Terminals Of Ecu [08/2013 - 08/2014]

CHECK POWER STEERING ECU ASSEMBLY

Fig 1: Power Steering ECU Assembly Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Power Steering ECU Assembly)

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

NOTE:

Check if the power steering ECU assembly connectors are securely connected by pulling on them from the backside.
If the EPS warning light is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU's terminals to become 0 V.

Terminals No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E40-1 (IG) - Body ground	L - Body ground	IG power source voltage	Ignition switch ON	8 to 16 V
E40-6 (TS) - Body ground	SB - Body ground	Test mode signal	Always	9 to 16 V
E40-7 (CANH) - E40-8 (CANL)	GR - W	CAN communication line	Ignition switch off	54 to 69 Ω
z7-1 (TRQ2) - z7-2 (TRQG)	Y - B	Torque sensor 2 input signal	Engine running, steering wheel not being turned (without load)	2.3 to 2.7 V
			Engine running, steering wheel being turned to right	1.2 to 2.5 V
			Engine running, steering wheel being turned to left	2.5 to 3.8 V
z7-2 (TRQG) - Body ground	B - Body ground	Torque sensor ground	Always	Below 1 Ω
z7-8 (TRQV) - z7-2 (TRQG)	R - B	Torque sensor power source	Ignition switch ON	4.5 to 5.5 V
z7-9 (TRQ1) - z7-2 (TRQG)	W - B	Torque sensor 1 input signal	Engine running, steering wheel not being turned (without load)	2.3 to 2.7 V
			Engine running, steering wheel being turned to right	2.5 to 3.8 V
			Engine running, steering wheel being turned to left	1.2 to 2.5 V
z8-1 (M1) - Body ground	R - Body ground	Power steering motor assembly output signal 1	Engine running, steering wheel being turned to right	9 to 16 V
z8-1 (M1) - Body ground	R - Body ground	Power steering motor assembly output signal 1	Engine running, steering wheel being turned to left	6 to 8 V
z8-2 (M2) - Body ground	B - Body ground	Power steering motor assembly output signal 2	Engine running, steering wheel being turned to right	6 to 8 V
z8-2 (M2) - Body ground	B - Body ground	Power steering motor assembly output signal 2	Engine running, steering wheel being turned to left	9 to 16 V
A25-1 (PIG) - Body ground	L - Body ground	Power steering motor assembly power supply input signal	Always	9 to 16 V
A25-2 (PGND) - Body ground	W-B - Body ground	Power ground	Always	Below 1 Ω

If the result is not as specified, the ECU may have a malfunction.