Toyota Avalon (XX50): Motor Circuit (C1428). Steering Angle Sensor Power Source Voltage (C1432). Steering Angle Sensor Internal Circuit (C1433)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Gasoline Model) / Motor Circuit (C1428). Steering Angle Sensor Power Source Voltage (C1432). Steering Angle Sensor Internal Circuit (C1433)

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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1428	Motor Circuit	A malfunction occurs in the pump motor circuit.	Pump motor circuit

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

1.	CHECK HARNESS AND CONNECTOR (+BM TERMINAL)

(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.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A28-1 (+BM) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

2.	CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(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))

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

3.	RECONFIRM DTC

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

(b) Clear the DTCs.

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(d) Start the engine.

(e) Perform a road test.

(f) Check if the same DTC is output.

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

Result	Proceed to
C1428 is not output	A
C1428 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

Steering Angle Sensor Power Source Voltage (C1432)

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) receives a +B line open signal from the steering angle sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1432	Steering Angle Sensor Power Source Voltage	With the +BS terminal voltage between 9.6 and 16.5 V, a steering angle sensor power supply circuit malfunction signal is received from the steering angle sensor.	Steering angle sensor power supply Steering angle sensor

WIRING DIAGRAM

Refer to DTC C1231.

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CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Remove the steering wheel and column cover.

*a	Front view of wire harness connector (to Steering Angle Sensor)

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

OK:

The connector is securely connected.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G48-4 (BAT) - Body ground	Always	11 to 14 V
G48-9 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

2.	CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Turn the engine switch off.

*a	Front view of wire harness connector (to Steering Angle Sensor)

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

NOTICE:

Before measuring the resistance of the steering angle sensor, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or switches, or opening or closing the doors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-6 (ESS) - Body ground	1 minute after engine switch off	Below 1 Ω

REPLACE STEERING ANGLE SENSOR

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

Steering Angle Sensor Internal Circuit (C1433)

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) receives an internal malfunction signal from the steering angle sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1433	Steering Angle Sensor Internal Circuit	With the +BS terminal voltage between 9.6 and 16.5 V, a steering angle sensor malfunction signal is received from the steering angle sensor.	Steering angle sensor

PROCEDURE

1.	REPLACE STEERING ANGLE SENSOR

(a) Replace the steering angle sensor.

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END

Stop Switch OFF Stuck (C1426)

Steering Angle Sensor Output (C1434). Malfunction in Yaw Rate Sensor (C1436). Steering Angle Sensor Initialization Incomplete (C1439,C1445)

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