Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Steering Angle Sensor Output (C1434)

DESCRIPTION

Steering angle sensor signals are input to the skid control ECU (brake booster with master cylinder assembly) via the CAN communication system.

HINT:

When a malfunction occurs in the communication line to the steering angle sensor, U0126 (Lost Communication With Steering Angle Sensor Module) is output.

If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.

DTCs may be stored if one of the following occurs:

• Steering angle sensor zero point malfunction.
• Steering angle sensor signal malfunction.
• Steering angle sensor installation abnormality.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

(a) Clear the DTCs.

Click here

(b) Turn the power switch off.

(c) Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.

Click here

(d) Turn the power switch on (READY).

(e) Drive the vehicle at a speed of 35 km/h (22 mph), turn the steering wheel to the right and left, and check that no speed sensor and/or yaw rate and acceleration sensor DTCs are output.

Click here

HINT:

• If there is a malfunction in a speed sensor or the yaw rate and acceleration sensor (airbag ECU assembly), an abnormal value may be output even though the steering angle sensor is normal.
• If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair these malfunctions and inspect the steering angle sensor.

B

INSPECT CAN COMMUNICATION SYSTEM

C

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

(a) Turn the power switch off.

(b) Check that the steering angle sensor has been installed properly.

Click here

OK:

The steering angle sensor installation is normal.

NG

INSTALL STEERING ANGLE SENSOR CORRECTLY

OK

(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.

(c) Disconnect the G48 steering angle sensor connector.

(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:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

(a) Turn the power 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 power 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:

OK

REPLACE STEERING ANGLE SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)