Terminals Of Ecu

CHECK POWER STEERING ECU ASSEMBLY

Fig 1: Power Steering ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

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
L188-6 (IG) - Body ground	B - Body ground	IG power source	Power switch on (IG)	9 to 16 V
L188-1 (CANH) - L188-7 (CANL)	R - W	CAN communication line	Power switch off	54 to 69 Ω
z27-7 (TRQ2) - Body ground	Y - Body ground	Torque sensor 2 input signal	Power switch on (READY), steering wheel not being turned (without load)	2.3 to 2.7 V
			Power switch on (READY), steering wheel being turned to right	1.2 to 2.5 V
			Power switch on (READY), steering wheel being turned to left	2.5 to 3.8 V
z27-8 (TRQG) - Body ground	B - Body ground	Torque sensor ground	Always	Below 1 Ω
z27-6 (TRQV) - Body ground	R - Body ground	Torque sensor power source	Power switch on (READY)	4.5 to 5.5 V
z27-5 (TRQ1) - Body ground	W - Body ground	Torque sensor 1 input signal	Power switch on (READY), steering wheel not being turned (without load)	2.3 to 2.7 V
			Power switch on (READY), steering wheel being turned to right	2.5 to 3.8 V
			Power switch on (READY), steering wheel being turned to left	1.2 to 2.5 V
z28-1 (M1) - Body ground	R - Body ground	Power steering motor output signal 1	Power switch on (READY), steering wheel being turned to left	9 to 16 V
z28-1 (M1) - Body ground	R - Body ground	Power steering motor output signal 1	Power switch on (READY), steering wheel being turned to right	Below 1 V
z28-2 (M2) - Body ground	B - Body ground	Power steering motor output signal 2	Power switch on (READY), steering wheel being turned to left	Below 1 V
z28-2 (M2) - Body ground	B - Body ground	Power steering motor output signal 2	Power switch on (READY), steering wheel being turned to right	9 to 16 V
A27-1 (PIG) - Body ground	W - Body ground	Power steering motor power supply input signal	Always	9 to 16 V
A27-2 (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.