POWER STEERING SYSTEM TERMINALS OF ECU


  1. CHECK POWER STEERING ECU ASSEMBLY

    A0040O6E22
    Text in Illustration
    *a

    Component without harness connected

    (Power Steering ECU Assembly)

    		 - -

    Tech Tips

    As connector z16 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
    z16-1 (MV) W V phase motor output
    z16-2 (MU) B U phase motor output
    z16-3 (MW) R W phase motor output

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

      Note

      When the EPS 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
      A27-1 (PIG) - A27-2 (PGND) W - W-B Power source Always 9 to 16 V
      A27-2 (PGND) - Body ground W-B - Body ground Power ground Always Below 1 Ω
      L45-1 (CANH) - L45-7 (CANL) R - W CAN communication line Power switch off 54 to 69 Ω
      L45-6 (IG) - A27-2 (PGND) L - W-B IG power source Power switch on (IG) 9 to 16 V
      z15-1 (R+) - A27-2 (PGND) R - W-B Rotation angle sensor excitation output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      z15-3 (RGND) - A27-2 (PGND) B - W-B Rotation angle sensor excitation circuit GND Always Below 1 Ω
      z15-5 (RCOS) - A27-2 (PGND) L - W-B Rotation angle sensor COS aspect output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      z15-6 (RSIN) - A27-2 (PGND) Y - W-B Rotation angle sensor SIN aspect output signal

      Power switch on (READY)

      Steering wheel turned

      		 0.68 to 4.42 V
      z14-5 (TRQ1) - z14-8 (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
      z14-6 (TRQV) - z14-8 (TRQG) R - B Torque sensor voltage source Power switch on (IG) 4.5 to 5.5 V
      z14-7 (TRQ2) - z14-8 (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
      z14-8 (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.