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

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