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ECM Power Source Circuit [06/2018 - 01/2019]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF NO. 1 INTEGRATION RELAY) 
    1. Disconnect the No. 1 integration relay connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1A-10 - Body ground Always 11 to 14 V
      1B-3 - Body ground Always 11 to 14 V
      1B-5 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 1 INTEGRATION RELAY) 

    Result: 

    OK 

    See step  2

  2. INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY, IG2 NO. 1 RELAY) 
    1. Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).

      Refer to INSPECTION [06/2018 - 01/2019]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) 
    1. Disconnect the No. 1 integration relay connector.
    2. Disconnect the ECM connector.
    3. Remove the EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      HINT: 

      Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

    4. Remove the VVT relay from No. 2 relay block assembly.

      HINT: 

      Remove the VVT relay connected between the checked terminals as the coil inside the relay influences the measurement value.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1A-9 - A47-2 (IGSW) Always Below 1 Ω
      1B-6 - A47-15 (MREL) Always Below 1 Ω
      1B-4 - A47-9 (+B) Always Below 1 Ω
      1B-4 - A47-35 (+B2) Always Below 1 Ω
      1A-9 or A47-2 (IGSW) - Body ground and other terminals Always 10 kΩ or higher
      1B-6 or A47-15 (MREL) - Body ground and other terminals Always 10 kΩ or higher
      1B-4 or A47-9 (+B) - Body ground and other terminals Always 10 kΩ or higher
      1B-4 or A47-35 (+B2) - Body ground and other terminals Always 10 kΩ or higher

      HINT: 

      If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A47-10 (E1) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND) 
    1. Disconnect the No. 1 integration relay connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1A-8 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE) 
    GTY850820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to ECM)
    1. Disconnect the ECM connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A47-2 (IGSW) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Result Proceed to
      OK A
      NG B

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 01/2019] 

    Result: 

    B 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INTEGRATION RELAY) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the No. 1 integration relay connector.
    3. Disconnect the instrument panel junction block assembly 4F connector.

      HINT: 

      Disconnect the IG1-NO. 1, IG1-NO. 2 and IG2-NO. 2 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I1-15 (IG1D) - 1A-7 Always Below 1 Ω
      I1-15 (IG1D) or 1A-7 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO SMART ENTRY AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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