POWER STEERING SYSTEM TERMINALS OF ECU

  1. CHECK POWER STEERING ECU ASSEMBLY

    C240518C17

    *a

    Component without harness connected

    (Power Steering ECU Assembly)

    -

    -

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

      Note:

      • Check if the power steering ECU assembly connectors are securely connected by pulling on them from the backside.

      • If the EPS warning light is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU's terminals to become 0 V.

      Terminals No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E5-1 (IG) - Body ground

      L*1,G*2 - Body ground

      IG power source voltage

      Ignition switch ON

      8 to 16 V

      E5-6 (TS) - Body ground

      GR - Body ground

      Test mode signal

      Always

      9 to 16 V

      E5-7 (CANH) - E5-8 (CANL)

      GR - W

      CAN communication line

      Ignition switch off

      54 to 69 Ω

      z4-1 (TRQ2) - z4-2 (TRQG)

      Y - B

      Torque sensor 2 input signal

      Engine running and steering wheel not being turned (without load)

      2.3 to 2.7 V

      Engine running and steering wheel being turned to right with vehicle stopped

      1.2 to 2.5 V

      Engine running and steering wheel being turned to left with vehicle stopped

      2.5 to 3.8 V

      z4-2 (TRQG) - Body ground

      B - Body ground

      Torque sensor ground

      Always

      Below 1 Ω

      z4-8 (TRQV) - z4-2 (TRQG)

      R - B

      Torque sensor power source

      Ignition switch ON

      4.5 to 5.5 V

      z4-9 (TRQ1) - z4-2 (TRQG)

      W - B

      Torque sensor 1 input signal

      Engine running and steering wheel not being turned (without load)

      2.3 to 2.7 V

      Engine running and steering wheel being turned to right with vehicle stopped

      2.5 to 3.8 V

      Engine running and steering wheel being turned to left with vehicle stopped

      1.2 to 2.5 V

      z5-1 (M1) - Body ground

      R - Body ground

      Power steering motor assembly output signal 1

      Engine running and steering wheel being turned to right

      9 to 16 V

      Engine running and steering wheel being turned to left

      6 to 8 V

      z5-2 (M2) - Body ground

      B - Body ground

      Power steering motor assembly output signal 2

      Engine running and steering wheel being turned to right

      6 to 8 V

      Engine running and steering wheel being turned to left

      9 to 16 V

      E6-1 (PIG) - Body ground

      B - Body ground

      Power steering motor assembly power supply input signal

      Always

      9 to 16 V

      E6-2 (PGND) - Body ground

      W-B - Body ground

      Power ground

      Always

      Below 1 Ω

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

      *1: w/ Stop and Start System

      *2: w/o Stop and Start System