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Inspection Procedure

NOTE:
  • Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any switches, or any doors triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.

  1. CHECK OPEN IN CAN BUS WIRE (ECU MAIN BUS WIRE) 
    1. Disconnect ECM connector (E5).
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      OPEN IN CAN BUS WIRE (ECU MAIN BUS WIRE) RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E5-33 (CANH) - E5-34 (CANL) Ignition Switch off 108 to 132 Ω
      Fig 1: Identifying ECM Connector (E5)
      G05143345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

    OK: Go to Next Step 

  2. CHECK WIRE HARNESS (E1, BATT, +BM, IGSW) 
    1. Disconnect the ECM connector (E11).
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS (E1, BATT, +BM, IGSW) RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E1(E11-1)-Body ground Always Below 1 Ω
      Fig 2: Identifying ECM Connector (E11)
      G05143346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the ECM connector (E4).
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      WIRE HARNESS (E1, BATT, +BM, IGSW) VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      +B (E4-1) - Body ground ignition Switch off 9 to 14V
      +B2 (E4-2) - Body ground Ignition Switch off 9 to 14 V
      IGSW (E4-9) - Body ground Ignition Switch on 9 to 14 V
      Fig 3: Identifying ECM Connector (E4)
      G05143347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK ECM POWER SOURCE CIRCUIT  (See ECM POWER SOURCE CIRCUIT )

    OK: REPLACE ECM  (See REMOVAL )

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