WARNING LIGHTS AND INDICATOR LIGHTS ARE NORMAL, BUT THERE IS SOME MALFUNCTION WITH BRAKES [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

id040309070600

Outline

Description

Warning lights and indicator lights are normal, but there is some malfunction with brakes

Possible cause

• Mechanical malfunction in system

System wiring diagram

Not applicable

Connector diagram

Not applicable

Description	Warning lights and indicator lights are normal, but there is some malfunction with brakes
Possible cause	• Mechanical malfunction in system
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT DTCs

•  Verify the electronically controlled brake unit DTCs.
(See DTC INSPECTION.)

•  Is a DTC displayed?

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

COMPARE WITH VEHICLE OF SAME MODEL

•  With the same brake pedal force, is the pedal stroke extremely small compared to a vehicle of the same model?

Yes

Replace the electronically controlled brake unit and perform the repair completion verification. (Master cylinder or simulator valve sticking)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)

No

Inspect the brake system.

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	VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT DTCs • Verify the electronically controlled brake unit DTCs. (See DTC INSPECTION.) • Is a DTC displayed?	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	COMPARE WITH VEHICLE OF SAME MODEL • With the same brake pedal force, is the pedal stroke extremely small compared to a vehicle of the same model?	Yes	Replace the electronically controlled brake unit and perform the repair completion verification. (Master cylinder or simulator valve sticking) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
2		No	Inspect the brake system.
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.