BRAKE PEDAL-TO-FLOOR CLEARANCE IS LOWER THAN STANDARD (NO BRAKE FLUID LEAKAGE AND TRAPPED AIR) [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

id040309071100

Outline

Description

Brake pedal-to-floor clearance is lower than standard (no brake fluid leakage and trapped air)

Possible cause

•  Electronically controlled brake unit detects malfunction (input/output device malfunction)

•  Stroke simulator malfunction

•  Stroke sensor malfunction

•  Linear actuator malfunction

Note

•  If a malfunction occurs in the electronically controlled brake unit and the switching solenoid valve operation is inhibited, the brake pedal operation feel may change and worsened braking performance may be felt.

•  The stroke simulator, stroke sensor, and the linear actuator are integrated in the electronically controlled brake unit.

System wiring diagram

Not applicable

Connector diagram

Not applicable

Description	Brake pedal-to-floor clearance is lower than standard (no brake fluid leakage and trapped air)
Possible cause	• Electronically controlled brake unit detects malfunction (input/output device malfunction) • Stroke simulator malfunction • Stroke sensor malfunction • Linear actuator malfunction Note • If a malfunction occurs in the electronically controlled brake unit and the switching solenoid valve operation is inhibited, the brake pedal operation feel may change and worsened braking performance may be felt. • The stroke simulator, stroke sensor, and the linear actuator are integrated in the electronically controlled brake unit.
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

CONFIRM ELECTRONICALLY CONTROLLED BRAKE UNIT DTC

•  Retrieve the electronically controlled brake unit DTC using the M-MDS.
(See DTC INSPECTION.)

•  Are any DTCs present?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

No

Go to the next step.

2

PERFORM BRAKE PEDAL INSPECTION

•  Inspect the applicable part.
(See BRAKE PEDAL INSPECTION.)

•  Are the brake pedal height, play, and the brake pedal-to-floor clearance normal?

Yes

Go to the next step.

No

Repair, replace, or adjust the related part according to the nature of the malfunction.

Repair completion verification

VERIFY IF MALFUNCTION CAUSE IS CORRECTED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.

Explain repair contents to customer.

No

Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

Step	Inspection	Results	Action
1	CONFIRM ELECTRONICALLY CONTROLLED BRAKE UNIT DTC • Retrieve the electronically controlled brake unit DTC using the M-MDS. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
1		No	Go to the next step.
2	PERFORM BRAKE PEDAL INSPECTION • Inspect the applicable part. (See BRAKE PEDAL INSPECTION.) • Are the brake pedal height, play, and the brake pedal-to-floor clearance normal?	Yes	Go to the next step.
2		No	Repair, replace, or adjust the related part according to the nature of the malfunction.
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain repair contents to customer.
Repair completion verification		No	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1.