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

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Diagnosis System

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Other information:

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