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ECM Terminal Arrangement

  1. Inspection of the power steering computer assembly
    1. Check the voltage or resistance between each terminal, as well as between the chassis ground and each terminal.
      CAUTION: This check is performed from the back side of the connector, with the connector hooked up to the computer.
      Fig 1: Power Steering Computer Assembly Connector Terminal Identification
      G10215689Courtesy of SUBARU OF AMERICA, INC.

      Criteria

      CRITERIA SPECIFICATION

      Terminal No. (Symbol) Terminal description Condition Special conditions
      z1-1 (V) [(1)] V phase motor output - -
      z1-2 (U) [(1)] U phase motor output - -
      z1-3 (W) [(1)] W phase motor output - -
      A14-1 (PIG) - A14-2 (PGND) Motor power supply Always 9 to 16 V
      A14-2 (PGND) - Chassis ground Power supply ground Always 1 Ωor less
      A15-6 (IG) - A14-2 (PGND) IG power supply IG SW ON 9 to 16 V
      z2-5 (RZV) - A14-2 (PGND) Rotation angle sensor excitation output signal During engine start, steering operation 0.68 to 4.42 V
      z2-7 (RZG) - A14-2 (PGND) Rotation angle sensor excitation circuit GND Always 1 Ωor less
      z2-13 (RZCS) - A14-2 (PGND) Rotation angle sensor COS phase input signal During engine start, steering operation 0.68 to 4.42 V
      z2-14 (RZSN) - A14-2 (PGND) Rotation angle sensor SIN phase input signal During engine start, steering operation 0.68 to 4.42 V
      z2-8(TRQ1) - z2-11(TRQG) Torque sensor signal 1 During engine start, no steering load (neutral position) 2.3 to 2.7 V
      During engine start, steering to the right (When the vehicle is stopped) 2.3 to 3.8 V
      During engine start, steering to the left (When the vehicle is stopped) 1.2 to 2.7 V
      z2-9(TRQV) - z2-11(TRQG) Torque sensor power supply IG SW ON 4.5 to 5.5 V
      z2-10(TRQ2) - z2-11(TRQG) Torque sensor signal 2 During engine start, no steering load (neutral position) 2.3 to 2.7 V
      During engine start, steering to the right (When the vehicle is stopped) 1.2 to 2.7 V
      During engine start, steering to the left (When the vehicle is stopped) 2.3 to 3.8 V
      z2-11(TRQG) - Chassis ground Torque sensor ground Always 1 Ωor less
      (1) As connector z1 is equipped with a lock lever, it is not possible to check each terminal while the connector is hooked up to the power steering computer assembly.
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