Toyota Venza Quiz
Power Assist Systems

Motor Circuit Malfunction (C1522-C1555)

In this manual: Power Assist Systems
Introduction — 15Maintenance — 8Audio / Video — 102Garage Door Opener — 8Navigation / Multi Info Display — 81Park Assist / Monitoring — 50Brake (front) — 7Brake (rear) — 7Brake Control / Dynamic Control Systems — 79Brake System (other) — 28Parking Brake — 22Axle And Differential — 44Drive Shaft / Propeller Shaft — 24Mf1a Transfer / 4wd / Awd — 46U660e Automatic Transmission / Transaxle — 1241ar-fe Cooling — 311ar-fe Emission Control — 101ar-fe Engine Control — 1331ar-fe Engine Mechanical — 441ar-fe Fuel — 311ar-fe Intake / Exhaust — 211ar-fe Lubrication — 111ar-fe Starting — 16Cruise Control — 241ar-fe Battery / Charging — 162gr-fe Battery / Charging — 17Networking — 67Power Distribution — 8Power Assist Systems — 34Steering Column — 37Steering Gear / Linkage — 29Alignment / Handling Diagnosis — 4Front Suspension — 39Rear Suspension — 35Tire / Wheel — 4Tire Pressure Monitoring — 35Door / Hatch — 83Exterior Panels / Trim — 56Horn — 4Lighting (ext) — 89Mirror (ext) — 36Sliding Roof / Convertible — 26Window / Glass — 87Wiper / Washer — 30Door Lock — 85Heating / Air Conditioning — 82Interior Panels / Trim — 20Lighting (int) — 37Meter / Gauge / Display — 41Mirror (int) — 9Power Outlets (int) — 10Seat — 84Seat Belt — 43Supplemental Restraint Systems — 131Theft Deterrent / Keyless Entry — 155
~2min read
DESCRIPTION

The power steering ECU supplies current to the power steering motor through the motor circuit.

DTC No.

DTC Detection Condition

Trouble Area

C1522

Motor current sensor malfunction
  • Steering column assembly
  • Power steering ECU

C1523

Excessively large current deviation

C1524

Short (or open) in motor circuit or abnormal voltage or current in motor circuit

C1555

Motor relay failure
WIRING DIAGRAM
CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU and steering column assembly have been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration (See page ).


PROCEDURE

  1. READ VALUE USING TECHSTREAM (MOTOR VOLTAGE)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Select the items "Motor Terminal Volt(U)", "Motor Terminal Volt(V)" and "Motor Terminal Volt(W)" in the Data List and read the value displayed on the Techstream.

EMPS

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Motor Terminal Volt(U)

Motor terminal voltage (U phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Motor Terminal Volt(V)

Motor terminal voltage (V phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Motor Terminal Volt(W)

Motor terminal voltage (W phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Result

Proceed to

During steering operation, value changes within 4 to 46 V range

A

During steering operation, voltage is not generated

B

A

REPLACE POWER STEERING ECU

B

REPLACE STEERING COLUMN ASSEMBLY

Test yourself

A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.