Lexus ES: Pressure Holding Solenoid Valve Learning Undone (C1349,C134A)
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) stores the individual characteristic of each holding solenoid built into the brake actuator assembly. Based on the stored information, the skid control ECU (brake booster with master cylinder assembly) calibrates the individual differences and controls systems.
The skid control ECU (brake booster with master cylinder assembly) receives the shift position P signal from the hybrid vehicle control ECU through the CAN communication system.
These DTCs are cleared when the ABS holding solenoid valve learning results are normal.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1349 | Pressure Holding Solenoid Valve Learning Undone | 1155 | The ABS holding solenoid valve learning value is not stored. | Perform ABS holding solenoid valve learning and check for DTCs. If no DTCs are output again, the valve is normal. | Only DTC C1349 (INF code 1155) is stored: Does not come on SAE Code C1349 is stored: Comes on |
|
| C134A | Pressure Holding Solenoid Valve Learning Malfunction | 1156 | The ABS holding solenoid valve learning value cannot be obtained. |
| Does not come on | Electronically controlled brake system DTC |
MONITOR DESCRIPTION
-
After any of the following situations, if learning of the ABS holding solenoid for one wheel or more is not stored and the vehicle is being driven at a certain speed or more, the skid control ECU (brake booster with master cylinder assembly) judges that the learning of the ABS holding solenoid valve is not performed and illuminates the MIL and stores this DTC.
- The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
- After the brake actuator assembly, brake pedal stroke sensor assembly or brake pedal is removed and installed or replaced, the zero point is cleared.
-
After any of the following situations, if learning of the ABS holding solenoid for one wheel or more has not been performed, or learning has been performed but no learning value was stored, the skid control ECU (brake booster with master cylinder assembly) judges that the learning of the ABS holding solenoid valve is not performed and illuminates the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights, blinks* the brake hold operated indicator light and stores this DTC.
- The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
-
After the brake actuator assembly, brake pedal stroke sensor assembly or brake pedal is removed and installed or replaced, the zero point is cleared.
HINT:
-
*: The brake hold switch (No. 3 combination switch assembly) is turned on under the following vehicle conditions.
-
Vehicle Conditions:
- The driver side door is closed.
- The driver side seat belt is fastened.
-
Vehicle Conditions:
- As the detection conditions slightly differ from SAE code C1349, the detection conditions for DTC C1349 (INF code 1155) is also provided.
-
*: The brake hold switch (No. 3 combination switch assembly) is turned on under the following vehicle conditions.
MONITOR STRATEGY
HINT:
SAE code only.
C1349| Related DTCs | C1349: ABS holding solenoid open current learning not complete |
| Required Sensors/Components(Main) | Skid control ECU (brake booster with master cylinder assembly) |
| Required Sensors/Components(Related) | Speed sensor |
| Frequency of Operation | Continuous |
| Duration | - |
| MIL Operation | Immediately |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
HINT:
SAE code only.
C1349| Monitor runs whenever the following DTCs are not stored | None |
| Vehicle speed | 40 km/h (25 mph) or more |
TYPICAL MALFUNCTION THRESHOLDS
HINT:
SAE code only.
C1349| ABS holding solenoid open current learning value | Not stored for 1 or more wheels |
COMPONENT OPERATING RANGE
HINT:
SAE code only.
C1349| ABS holding solenoid open current learning value | Stored for 4 wheels |
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.
- Drive the vehicle at a speed of 40 km/h (25 mph) or more for 1 second.
- 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) or brake actuator 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
HINT:
Before performing linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization, DTC C1203 will be output.
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 that DTCs other than C1345, C1349 and C1392 are not output.
Click here
OK:
DTCs other than C1345, C1349 and C1392 are not output.
| NG |  | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
| 2. | PERFORM AIR BLEEDING |
(a) Perform the air bleeding procedure in Bleed Brake System.
Click here
|
| 3. | PERFORM ABS HOLDING SOLENOID VALVE LEARNING |
(a) Turn the power switch off.
(b) Check and ensure the following conditions required for performing ABS holding solenoid valve learning and then perform ABS holding solenoid valve learning.
Click here
| Tester Display |
|---|
| ECB Utility |
- The auxiliary battery voltage is 11 to 15.5 V when the power switch is on (READY).
- The brake actuator assembly is not hot.
- The hybrid control system is not malfunctioning.
- The shift state indicator shows that the shift lever is in P.
- The READY light in the combination meter assembly is illuminated.
- The brake pedal is not depressed.
- The parking brake is released.
NOTICE:
Learning will be performed in the order of linear solenoid valve offset learning and then ABS holding solenoid valve learning.
|
| 4. | RECONFIRM 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 C1349 and C134A are not output. | A |
| DTCs C1349 and/or C134A are output. | B |
| A | | END |
|
| 5. | PERFORM ACTIVE TEST USING TECHSTREAM (ABS SOLENOID) |
(a) Select the Active Test on the Techstream.
Click here
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| ABS Solenoid (SRLH) | Holding solenoid valve (RLH) | Solenoid ON/OFF | - |
| ABS Solenoid (SRRH) | Holding solenoid valve (RRH) | Solenoid ON/OFF | - |
| ABS Solenoid (SFLH) | Holding solenoid valve (FLH) | Solenoid ON/OFF | - |
| ABS Solenoid (SFRH) | Holding solenoid valve (FRH) | Solenoid ON/OFF | - |
| Tester Display |
|---|
| ABS Solenoid (SRLH) |
| Tester Display |
|---|
| ABS Solenoid (SRRH) |
| Tester Display |
|---|
| ABS Solenoid (SFLH) |
| Tester Display |
|---|
| ABS Solenoid (SFRH) |
(b) Operate the SFRH (front right wheel holding solenoid valve), SFLH (front left wheel holding solenoid valve), SRRH (rear right wheel holding solenoid valve) and SRLH (rear left wheel holding solenoid valve) solenoids one by one. While operating each solenoid, depress the brake pedal, open the corresponding bleeder plug and check that brake fluid does not flow from the bleeder plug.
OK:
Brake fluid does not flow from the corresponding bleeder plug when the brake pedal is depressed when operating each solenoid.
(c) While not operating the SFRH (front right wheel holding solenoid valve), SFLH (front left wheel holding solenoid valve), SRRH (rear right wheel holding solenoid valve) and SRLH (rear left wheel holding solenoid valve) solenoids, depress the brake pedal, open each bleeder plug and check that brake fluid flows from each bleeder plug.
OK:
Brake fluid flows from each bleeder plug when not operating each solenoid and the brake pedal is depressed.
| OK | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG | | REPLACE BRAKE ACTUATOR ASSEMBLY |
READ NEXT:
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System Diagram
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