POWER STEERING SYSTEM TERMINALS OF ECU


  1. CHECK POWER STEERING ECU

    A003U0AE13
    Text in Illustration
    *1

    Component without harness connected

    (Power Steering ECU)

    Tech Tips

    As connector h3 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
    h3-1 (V) W V phase motor output
    h3-2 (U) B U phase motor output
    h3-3 (W) R W phase motor output

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

      Note

      When the P/S warning light is illuminated during a malfunction, the fail-safe function may cause the voltage of the power steering ECU 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 9 to 16 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 Power switch off 54 to 69 Ω
      E32-6 (IG) - A75-2 (PGND) L - W-B IG power source Power switch on (IG) 9 to 16 V
      h2-3 (RZG) - A75-2 (PGND) B - W-B Rotation angle sensor excitation circuit GND Always Below 1 Ω
      h2-1 (RZV) - A75-2 (PGND) R - W-B Rotation angle sensor excitation output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      h2-6 (RZSN) - A75-2 (PGND) Y - W-B Rotation angle sensor SIN aspect output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      h2-5 (RZCS) - A75-2 (PGND) L - W-B Rotation angle sensor COS aspect output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      h1-5 (TRQ1) - h1-8 (TRQG) - Torque sensor signal

      Power switch on (READY)

      Steering wheel not turned (without load)

      		 2.3 to 2.7 V

      Power switch on (READY)

      Steering wheel turned to right with vehicle stopped

      		 2.5 to 3.8 V

      Power switch on (READY)

      Steering wheel turned to left with vehicle stopped

      		 1.2 to 2.5 V
      h1-6 (TRQV) - h1-8 (TRQG) - Torque sensor voltage source Power switch on (IG) 4.5 to 5.5 V
      h1-7 (TRQ2) - h1-8 (TRQG) - Torque sensor signal

      Power switch on (READY)

      Steering wheel not turned (without load)

      		 2.3 to 2.7 V

      Power switch on (READY)

      Steering wheel turned to right with vehicle stopped

      		 1.2 to 2.5 V

      Power switch on (READY)

      Steering wheel turned to left with vehicle stopped

      		 2.5 to 3.8 V
      h1-8 (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.