ECM terminal arrangement

Inspect 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 Terminal Layout

Courtesy of SUBARU OF AMERICA, INC.

CRITERIA

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 - 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 - 16 V

z2-5 (RZV) - A14-2 (PGND)

Rotation angle sensor excitation output signal

During engine start, steering operation

0.68 - 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 - 4.42 V

z2-14 (RZSN) - A14-2 (PGND)

Rotation angle sensor SIN phase input signal

During engine start, steering operation

0.68 - 4.42 V

z2-8(TRQ1) - z2-11(TRQG)

Torque sensor signal 1

During engine start, no steering load (neutral position)

2.3 - 2.7 V

During engine start, steering to the right (When the vehicle is stopped)

2.3 - 3.8 V

During engine start, steering to the left (When the vehicle is stopped)

1.2 - 2.7 V

z2-9(TRQV) - z2-11(TRQG)

Torque sensor power supply

IG SW ON

4.5 - 5.5 V

z2-10(TRQ2) - z2-11(TRQG)

Torque sensor signal 2

During engine start, no steering load (neutral position)

2.3 - 2.7 V

During engine start, steering to the right (When the vehicle is stopped)

1.2 - 2.7 V

During engine start, steering to the left (When the vehicle is stopped)

2.3 - 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.