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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> Power Steering ECU Communication Stop Mode >> Inspection Procedure

Inspection Procedure

  1. CHECK OPEN IN CAN BUS WIRE (POWER STEERING ECU BRANCH LINE) 
    1. Turn the engine switch off.
    2. Disconnect the power steering ECU connector (A31).
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      A31-2 (CANH) - A31-3 (CANL) Engine switch off 54 to 69 Ω
      Fig 1: Identifying Power Steering ECU Connector A31
      G05828587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE POWER STEERING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

      OK: Go to Next Step 

  2. CHECK WIRE HARNESS (IG, PGND) 
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      A31-5 (PGND) - Body ground Always Below 1 Ω
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      A31-9 (IG) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 2: Identifying Power Steering ECU Connector A31 (IG, PGND)
      G05828588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE POWER STEERING ECU 

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