| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM10000000214PO |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C05A128; Brake Pressure Sensor "E" Signal Bias Level Out of Range / Zero Adjustment Failure; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
DTC |
C05A128 |
Brake Pressure Sensor "E" Signal Bias Level Out of Range / Zero Adjustment Failure |
DESCRIPTION
The servo pressure sensor detects and transmits the servo pressure adjusted by the regulator to the No. 1 skid control ECU (brake booster with master cylinder assembly) in accordance with the vehicle condition.
HINT:
Brake pressure sensor "E": Servo pressure sensor
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Note |
|---|---|---|---|---|---|
|
C05A128 |
Brake Pressure Sensor "E" Signal Bias Level Out of Range / Zero Adjustment Failure |
When the brake pedal is not depressed, the servo pressure sensor output value is -0.63 MPa (-6.4 kgf/cm2, -91.4 psi) or less or 1.53 MPa (15.6 kgf/cm2, 222 psi) or more for 3 seconds or more. |
No. 1 skid control ECU (brake booster with master cylinder assembly) |
Comes on |
|
C05A128 DTC Detection Conditions
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
When the brake pedal is not depressed |
○ |
○ |
|
Malfunction Status |
The servo pressure sensor output value is -0.63 MPa (-6.4 kgf/cm2, -91.4 psi) or less |
○ |
- |
|
The servo pressure sensor output value is 1.53 MPa (15.6 kgf/cm2, 222 psi) or more |
- |
○ |
|
|
Detection Time |
3 seconds or more. |
3 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.
MONITOR DESCRIPTION
When the brake pedal is not operated and the servo pressure sensor output value exceeds a specific value, or the value is less than a specific value for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that the zero point of the servo pressure sensor is abnormal and illuminates the MIL and stores this DTC.
MONITOR STRATEGY
|
Related DTCs |
C05A2: Servo pressure sensor exceeded learning limit |
|
Required Sensors/Components(Main) |
Brake actuator (brake booster with master cylinder assembly) |
|
Required Sensors/Components(Related) |
Brake pedal stroke sensor assembly Brake actuator (brake booster with master cylinder assembly) Stop light switch assembly |
|
Frequency of Operation |
Continuous |
|
Duration |
3 seconds |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
| *: Electronically Controlled Brake System | |
|
Monitor runs whenever the following DTCs are not stored |
C0577 (Case 1): Reaction force pressure sensor lost communication C0577 (Case 2): Reaction force pressure sensor internal malfunction C0577 (Case 3): Reaction force pressure sensor invalid data C0578: Reaction force pressure sensor exceeded learning limit C05A1 (Case 1): Servo pressure sensor lost communication C05A1 (Case 2): Servo pressure sensor internal malfunction C05A1 (Case 3): Servo pressure sensor invalid data C1100 (Case 1): Brake pedal position sensor voltage circuit/open C1100 (Case 2): Brake pedal position sensor invalid data C1103 (Case 1): Brake pedal position sensor voltage circuit/open C1103 (Case 2): Brake pedal position sensor invalid data C1496: Reaction force pressure sensor voltage circuit low C1497: Reaction force pressure sensor voltage circuit high C1498: Servo pressure sensor voltage circuit low C1499: Servo pressure sensor voltage circuit high C14B4: Reaction force pressure sensor intermittent/erratic C14C4: Servo pressure sensor intermittent/erratic P057A: Brake pedal position sensor invalid data P057C: Brake pedal position sensor open circuit P057D: Brake pedal position sensor circuit high P057E: Brake pedal position sensor intermittent/erratic P05DB: Brake pedal position sensor invalid data P05DD: Brake pedal position sensor open circuit P05DE: Brake pedal position sensor circuit high P05DF: Brake pedal position sensor intermittent/erratic P05E0: Brake pedal position sensor "A"/"B" correlation U0129: Lost communication with ECB*_ECU (C-bus) |
|
All of the following conditions are met |
- |
|
Servo pressure sensor circuit fail |
Not detected |
|
Brake position sensor circuit fail |
Not detected |
|
Reaction force pressure sensor circuit fail |
Not detected |
|
Brake |
Off |
TYPICAL MALFUNCTION THRESHOLDS
|
Servo pressure sensor |
Less than -0.63 MPa (-6.4 kgf/cm2, -91.4 psi), or higher than 1.53 MPa (15.6 kgf/cm2, 222 psi) |
COMPONENT OPERATING RANGE
|
All of the following conditions are met |
- |
|
Servo pressure sensor circuit fail |
Not detected |
|
Brake position sensor circuit fail |
Not detected |
|
Reaction force pressure sensor circuit fail |
Not detected |
|
Brake |
Off |
|
Servo pressure sensor |
-0.63 MPa (-6.4 kgf/cm2, -91.4 psi) or more, and 1.53 MPa (15.6 kgf/cm2, 222 psi) or less |
CONFIRMATION DRIVING PATTERN
NOTICE:
When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.
HINT:
- After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off.
- Turn the ignition switch to ON (READY) and turn the GTS on.
-
Wait for 3 seconds or more. [*]
HINT:
[*]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Chassis / Brake/EPB / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".
Click here
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PROCEDURE
|
1. |
CHECK BRAKE PEDAL |
(a) Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.
(b) Check and adjust the brake pedal height.
Click here
(c) Adjust the brake pedal stroke sensor assembly.
Click here
|
|
2. |
READ VALUE USING GTS (SERVO PRESSURE) |
(a) Check that the servo pressure sensor output value is within 0.00 to 1.53 MPa when the brake pedal not depressed.
Chassis > Brake Booster > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Servo Pressure |
Pressure value of servo |
Min.: 0.00 MPa Max.: 24.48 MPa |
Brake pedal released: 0.00 to 1.53 MPa |
Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal |
Chassis > Brake Booster > Data List
|
Tester Display |
|---|
|
Servo Pressure |
OK:
The servo pressure sensor output value is within 0.00 to 1.53 MPa.
HINT:
If the servo pressure sensor output value is within 0.00 to 1.53 MPa, the No. 1 skid control ECU (brake booster with master cylinder assembly) automatically performs zero point calibration every time the ignition switch is turned to ON.
Therefore, if the servo pressure sensor output value is not within 0.00 to 1.53 MPa, replace the No. 1 skid control ECU (brake booster with master cylinder assembly) with a new one.
| NG |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
|
3. |
CLEAR DTC |
(a) Clear the DTCs.
Chassis > Brake Booster > Clear DTCs
(b) Turn the ignition switch off.
|
|
4. |
RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Check if the same DTC is output.
Chassis > Brake Booster > Trouble Codes
HINT:
Even if the DTC is cleared, it will immediately be output again if the servo pressure sensor zero point malfunction remains.
|
Result |
Proceed to |
|---|---|
|
DTC C05A128 is not output. |
A |
|
DTC C05A128 is output. |
B |
| A |
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
|