NO.4 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND DSC OFF INDICATOR LIGHT DO NOT ILLUMINATE [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

id040309890400

Troubleshooting item

There is a malfunction in the system even though ABS warning light, brake system warning light, TCS/DSC indicator light and DSC OFF indicator light do not illuminate

Possible cause

• There is a mechanical malfunction in system.

Troubleshooting item	There is a malfunction in the system even though ABS warning light, brake system warning light, TCS/DSC indicator light and DSC OFF indicator light do not illuminate
Possible cause	• There is a mechanical malfunction in system.

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	Go to the applicable DTC inspection. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
1		No	Go to the next step.
2	COMPARE WITH SAME MODEL VEHICLE • 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 stuck) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)
2		No	Inspect the conventional brake system.
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain to the customer what has been repaired.
Repair completion verification		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1.