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Inspection Procedure

  1. CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the K45 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      K45 - 1 (IG) - Body ground Power switch ON (IG) 10 to 14 V

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      K45-7 (GND) - Body ground Below 1 Ω
      Fig 1: Identifying K45 ECU Connector Terminals
      G05312213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO Next Step 

  2. CHECK RESISTANCE OF COMMUNICATION LINE 
    Fig 2: Identifying K66 Network Gateway ECU And K31 Combination Meter Connector Terminals
    G05312214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K45 ECU connector.
    2. Disconnect the K66 network gateway ECU and K31 combination meter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      K45-6 (MPX1) - K31-5 (MPX-) Below 1 Ω
      K45 - 12 (MPX2) - K66-4 (MPI1) 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE TIRE PRESSURE WARNING ECU 

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