Toyota Avalon Service & Repair Manual: Engine Switch/Power Switch Malfunction (C13A2)

DESCRIPTION

When the power switch is turned on (IG), power is supplied to the parking brake ECU (brake actuator assembly). This DTC is stored if IG power source voltage is not supplied to the parking brake ECU (brake actuator assembly) when communication with other ECUs is established.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A2

Engine Switch/Power Switch Malfunction

Both of following conditions are met:

  • Power switch on (IG)
  • When hybrid vehicle control ECU communicates with main body ECU (multiplex network body ECU) via CAN communication, IG power supply voltage is not received for approximately 15 seconds.
  • Wire harness or connector
  • IG power source circuit
  • Parking brake 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:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
  • The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.

READ VALUE USING TECHSTREAM (IG SWITCH)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

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

Chassis > Electric Parking Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

IG Switch

IG power source status

OFF or ON

OFF: IG power source voltage is not input to skid control ECU (brake booster with master cylinder assembly)

ON: IG power source voltage is input to skid control ECU (brake booster with master cylinder assembly)

-

Chassis > Electric Parking Brake > Data List

Tester Display

IG Switch

NG

GO TO STEP 3

OK

2.

CHECK DTC

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

(c) Check for DTCs.

Chassis > Electric Parking Brake > Trouble Codes

Result

Proceed to

DTCs are output

A

DTCs are not output

B

A

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

B

USE SIMULATION METHOD TO CHECK

3.

CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - POWER SOURCE AND BODY GROUND)

*a

Front view of wire harness connector

(to Parking Brake ECU (Brake Actuator Assembly))

(a) Disconnect the A39 parking brake ECU (brake actuator assembly) connectors.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A39-26 (IG) - Body ground

Power switch on (IG)

8 to 16 V

(d) Turn the power switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A39-2 (EGND) - Body ground

Always

Below 1 Ω

OK

REPAIR IG POWER SOURCE CIRCUIT

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Short circuit in Power source circuit (C13A1)

    Open or Short Circuit in Motor (C13A6)

    See More:

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