Terminals Of Ecu

CHECK POWER STEERING ECU

Fig 1: Identifying Power Steering ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As connector S3 uses a lock lever, each terminal cannot be checked while the connector is still connected to the power steering ECU.

ECU CONNECTOR TERMINAL DESCRIPTION CHART

Terminal No. (Symbols)	Wiring Color	Terminal Description
S3-1 (MV)	W	V phase motor output
S3-2 (MU)	B	U phase motor output
S3-3 (MW)	R	W phase motor output

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

NOTE: When the PS warning light is illuminated during a malfunction, the fail-safe function may cause the voltage of the power steering ECU'S terminals to become 0 V.

VOLTAGE AND RESISTANCE SPECIFICATION

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A24-1 (PIG) - A24-2 (PGND)	L-W - B	Power source	Always	11 to 14 V
A24-2 (PGND) - Body ground	W - B - Body ground	Power ground	Always	Below 1 Ω
C34-1 (CANH) - C34-7 (CANL)	SB-W	CAN communication line	Ignition switch OFF	54 to 69 Ω
C34-6 (IG) - A24-2 (PGND)	L-W - B IG	power source	Ignition switch ON	11 to 14 V
S1-5 (TRQ1) - S1-8 (TRQG)	W - B	Torque sensor signal	Ignition switch ON Steering wheel not turned (without load)	2.3 to 2.7 V
			Ignition switch ON Steering wheel turned to right with vehicle stopped	2.5 to 3.8 V
			Ignition switch ON Steering wheel turned to left with vehicle stopped	1.2 to 2.5 V
S1-6 (TRQV) - S1-8 (TRQG)	R - B	Torque sensor voltage source	Ignition switch ON	4.5 to 5.5 V
S1-7 (TRQ2) - S1-8 (TRQG)	Y - B	Torque sensor signal	Ignition switch ON Steering wheel not turned (without load)	2.3 to 2.7 V
			Ignition switch ON Steering wheel turned to right with vehicle stopped	1.2 to 2.5 V
			Ignition switch ON Steering wheel turned to left with vehicle stopped	2.5 to 3.8 V
S1-8 (TRQG) - Body ground	B - Body ground	Torque sensor ground	Always	Below 1 Ω
S2-1 (R+) - A24-2 (PGND)	R-W - B	Rotation angle sensor excitation output signal	Ignition switch ON Steering wheel is turned	0.68 to 4.42 V
S2-3 (RGND) - A24-2 (PGND)	B-W - B	Rotation angle sensor excitation circuit GND	Always	Below 1 Ω
S2-5 (RCOS) - A24-2 (PGND)	L-W - B	Rotation angle sensor COS aspect output signal	Ignition switch ON Steering wheel is turned	0.68 to 4.42 V
S2-6 (RSIN) - A24-2 (PGND)	Y-W - B	Rotation angle sensor SIN aspect output signal	Ignition switch ON Steering wheel is turned	0.68 to 4.42 V