Toyota Yaris: Power Steering Ecu / Removal

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering Ecu / Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during the power steering ECU assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Power steering ECU assembly	Assist map writing	DTCs are stored EPS warning light illuminates
Power steering ECU assembly	Update ECU security key	Vehicle control history (RoB) are stored

HINT:

When the cable is disconnected/reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Learning completes when vehicle is driven

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	Link
Lane tracing assist system	Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 second or more.
Pre-collision system
Stop and start system	Drive the vehicle until stop and start control is permitted (approximately 5 to 60 minutes)

Learning completes when vehicle is operated normally

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	Link
Power door lock control system Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.
Air conditioning system	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

PROCEDURE

1. REMOVE STEERING COLUMN ASSEMBLY

Click here

2. REMOVE STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY

Click here

3. REMOVE POWER STEERING ECU ASSEMBLY

NOTICE:

Do not drop the power steering ECU assembly, strike it with tools or subject it to impacts.
If the power steering ECU assembly is subjected to an impact, replace it with a new one.
Do not pull the wire harness of the electric power steering column sub-assembly.
Do not allow any moisture to come into contact with the power steering ECU assembly.
Do not loosen any bolts not mentioned in the procedure.
Do not allow any foreign matter to contaminate the power steering ECU assembly.

(a) Disconnect the connector.

(b) Remove the 2 bolts and power steering ECU assembly from the electric power steering column sub-assembly.

4. REMOVE ELECTRIC POWER STEERING MOTOR SHAFT DAMPER

(a) Remove the electric power steering motor shaft damper from the electric power steering column sub-assembly.

Power Steering Ecu

Installation

INSTALLATION CAUTION / NOTICE / HINT NOTICE: After performing the update ECU security key procedure, make sure to perform the initialization procedure for when the cable has been disconnected and reconnected to the negative (-) auxiliary battery terminal...

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