POWER STEERING SYSTEM > TERMINALS OF ECU

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CHECK POWER STEERING ECU ASSEMBLY

C136844E16


Text in Illustration 
*a
Component without harness connected
(Power Steering ECU Assembly)
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-

HINT:
As connector z13 uses a lock lever, each terminal cannot be checked while the connector is still connected to the power steering ECU assembly.


Terminal No. (Symbol)
Wiring Color
Terminal Description
z13-1 (V)
W
V phase motor output
z13-2 (U)
B
U phase motor output
z13-3 (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 assembly terminals to become 0 V.


    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A26-1 (PIG) - A26-2 (PGND)
    		W - W-B
    		Power source
    		Always
    		9 to 16 V
    A26-2 (PGND) - Body ground
    		W-B - Body ground
    		Power ground
    		Always
    		Below 1 Ω
    H25-1 (CANH) - H25-7 (CANL)
    		R - W
    		CAN communication line
    		Power switch off
    		54 to 69 Ω
    H25-6 (IG) - A26-2 (PGND)
    		G - W-B
    		IG power source
    		Power switch on (IG)
    		9 to 16 V
    z12-1 (RZV) - A26-2 (PGND)
    		R - W-B
    		Rotation angle sensor excitation output signal
    		Power switch on (READY)
    Steering wheel turned
    		0.68 to 4.42 V
    z12-3 (RZG) - A26-2 (PGND)
    		B - W-B
    		Rotation angle sensor excitation circuit GND
    		Always
    		Below 1 Ω
    z12-5 (RZCS) - A26-2 (PGND)
    		L - W-B
    		Rotation angle sensor COS aspect output signal
    		Power switch on (READY)
    Steering wheel turned
    		0.68 to 4.42 V
    z12-6 (RZSN) - A26-2 (PGND)
    		Y - W-B
    		Rotation angle sensor SIN aspect output signal
    		Power switch on (READY)
    Steering wheel turned
    		0.68 to 4.42 V
    z11-5 (TRQ1) - z11-8 (TRQG)
    		W - B
    		Torque sensor signal
    		Power switch on (READY)
    Steering wheel not being turned (without load)
    		2.3 to 2.7 V
    Power switch on (READY)
    Steering wheel turned being to right with vehicle stopped
    		2.5 to 3.8 V
    Power switch on (READY)
    Steering wheel being turned to left with vehicle stopped
    		1.2 to 2.5 V
    z11-6 (TRQV) - z11-8 (TRQG)
    		R - B
    		Torque sensor voltage source
    		Power switch on (IG)
    		4.5 to 5.5 V
    z11-7 (TRQ2) - z11-8 (TRQG)
    		Y - B
    		Torque sensor 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 with vehicle stopped
    		1.2 to 2.5 V
    Power switch on (READY)
    Steering wheel being turned to left with vehicle stopped
    		2.5 to 3.8 V
    z11-8 (TRQG) - Body ground
    		B - Body ground
    		Torque sensor ground
    		Always
    		Below 1 Ω
    If the result is not as specified, the ECU may have a malfunction.