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Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  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 then 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 (See DIAGNOSIS 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) (See DIAGNOSIS SYSTEM ).

      OK: DTCs are not output. 

    NG: GO TO MULTIPLEX COMMUNICATION SYSTEM (BEAN) (SEE  MULTIPLEX COMMUNICATION 

    OK: GO TO NEXT 

  4. INSPECT FUSE (ECU-IG No. 1) 
    1. Remove the ECU-IG No. 1 fuse from the instrument panel J/B LH.
    2. Check for continuity of the ECU-IG No. 1 fuse.

      OK: Continuity 

    NG: REPLACE FUSE 

    OK: GO TO NEXT STEP 

  5. INSPECT POWER STEERING ECU ASSEMBLY 
    1. Disconnect the P41 connector from the power steering ECU assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      Fig 1: Inspecting Power Steering ECU Assembly
      G04113697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      POWER STEERING ECU ASSEMBLY

      Tester connection (Symbols) Condition Specified condition
      P41-9 (IG) -P41-5 (PGND) Ignition switch on 10 to 14 V

    OK: Go to step   7 

    NG: GO TO NEXT STEP 

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

      Resistance 

      Fig 2: Checking Harness And Connector (Between Power Steering ECU Assembly And Body Ground)
      G04113698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      POWER STEERING ECU ASSEMBLY AND BODY GROUND

      Tester connection (Symbols) Condition Specified condition
      P41-5 (PGND) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  7. REPLACE POWER STEERING ECU ASSEMBLY 
    1. Replace the power steering ECU assembly (See REMOVAL  ).
      NOTE: After replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (See 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: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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