Terminals Of Ecu [09/2014 - 03/2019]

TERMINALS OF ECU

Fig 1: Power Steering ECU Assembly Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Power Steering ECU Assembly)

HINT:

The power steering ECU assembly uses waterproof connectors. Therefore, voltage or waveforms cannot be checked with the connectors connected to the vehicle.

Terminal No. (Symbol)	Wiring Color	Terminal Description
A18-2 (CA1L)	B	Low-level CAN bus line (V Bus)
A18-3 (CA1H)	G	High-level CAN bus line (V Bus)
A18-5 (TS)	SB	TS signal
A18-9 (PGND)	B	Power ground
A18-10 (PIG)	B	Power source
A18-12 (RLY)	LG	EPS relay drive signal
A18-14 (IG)	B	IG power source
C5-1 (RZG)	G	Motor rotation angle sensor power source circuit ground
C5-2 (SRZG)	BR	Motor rotation angle sensor shield ground
C5-3 (RZV)	B	Motor rotation angle sensor power source
C5-4 (TRQV)	W	Torque sensor power source
C5-6 (TQG1)	P	Torque sensor power source circuit ground
C5-7 (RZSN)	W	SIN phase input signal (Motor rotation angle sensor)
C5-8 (RZCS)	R	COS phase input signal (Motor rotation angle sensor)
C5-9 (INSN)	B	SIN phase input signal (Torque sensor input shaft side)
C5-10 (INCS)	R	COS phase input signal (Torque sensor input shaft side)
C5-11 (OUSN)	L	SIN phase input signal (Torque sensor output shaft side)
C5-12 (OUCS)	G	COS phase input signal (Torque sensor output shaft side)
C5-13 (TQG2)	V	Torque sensor detection circuit ground
C4-1 (V)	W	V phase motor output
C4-2 (W)	R	W phase motor output
C4-3 (U)	B	U phase motor output

CHECK WIRE HARNESS SIDE CONNECTOR

Fig 2: Wire Harness Side Connector Terminal Identification

Front view of wire harness connector
(to Power Steering ECU Assembly)

Disconnect the A18, C4 and C5 power steering ECU assembly connectors.
Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A18-9 (PGND) - Body ground	B - Body ground	Power ground	Always	Below 1 Ω
A18-12 (RLY) - Body ground	LG - Body ground	EPS relay source	Always	9 to 16 V
A18-14 (IG) - Body ground	B - Body ground	IG power source	Engine switch on (IG)	8 to 16 V
C4-1 (V) - C4-2 (W) or C4-3 (U)	W - R or B	V phase motor output	Always	Below 1 Ω
C4-2 (W) - C4-3 (U) or C4-1 (V)	R - B or W	W phase motor output	Always	Below 1 Ω
C4-3 (U) - C4-1 (V) or C4-2 (W)	B - W or R	U phase motor output	Always	Below 1 Ω