POWER STEERING SYSTEM TERMINALS OF ECU

  1. CHECK POWER STEERING ECU

    U123258E02
    Tip:

    As connector A is connected to the power steering motor with screws, the terminals cannot be checked while the connector is still connected to the power steering motor.

    Terminal No. (Symbol)

    Terminal Description

    A-1 (PHC)

    V phase motor output

    A-2 (PHA)

    U phase motor output

    A-3 (PHB)

    W phase motor output

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H49-2 (CANH) - H49-8 (CANL)

      SB - W

      CAN communication line

      Ignition switch off

      54 to 69 Ω

      H49-5 (IG) - Body ground

      L - Body ground

      IG power supply

      Ignition switch ON

      11 to 14 V

      z17-3 (R1) - Body ground

      W - Body ground

      Rotation angle sensor excitation signal 1

      Engine running, steering wheel being turned

      4.5 to 8.5 V

      z17-5 (R2) - Body ground

      G - Body ground

      Rotation angle sensor excitation signal 2

      Engine running, steering wheel being turned

      4.5 to 8.5 V

      z17-6 (S4) - Body ground

      L - Body ground

      Rotation angle sensor COS aspect input signal

      Engine running, steering wheel being turned

      Below 1.5 V

      z17-7 (S2) - Body ground

      Y - Body ground

      Rotation angle sensor COS aspect input signal

      Engine running, steering wheel being turned

      -2.0 to 2.0 V

      z17-8 (S3) - Body ground

      B - Body ground

      Rotation angle sensor SIN aspect input signal

      Engine running, steering wheel being turned

      Below 1.5 V

      z17-9 (S1) - Body ground

      R - Body ground

      Rotation angle sensor SIN aspect input signal

      Engine running, steering wheel being turned

      -2.0 to 2.0 V

      z18-1 (TRQG) - Body ground

      - (Not available) - Body ground

      Torque sensor ground

      Always

      Below 1 Ω

      z18-2 (TRQ2) - z18-1 (TRQG)

      - (Not available)

      Torque sensor signal 2

      Engine running, steering wheel not turned (without load)

      2.3 to 2.7 V

      Engine running, steering wheel turned to right with vehicle stopped

      0.95 to 2.5 V

      Engine running, steering wheel turned to left with vehicle stopped

      2.5 to 4.04 V

      z18-3 (TRQV) - z18-1 (TRQG)

      - (Not available)

      Torque sensor power supply

      Ignition switch ON

      8.5 to 11 V

      z18-5 (TRQF) - z18-1 (TRQG)

      - (Not available)

      Torque sensor reference voltage

      Ignition switch ON

      3.28 to 3.32 V

      z18-7 (TRQ1) - z18-1 (TRQG)

      - (Not available)

      Torque sensor signal 1

      Engine running, steering wheel not turned (without load)

      2.3 to 2.7 V

      Engine running, steering wheel turned to right with vehicle stopped

      2.5 to 4.04 V

      Engine running, steering wheel turned to left with vehicle stopped

      0.95 to 2.5 V

      z21-1 (PGND) - Body ground

      B - Body ground

      Power ground

      Always

      Below 1.5 V

      z22-1 (PIG) - Body ground

      R - Body ground

      Motor power supply

      Always

      11 to 14 V

      If the result is not as specified, the ECU may have a malfunction.