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Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE) 
    1. Disconnect the P2 and P5 ECU connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    P2-23 (MPX1) - P5-5 (S1) Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying P2 And P5 ECU Connector End View Terminal
    G05764784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TELEPHONE ECU ASSEMBLY - VEHICLE BATTERY AND BODY GROUND) 
    1. Disconnect the P2 ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

    Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    P2-1 (+B) - Body ground Always 11 to 14 V

    Standard Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    P2-12 (E) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying P2 ECU Connector End View Terminal
    G05764785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY 

    NEXT: PERFORM REGISTRATION  (See REGISTRATION )

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