Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Linear Solenoid Valve Offset Learning undone (C1345,C1368)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) stores the individual characteristics of each linear solenoid built into the brake booster with master cylinder 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 linear solenoid valve offset learning results are normal.

MONITOR DESCRIPTION

• After any of the following situations, if the learning value of the linear solenoid (SLA) or linear solenoid (SLR) 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 offset learning of the linear solenoid valve is not performed and illuminates the MIL and stores this DTC.
  1. The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
  2. 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 linear solenoid (SLA) or linear solenoid (SLR) 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 offset learning of the linear 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.
  1. The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
  2. 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 (electric parking brake switch assembly) is turned on under the following vehicle conditions.
       • Vehicle Conditions:
         1. The driver side door is closed.
         2. The driver side seat belt is fastened.
     • As the detection conditions slightly differ from SAE code C1345, the detection conditions for DTC C1345 (INF code 1133) is also provided.

MONITOR STRATEGY

HINT:

SAE code only.

TYPICAL ENABLING CONDITIONS

HINT:

SAE code only.

TYPICAL MALFUNCTION THRESHOLDS

HINT:

SAE code only.

COMPONENT OPERATING RANGE

HINT:

SAE code only.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the power switch off.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Drive the vehicle at a speed of 40 km/h (25 mph) or more for 1 second.
9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    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

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

(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

OK

(a) Perform the air bleeding procedure in Bleed Brake System.

Click here

NEXT

(a) Turn the power switch off.

(b) Check and ensure the following conditions required for performing linear solenoid valve offset learning and then perform linear solenoid valve offset learning.

Click here

1. The auxiliary battery voltage is 11 to 15.5 V when the power switch is on (READY).
2. The brake actuator (brake booster with master cylinder assembly) is not hot.
3. The hybrid control system is not malfunctioning.
4. The shift state indicator shows that the shift lever is in P.
5. The READY light in the combination meter assembly is illuminated.
6. The brake pedal is not depressed.
7. The parking brake is released.
8. DTC C1451 (Motor Drive Permission Malfunction) is not output. (If it is output, bleed the air from the high-pressure tube.)

NEXT

(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

A

END

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY