Lexus NX: Motor Rotation Angle Sensor (C1528)

DESCRIPTION

The motor rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

C1528

Motor Rotation Angle Sensor

Motor rotation angle sensor malfunction

  • Power steering motor assembly (Motor rotation angle sensor)
  • Power steering ECU assembly

On

Power switch on (IG) again

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU assembly has been replaced, perform assist map writing.

Click here

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION

(a) Check the connection condition of the motor rotation angle sensor connector.

OK:

Motor rotation angle sensor connector is securely connected to the power steering ECU assembly.

NG

CONNECT CONNECTOR

OK

2.

READ VALUE USING TECHSTREAM (MOTOR ROTATION ANGLE)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the item "Motor Rotation Angle" in the Data List and read the value displayed on the Techstream.

Chassis > EMPS > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Motor Rotation Angle

Motor rotation angle

Min.: 0.000 deg

Max.: 1441.770 deg

Power switch on (READY) and steering wheel being turned: During steering operation, motor rotation angle value changes from 0 to 360 deg

-

Chassis > EMPS > Data List

Tester Display

Motor Rotation Angle

OK:

During steering operation, motor rotation angle value changes from 0 to 360°.

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

3.

CHECK POWER STEERING MOTOR ASSEMBLY (MOTOR ROTATION ANGLE SENSOR)

(a) Disconnect the b motor rotation angle sensor connector.

*a

Front view of wire harness connector

(to Power Steering ECU Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b-6 (RZV1) - b-2 (RZV2)

25°C (77°F)

14.0 to 17.2 Ω

b-5 (RZCS1) - b-1 (RZCS2)

25°C (77°F)

25.8 to 31.6 Ω

b-7 (RZSN1) - b-3 (RZSN2)

25°C (77°F)

25.8 to 31.6 Ω

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPLACE POWER STEERING MOTOR ASSEMBLY

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SEE MORE:

 Data List / Active Test

DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. When diagnosing symptoms such as hesitation, rough idle, or other small symptoms usi

 Installation

INSTALLATION CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. If the side airbag was deployed, replace the front seat airbag assembly LH, separate type front seatback spring assembly, seatback felt, separate type front seatback cover and s

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