ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION DURING ACCELERATION OPERATION TOO EARLY/LATE ON SLOPE [ELECTRIC PARKING BRAKE]

id040328250700

Troubleshooting item

Electric parking brake automatic release function during acceleration operation too early/late on slope

Description

•  Electric parking brake is released too early when the electric parking brake automatic release function during acceleration is operated on a slope.

•  Electric parking brake is released too late when the electric parking brake automatic release function during acceleration is operated on a slope.

Possible cause

•  Electronically controlled brake unit malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Troubleshooting item	Electric parking brake automatic release function during acceleration operation too early/late on slope
Description	• Electric parking brake is released too early when the electric parking brake automatic release function during acceleration is operated on a slope. • Electric parking brake is released too late when the electric parking brake automatic release function during acceleration is operated on a slope.
Possible cause	• Electronically controlled brake unit malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY ALL SYSTEM DTCs

•  Switch the ignition off.

•  Switch the ignition ON (engine off or on) and wait for 10 s or more.

•  Perform the Quick Check using the M-MDS.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

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

No

Go to the next step.

2

VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON

•  Verify if the electric parking brake warning light is turned on.

•  Is the electric parking brake warning light turned on?

Yes

Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”.

(See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)

No

Replace the electronically controlled brake unit, and perform the repair completion verification.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)

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.

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.)

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

Step	Inspection	Results	Action
1	VERIFY ALL SYSTEM DTCs • Switch the ignition off. • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Perform the Quick Check using the M-MDS. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
1		No	Go to the next step.
2	VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON • Verify if the electric parking brake warning light is turned on. • Is the electric parking brake warning light turned on?	Yes	Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”. (See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)
2		No	Replace the electronically controlled brake unit, and perform the repair completion verification. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)
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.) If the CAN communication is normal, perform the diagnosis from Step 1.