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Home >> Subaru >> 2020 >> BRZ tS >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Power Steering System (Diagnostics) >> Power Steering System >> P/S Warning Light Remains On >> Inspection steps

Inspection steps

CAUTION: Always perform a steering zero point calibration after replacing the power steering computer ASSY. (Refer to WORK SUPPORT )
NOTE: Before performing troubleshooting, check the fuse for this circuit.
  1. Checking connection of each part
    1. Lightly jiggle the power steering computer ASSY connector and wiring harness in the up/down/left/right directions, and check the state of the P/S warning light.

      Criteria: No variation in the P/S warning light illumination state.

      NOTE: If operating properly, the P/S warning light comes on when the ignition is turned to IG ON and goes out after the engine has started.

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

  2. Diagnosis codes check (CAN communication system)
    1. Use the SSM4 to check the CAN communication system. (Refer to HOW TO TROUBLESHOOT )

      Criteria: No error code.

      OK: Go to next step

      NG: Go to "CAN communication system (How to troubleshoot)"

      (Refer to HOW TO TROUBLESHOOT )

  3. Reading SSM4 data (PIG power supply)
    1. Use the SSM4 to check the [PIG Power Supply]. (Refer to DATA MONITOR )

      SSM4 screen: [Power Steering] →[Select Function] →[Data monitor]

      Item name Description/display range Normal value Remarks
      PIG power supply Indicates the power supply voltage to drive the motor.
      Display range: 0.0000 to 20.1531V      		 9 to 16V: Always -

      Voltage: 9 - 16 V (always)

      OK: Go to next step

      NG: Go to Step  5.

  4. Reading SSM4 data (IG power supply voltage)
    1. Use the SSM4 to check the [Ignition Power Supply Voltage]. (Refer to DATA MONITOR )

      SSM4 screen: [Power Steering] →[Select Function] →[Data monitor]

      Item name Description/display range Normal value Remarks
      [Ignition Power Supply Voltage] Indicates the ECM power supply state.
      Display range: 0.0000 to 20.1531V      		 9 to 16V: IG ON -

      Voltage: 9 - 16 V (When IG ON)

      OK: Go to next step

      NG: Go to Step  6.

      Replacement of the power steering computer ASSY (Refer to POWER STEERING COMPUTER )

  5. Inspection of the wiring harness and connector (PIG power supply and ground)
    1. Disconnect the power steering computer ASSY connector A14.
    2. Measure the voltage and resistance of the connectors on the vehicle harness side.
      VOLTAGE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A14-1(PIG) - Chassis ground Always 9 to 16V
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A14-2 (PGND) - Chassis ground Always Less than 1 Ω
      G12591247Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

      Replacement of the power steering computer ASSY (Refer to POWER STEERING COMPUTER )

  6. Inspection of the wiring harness and connector (IG power supply and ground)
    1. Disconnect the power steering computer ASSY connectors A14 and A15.
    2. Measure the voltage and resistance of the connectors on the vehicle harness side.
      VOLTAGE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A15-6(IG) - Chassis ground IG ON 9 to 16V
      STANDARD VALUE RESISTANCE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A14-2 (PGND) - Chassis ground Always Less than 1 Ω
      G12591248Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

      Replacement of the power steering computer ASSY (Refer to POWER STEERING COMPUTER )

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