Toyota Avalon Service & Repair Manual: Open or Short Circuit in Motor (C13A6)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A6

Open or Short Circuit in Motor

Parking brake actuator assembly open or short circuit is detected for 0.015 seconds or more.

  • Parking brake actuator assembly
  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The electric parking brake may still operate up to 20 seconds after the engine switch is turned off. Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.
  • When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch (electric parking brake switch assembly) as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).

PROCEDURE

1.

READ VALUE USING TECHSTREAM (PERMISSION OF RH INTERLOCKING PKB LOCK / PERMISSION OF LH INTERLOCKING PKB LOCK)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Permission of RH Interlocking PKB Lock

Parking brake actuator assembly RH parking brake lock control permission status

OK or NG

OK

-

Permission of LH Interlocking PKB Lock

Parking brake actuator assembly LH parking brake lock control permission status

OK or NG

OK

-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Permission of RH Interlocking PKB Lock

Permission of LH Interlocking PKB Lock

NEXT

2.

INSPECT PARKING BRAKE WIRE ASSEMBLY

*A

RH

*B

LH

*a

Front view of Parking Brake Wire Assembly

*b

(to wire harness connector)

*c

(to Parking Brake Actuator Assembly)

-

-

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Remove the parking brake wire assembly.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Inspect the parking brake wire assembly.

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

YK1-1 (MRR-) - Y4-1 (RE-)

Always

Below 1 Ω

YK1-1 (MRR-) or Y4-1 (RE-) - Body ground and other terminals

Always

10 kΩ or higher

YK1-2 (MRR+) - Y4-2 (RE+)

Always

Below 1 Ω

YK1-2 (MRR+) or Y4-2 (RE+) - Body ground and other terminals

Always

10 kΩ or higher

LH

Tester Connection

Condition

Specified Condition

YK2-1 (MRL-) - Y1-1 (LE-)

Always

Below 1 Ω

YK2-1 (MRL-) or Y1-1 (LE-) - Body ground and other terminals

Always

10 kΩ or higher

YK2-2 (MRL+) - Y1-2 (LE+)

Always

Below 1 Ω

YK2-2 (MRL+) or Y1-2 (LE+) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE PARKING BRAKE WIRE ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY)

(a) Turn the engine switch off.

(b) Make sure the parking brake wire assembly is securely installed.

(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

(d) Disconnect the Y4 or Y1 parking brake actuator assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

A28-2 (MRR+) - Y4-2 (RE+)

Always

Below 1 Ω

A28-3 (MRR-) - Y4-1 (RE-)

Always

Below 1 Ω

A28-2 (MRR+) or Y4-2 (RE+) - Body ground

Always

10 kΩ or higher

A28-2 (MRR+) or Y4-1 (RE-) - Body ground

Always

10 kΩ or higher

LH

Tester Connection

Condition

Specified Condition

A28-13 (MRL+) - Y1-2 (LE+)

Always

Below 1 Ω

A28-12 (MRL-) - Y1-1 (LE-)

Always

Below 1 Ω

A28-13 (MRL+) or Y1-2 (LE+) - Body ground

Always

10 kΩ or higher

A28-12 (MRL-) or Y1-1 (LE-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT PARKING BRAKE ACTUATOR ASSEMBLY

(a) Remove the parking brake actuator assembly.

Click here

(b) Inspect the parking brake actuator assembly.

Click here

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

    Electric Current of Motor (C13A5,C13B0)

    Actuator Malfunction (C13A7)

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