Toyota Avalon Service & Repair Manual: Actuator Malfunction (C13A7)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A7

Actuator Malfunction

When the electric parking brake is operating, motor lock, gear lock, motor spinning or repeated slipping occurs.

  • Parking brake actuator assembly
  • Rear brake
  • Wire harness or connector

DTC stored

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

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • This DTC may be stored when the system changes to pad replacement mode, but this is not a malfunction.
  • This DTC may be stored when the parking brake is forcibly released, but this is not a malfunction.
  • 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 (red) blinks when the engine switch is first turned on (IG).

PROCEDURE

1.

CHECK DTC

(a) Check for DTCs.

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

Only DTC C13A7 is output

A

DTCs other than C13A7 are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

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

3.

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

4.

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

5.

INSPECT REAR BRAKE AND PARKING BRAKE ACTUATOR ASSEMBLY

(a) Enter rear brake pad replacement mode.

Click here

(b) Turn the engine switch off.

(c) Check that the rotating parts are not seized or the actuator is not spinning freely.

(1) Check that the parking brake actuator assembly is installed properly to the rear brake caliper and that it is not spinning freely.

For the parking brake actuator assembly removal procedure: Click here

(2) Check that there is no damage to the rotating parts from the parking brake actuator assembly to the rear brake caliper.

(3) Inspect the parking brake actuator assembly and check that it operates correctly.

Click here

(4) Check that the rear brake caliper threaded part rotates and that the rear disc brake piston moves outward.

HINT:

For the check procedures, refer to the parking brake forced release method when not using the Techstream.

Click here

HINT:

Return to normal mode after work is complete.

Click here

OK

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE NECESSARY PARTS

    Open or Short Circuit in Motor (C13A6)

    EPB High Temperature (C13AA)

    See More:

    Toyota Avalon Service & Repair Manual > Adaptive Variable Suspension System: Parts Location
    PARTS LOCATION ILLUSTRATION *1 FRONT ABSORBER CONTROL ACTUATOR RH (FRONT SHOCK ABSORBER ASSEMBLY RH) *2 FRONT ABSORBER CONTROL ACTUATOR LH (FRONT SHOCK ABSORBER ASSEMBLY LH) *3 REAR ABSORBER CONTROL ACTUATOR RH (REAR SHOCK ABSORBER ASSEMBLY RH) *4 REAR ABSORBER CONTROL ACTUATOR LH (REAR SHOCK ABSORB ...

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