Toyota Yaris: Power Steering System / Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold (C155A16,C155A17,C155B16,C155B17)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold (C155A16,C155A17,C155B16,C155B17)

DESCRIPTION

If a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C155A16

Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold

Motor "1" PIG voltage is 3.6 V or less

  • EPS fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

C155A17

Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold

Diagnosis Condition: IG ON

Malfunction Status: Motor "1" PIG voltage is 19.6 V or more

  • EPS fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

C155B16

Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold

Motor "2" PIG voltage is 3.6 V or less

  • EPS fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

C155B17

Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold

Diagnosis Condition: IG ON

Malfunction Status: Motor "2" PIG voltage is 19.6 V or more

  • EPS fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).

    Click here

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

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

(a) Disconnect the H2 power steering ECU assembly connectors.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H2-1 (PIG) - Body ground

Engine running

4.5 to 5.5 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H2-2 (PGND) - Body ground

Always

Below 1 Ω

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Power Steering Torque Sensor "B" Supply Voltage Circuit Voltage Above Threshold (C151B17)

    DESCRIPTION The power steering ECU assembly supplies a voltage of 5 V to the torque sensor (electric power steering column sub-assembly) and monitors the voltage value of the Hall IC inside the torque sensor (electric power steering column sub-assembly) which changes in response to changes in the magnetic flux density (steering torque) detected by the Hall IC, and calculates the assist torque...

    Lost Communication with Steering Angle Sensor Module Missing Message (U012687,U010087,U012987,U014087,U023A87)

    DESCRIPTION The power steering ECU assembly receives signals from the steering sensor, skid control ECU (brake actuator assembly), forward recognition camera, ECM and clearance warning ECU assembly via CAN communication...

    Other information:

    Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: Inspection


    INSPECTION PROCEDURE 1. INSPECT REAR SHOCK ABSORBER ASSEMBLY (a) Compress and extend the rear shock absorber rod 4 times or more. Standard: When compressed and extended at a constant speed, the stroke of the shock absorber rod is smooth with no abnormal resistance or sounds...

    Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: On-vehicle Inspection


    ON-VEHICLE INSPECTION PROCEDURE 1. CHECK AUXILIARY BATTERY CONDITION NOTICE: If the auxiliary battery is weak or if the engine is difficult to start, recharge the auxiliary battery and perform inspections again before returning the vehicle to the customer...

    Categories

    Refueling

    Before refueling, close all the doors, windows, and the liftgate/trunk lid, and switch the ignition OFF.

    To open the fuel-filler lid, pull the remote fuel-filler lid release.

    Toyota Yaris. Refueling

    To remove the fuel-filler cap, turn it counterclockwise. Attach the removed cap to the inner side of the fuel-filler lid.

    read more

     
    Copyright © 2022 www.toyaris4.com