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Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Steering >> Manual Steering >> Power Steering >> Electronic Power Steering System >> IG Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR 
    1. Check the indication condition of the P/S warning light while by wiggling the power steering ECU assembly connector and wire harness up and down, and right and left.

      OK: 

      P/S warning light indication condition does not change. 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  2. INSPECT CAN COMMUNICATION SYSTEM 
    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system.

      OK: 

      DTCs are not output. 

    NG: GO TO  CAN COMMUNICATION SYSTEM

    OK: Go to next step. 

  3. INSPECT MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the multiplex communication system (BEAN).

      OK: 

      DTCs are not output. 

    NG:  GO TO MULTIPLEX COMMUNICATION SYSTEM (BEAN)

    OK: Go to next step. 

  4. INSPECT FUSE (ECU-IG LH) 
    1. Remove the ECU-IG LH fuse from the cowl side J/B LH.
    2. Check for continuity of the ECU-IG LH fuse.

      OK: 

      Continuity 

    NG: REPLACE FUSE 

    OK: Go to next step 

  5. INSPECT POWER STEERING ECU ASSEMBLY 
    1. Disconnect the A23 connector from the power steering ECU assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE SPECIFICATION

      Tester connection (Symbols) Condition Specified condition
      A23-9 (IG) - A23-5 (PGND) Engine switch on (IG) 10 to 14 V
    Fig 1: Identifying A23 Power Steering ECU Assembly Connector Terminals
    G05297643Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  7

    NG: Go to next step. 

  6. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATION

      Tester connection (Symbols) Condition Specified condition
      A23-5 (PGND) - Body ground Always Below 1 Ω
    Fig 2: Identifying A23 Power Steering ECU Assembly Connector Terminals
    G05297644Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER STEERING ECU ASSEMBLY -BATTERY) 

  7. REPLACE POWER STEERING ECU ASSEMBLY 
    NOTE: If replacing the power steering ECU assembly, initialize the rotation angle sensor and calibrate the torque sensor zero point (see page CALIBRATION ).
  8. CHECK P/S WARNING LIGHT 
    1. Check the P/S warning light status on the combination meter.

      Standard: 

      The P/S warning light is off. 

    OK: END 

    NG: REPLACE PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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