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DTC U2000:4B [DSC HU/CM]

id040262011900

Outline

System malfunction location

Abnormal electric parking brake motor gear unit temperature

Detection condition

•  The DSC HU/CM determines that the temperature of the electric parking brake motor gear unit is high due to repeated operation of the electric parking brake for a short period.

Fail-safe

Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)

Possible cause

•  The electric parking brake was operated repeatedly for a short period.

•  DSC HU/CM malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Abnormal electric parking brake motor gear unit temperature
Detection condition	• The DSC HU/CM determines that the temperature of the electric parking brake motor gear unit is high due to repeated operation of the electric parking brake for a short period.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)
Possible cause	• The electric parking brake was operated repeatedly for a short period. • DSC HU/CM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY IF ELECTRIC PARKING BRAKE MOTOR GEAR UNIT TEMPERATURE WAS TEMPORARILY HIGH

•  Press down the electric parking brake switch, release the electric parking brake, and leave the vehicle for 30 min or more.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the following procedure 3 times or more.

―  Pull up the electric parking brake switch to operate the electric parking brake.

―  Press down the electric parking brake switch to release the electric parking brake.

•  Perform the DTC inspection for the DSC HU/CM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Go to the next step.

No

System is normal. (Explain to the customer that the protection control was performed by repeatedly operating the electric parking brake.)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the following procedure 3 times or more.

―  Pull up the electric parking brake switch to operate the electric parking brake.

―  Press down the electric parking brake switch to release the electric parking brake.

•  Perform the DTC inspection for the DSC HU/CM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

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.

•  If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].)

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY IF ELECTRIC PARKING BRAKE MOTOR GEAR UNIT TEMPERATURE WAS TEMPORARILY HIGH • Press down the electric parking brake switch, release the electric parking brake, and leave the vehicle for 30 min or more. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the following procedure 3 times or more. ― Pull up the electric parking brake switch to operate the electric parking brake. ― Press down the electric parking brake switch to release the electric parking brake. • Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Go to the next step.
1		No	System is normal. (Explain to the customer that the protection control was performed by repeatedly operating the electric parking brake.)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the following procedure 3 times or more. ― Pull up the electric parking brake switch to operate the electric parking brake. ― Press down the electric parking brake switch to release the electric parking brake. • Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	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. • If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.