ELECTRIC PARKING BRAKE AUTOMATIC RELEASE FUNCTION AT START OPERATION TOO EARLY/LATE ON SLOPE [ELECTRIC PARKING BRAKE]

id040328250900

Outline

Description

The electric parking brake is released too early when the electric parking brake automatic release function at start is operated on a slope.

The electric parking brake is released too late when the electric parking brake automatic release function at start 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 SYSTEM DTCs

•  Switch the main power OFF.

•  Switch the main power ON (READY off or on) and wait for 10 s or more.

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

•  Are any DTCs 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

VERIFY ELECTRIC PARKING BRAKE WARNING LIGHT ON CONDITION

•  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 the [ELECTRIC PARKING BRAKE WARNING LIGHT TURNED ON] item.

(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 [L.H.D.].)

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

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.

Description	The electric parking brake is released too early when the electric parking brake automatic release function at start is operated on a slope. The electric parking brake is released too late when the electric parking brake automatic release function at start is operated on a slope.
Possible cause	• Electronically controlled brake unit malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Step	Inspection	Results	Action
1	VERIFY SYSTEM DTCs • Switch the main power OFF. • Switch the main power ON (READY off or on) and wait for 10 s or more. • Perform a Quick Check using the M-MDS. (See DTC INSPECTION.) • Are any DTCs 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	VERIFY ELECTRIC PARKING BRAKE WARNING LIGHT ON CONDITION • 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 the [ELECTRIC PARKING BRAKE WARNING LIGHT TURNED ON] item. (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 [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
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.