Power Steering System (For 2Az-Fe) Terminals Of Ecu

Steering. Corolla. Zre142 Aze141
Power Assist Systems. Corolla. Zre142 Aze141

  1. CHECK POWER STEERING ECU

Power Steering System (For 2Az-Fe) -- Terminals Of Ecu



CHECK POWER STEERING ECU

Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe).Power Steering System (For 2Az-Fe) Terminals Of Ecu

HINT:
As connector a2 uses a lock lever, each terminal cannot be checked while the connector is still connected to the power steering ECU.

Terminal No. (Symbols)
Wiring Color
Terminal Description
a2-1 (V)
W
V phase motor output
a2-2 (U)
B
U phase motor output
a2-3 (W)
R
W phase motor output

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

    NOTICE:
    When the P/S 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.

    Terminal No. (Symbols)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A75-1 (PIG) - A75-2 (PGND)
    		L - W-B
    		Power source
    		Always
    		11 to 14 V
    A75-2 (PGND) - Body ground
    		W-B - Body ground
    		Power ground
    		Always
    		Below 1 Ω
    E32-1 (CANH) - E32-7 (CANL)
    		SB - W
    		CAN communication line
    		Ignition switch off
    		54 to 69 Ω
    E32-6 (IG) - A75-2 (PGND)
    		L - W-B
    		IG power source
    		Ignition switch on (IG)
    		11 to 14 V
    a1-1 (RZV) - A75-2 (PGND)
    		- W-B
    		Rotation angle sensor excitation output signal
    		Ignition switch on (IG)
    Steering wheel is turned
    		0.68 to 4.42 V
    a1-3 (RZG) - A75-2 (PGND)
    		- W-B
    		Rotation angle sensor excitation circuit GND
    		Always
    		Below 1 Ω
    a1-5 (RZCS) - A75-2 (PGND)
    		- W-B
    		Rotation angle sensor COS aspect output signal
    		Ignition switch on (IG)
    Steering wheel is turned
    		0.68 to 4.42 V
    a1-6 (RZSN) - A75-2 (PGND)
    		- W-B
    		Rotation angle sensor SIN aspect output signal
    		Ignition switch on (IG)
    Steering wheel is turned
    		0.68 to 4.42 V
    a3-5 (TRQ1) - a3-8 (TRQG)
    		-
    		Torque sensor signal
    		Ignition switch on (IG)
    Steering wheel not turned (without load)
    		2.3 to 2.7 V
    Ignition switch on (IG)
    Steering wheel turned to right with vehicle stopped
    		2.5 to 3.8 V
    Ignition switch on (IG)
    Steering wheel turned to left with vehicle stopped
    		1.2 to 2.5 V
    a3-6 (TRQV) - a3-8 (TRQG)
    		-
    		Torque sensor voltage source
    		Ignition switch on (IG)
    		4.5 to 5.5 V
    a3-7 (TRQ2) - a3-8 (TRQG)
    		-
    		Torque sensor signal
    		Ignition switch on (IG)
    Steering wheel not turned (without load)
    		2.3 to 2.7 V
    Ignition switch on (IG)
    Steering wheel turned to right with vehicle stopped
    		1.2 to 2.5 V
    Ignition switch on (IG)
    Steering wheel turned to left with vehicle stopped
    		2.5 to 3.8 V
    a3-8 (TRQG) - Body ground
    		- Body ground
    		Torque sensor ground
    		Always
    		Below 1 Ω
    If the result is not as specified, the ECU may have a malfunction.