POWER STEERING SYSTEM TERMINALS OF ECU


  1. CHECK POWER STEERING ECU

    A002OXHE02

    Tech Tips

    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.