Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Motor Circuit (C1428)

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor.

WIRING DIAGRAM

Refer to DTC C146C.

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CAUTION / NOTICE / HINT

NOTICE:

• When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

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• Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected.

*a Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

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

OK:

No deformation or corrosion.

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

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition A28-14 (GND2) - Body ground Always Below 1 Ω

*a Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

OK

(a) Reconnect the A28 skid control ECU (brake actuator assembly) connector.

(b) Clear the DTCs.

(c) Turn the engine switch off.

(d) Start the engine.

(e) Perform a road test.

(f) Check if the same DTC is output.

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY