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Terminals Of Ecu

WARNING: This page is about a different car, the 2012 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 
    1. Disconnect the 2B, 2E, 2F and 2G junction block and E51 ECU connectors.
      Fig 1: 2B, 2E, 2F, And 2G Instrument Junction Block Connector Terminal Identification (Front Side)
      GTY206391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: 2B, 2E, 2F And 2G Junction Block And E51 ECU Connector Terminal Identification (Rear Side)
      GTY206589Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      2B-30 (BECU)* - Body ground W - Body ground Battery power supply Always 11 to 14 V
      2F-5 (ACC) - Body ground L - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      2G-1 (IG) - Body ground W - Body ground Battery power supply Engine switch on (IG) 11 to 14 V
      2E-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E51-4 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      • *: w/o Smart Key System

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the 2B, 2E, 2F and 2G junction block and E51 ECU connectors.
    4. Measure the pulse according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      2C-12 (LIN1) - E51-4 (GND2) V - W-B LIN Communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    Fig 3: ECU E36 Connector Terminal Identification
    GTY176915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E36 ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E36-1 (+B) - E36-17 (E) GR - W-B Battery power supply Always 11 to 14 V
      E36-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the E36 ECU connector.
    4. Measure the voltage and pulse according to value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E36-18 (IG) - E36-17 (E) B - W-B Engine switch power supply Engine switch on (IG) 11 to 14 V
      E36-18 (IG) - E36-17 (E) B - W-B Engine switch power supply Engine switch off Below 1 V
      E36-10 (LIN) - E36-17 (E) V - W-B LIN Communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

  3. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) 
    Fig 4: E22 ECU Connector Terminal Identification
    GTY196076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E22 ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E22-1 (+B) - E22-8 (GND) GR - W-B Battery power supply Always 11 to 14 V
      E22-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the E22 ECU connector.
    4. Measure the pulse according to value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E22-3 (LIN1) - E22-8 (GND) V - W-B LIN Communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

  4. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 
    Fig 5: E39 ECU Connector Terminal Identification
    GTY168772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E39 ECU connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E39-7 (B) - E39-1 (GND) L - W-B Battery power supply Always 11 to 14 V
      E39-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E39-6 (IG2) - E39-1 (GND) B - W-B Engine switch power supply Engine switch on (IG) 11 to 14 V
      E39-6 (IG2) - E39-1 (GND) B - W-B Engine switch power supply Engine switch off Below 1 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the E39 ECU connector.
    4. Measure the pulse according to value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E39-5 (LIN) - E39-1 (GND) V - W-B LIN Communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

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