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ECU Power Source Circuit: Procedure

WARNING: This page is about a different car, the 2010 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) 
    1. Disconnect the TCM connector.
      Fig 1: Identifying C56 Connector Terminals
      GTY201935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      +B (C56-18) - E1 (C56-8) 9 to 14 V

    OK → CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Harness And Connector (TCM - Body Ground)
      GTY190557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Specified Condition
      E1 (C56-8) - Body ground Below 1 Ω
    2. Reconnect the TCM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - EFI RELAY) 

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