARING INNER RACE *8 SYNCHROMESH SHIFTING KEY BALL *9 NO...
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Front Seat Belt Pretensioners
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.
