Toyota Yaris: Power Steering System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / Terminals Of Ecu

TERMINALS OF ECU

CHECK POWER STEERING ECU ASSEMBLY

Component without harness connected

(Power Steering ECU Assembly)

(a) Measure the voltage and resistance according to the value(s) in the table below.

NOTICE:

When the EPS warning light is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU assembly terminals to become 0 V.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
H1-1 (IG) - Body ground	IG power source	Ignition switch ON	8 to 16 V
H1-7 (CANH) - H1-8 (CANL)	CAN communication line	Ignition switch off	54 to 69 Ω
z7-1 (TRQ2) - z7-2 (TRQG2)	Torque sensor 2 signal	Engine running and steering wheel not being turned (without load)	2.3 to 2.7 V
		Engine running and steering wheel being turned to the right with vehicle stopped	1.2 to 2.5 V
		Engine running and steering wheel being turned to the left with vehicle stopped	2.5 to 3.8 V
z7-2 (TRQG2) - Body ground	Torque sensor 2 ground	Always	Below 1 Ω
z7-3 (TRQV2) - z7-2 (TRQG2)	Torque sensor 2 voltage source	Ignition switch ON	4.5 to 5.5 V
z7-7 (TRQV1) - z7-8 (TRQG1)	Torque sensor 1 voltage source	Ignition switch ON	4.5 to 5.5 V
z7-8 (TRQG1) - Body ground	Torque sensor 1 ground	Always	Below 1 Ω
z7-9 (TRQ1) - z7-8 (TRQG1)	Torque sensor signal	Engine running and steering wheel not being turned (without load)	2.3 to 2.7 V
		Engine running and steering wheel being turned to the right with vehicle stopped	2.5 to 3.8 V
		Engine running and steering wheel being turned to the left with vehicle stopped	1.2 to 2.5 V
H2-1 (PIG) - Body ground	Power source	Ignition switch ON	9 to 16 V
H2-2 (PGND) - Body ground	Power ground	Always	Below 1 Ω

If the result is not as specified, the ECU may be malfunctioning.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table...

Diagnosis System

DIAGNOSIS SYSTEM DTC The rack and pinion power steering gear assembly stores a DTC when it detects a malfunction in the ECU and power steering system circuit...

Other information:

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012087,U012687,U012987,U015187,U015587,U016487,U016887)

DESCRIPTION These DTCs are stored if a CAN communication malfunction occurs between the main body ECU (multiplex network body ECU) and other ECUs. DTC No. Detection Item DTC Detection Condition Trouble Area U010087 Lost Communication with ECM/PCM "A" Missing Message The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more...

Toyota Yaris XP210 (2020-2026) Owner's Manual: Supplemental Restraint System (SRS) Precautions

The front and side supplemental restraint systems (SRS) include different types of air bags. Please verify the different types of air bags which are equipped on your vehicle by locating the “SRS AIRBAG” location indicators. These indicators are visible in the area where the air bags are installed...