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ECM Power Source Circuit [12/2015 - 08/2016]: Procedure

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  1. 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
      B1-81 (E1) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. INSPECT ECM (IGSW VOLTAGE) 
    1. Disconnect the ECM connector.
      GTY731800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A39-28 (IGSW) - Body ground Ignition switch ON 11 to 14 V
      RESULT

      Result Proceed to
      OK A
      NG
      (w/ Smart Key System)      		 B
      NG
      (w/o Smart Key System)      		 C
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  14

    Result: 

    A 

    See step  3

  3. INSPECT ECM (MREL VOLTAGE) 
    1. Remove the EFI MAIN relay.
      GTY299597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      1 (EFI MAIN relay holder) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a EFI MAIN relay terminal

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. INSPECT EFI MAIN RELAY 
    1. Inspect the EFI MAIN relay (Refer to PROCEDURE - Step 1 ).

    Result: 

    NG 

    REPLACE EFI MAIN RELAY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY) 
    1. Remove the EFI MAIN relay from the engine room relay block.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      3 (EFI MAIN relay holder) - A39-3 (+B) Always Below 1 Ω
      3 (EFI MAIN relay holder) - A39-2 (+B2) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      3 (EFI MAIN relay holder) or A39-3 (+B) - Body ground Always 10 kΩ or higher
      3 (EFI MAIN relay holder) or A39-2 (+B2) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (BATTERY - EFI MAIN RELAY) 
    1. Remove the EFI MAIN relay from the engine room relay block.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Disconnect the cable from the positive (+) battery terminal.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      5 (EFI MAIN relay holder) - Battery positive (+) terminal Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      5 (EFI MAIN relay holder) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - BODY GROUND) 
    1. Remove the EFI MAIN relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      2 (EFI MAIN relay holder) - Body ground Always Below 1 Ω

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY TERMINAL - ECM) 
    1. Disconnect the ECM connector.
    2. Remove the EFI MAIN relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A39-34 (MREL) - 1 (EFI MAIN relay holder) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A39-34 (MREL) or 1 (EFI MAIN relay holder) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) 

  9. INSPECT IG2 RELAY 
    1. Inspect the IG2 relay (Refer to PROCEDURE - Step 4 ).

    Result: 

    NG 

    REPLACE IG2 RELAY 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (IG2 RELAY - ECM) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      3 (IG2 relay holder) - A39-28 (IGSW) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      3 (IG2 relay holder) or A39-28 (IGSW) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (IG2 RELAY POWER SOURCE) 
    1. Remove the IG2 relay from the engine room relay block.
      GTY294674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (IG2 relay holder) - Body ground Always 11 to 14 V
      TEXT IN ILLUSTRATION

      *a IG2 relay terminal

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BATTERY) 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      2 (IG2 relay holder) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (IG2 RELAY - POWER MANAGEMENT CONTROL ECU) 
    1. Disconnect the power management control ECU connector.
    2. Remove the IG2 relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      1 (IG2 relay holder) - A35-8 (IG2D) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      1 (IG2 relay holder) - A35-8 (IG2D) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    GO TO SMART KEY SYSTEM 

    (Refer to PROBLEM SYMPTOMS TABLE [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Inspect the ignition switch assembly (Refer to INSPECTION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPLACE IGNITION SWITCH ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM) 
    1. Disconnect the ignition switch assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      D27-6 (IG2) - A39-28 (IGSW) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      D27-6 (IG2) or A39-28 (IGSW) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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