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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System (1AR-FE) (Diagnostic Codes (P1604 - U0101) & Circuit Tests)) >> SFI System >> ECM Power Source Circuit >> Procedure

ECM Power Source Circuit: Procedure

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  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch to ON.
      Fig 1: Identifying ECM Connector
      GTY297992Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D61-23 (+B) - B49-6 (E1) Ignition switch ON 11 to 14 V
      D61-24 (+B2) - B49-6 (E1) Ignition switch ON 11 to 14 V

    NG → See step   2 

    OK → See step   15 

  2. 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 (Check for Open)

      Tester Connection Condition Specified Condition
      B49-6 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch to ON.
      Fig 2: Identifying ECM Connector
      GTY297997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D60-36 (MREL) - B49-6 (E1) Ignition switch ON 11 to 14 V

    NG → See step   8 

    OK: Go to next step 

  4. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (EFI RELAY) 
    1. Inspect the EFI relay, refer to INSPECTION .

    NG → See step   16 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM) 
    1. Remove the engine room junction block assembly 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
      2E-9 - D60-36 (MREL) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      2E-9 or D60-36 (MREL) - Body ground Always 10 kΩ or higher
    4. Reinstall the engine room junction block assembly.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (EFI RELAY - BODY GROUND) 
    1. Remove the engine room junction block assembly 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
      2E-10 - Body ground Always Below 1 Ω
    3. Reinstall the engine room junction block assembly.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM) 
    1. Remove the engine room junction block assembly 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
      2E-6 - D61-23 (+B) Always Below 1 Ω
      2E-6 - D61-24 (+B2) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      2E-6 or D61-23 (+B) - Body ground Always 10 kΩ or higher
      2E-6 or D61-24 (+B2) - Body ground Always 10 kΩ or higher
    4. Reinstall the engine room junction block assembly.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  8. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch to ON.
      Fig 3: Identifying ECM Connector
      GTY297996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D60-21 (IGSW) - B49-6 (E1) Ignition switch ON 11 to 14 V

    NG → See step   9 

    OK → See step   17 

  9. CHECK HARNESS AND CONNECTOR (ECM - IG2 RELAY) 
    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

      Tester Connection Condition Specified Condition
      IG2 relay terminal 3 - D60-21 (IGSW) Always Below 1 Ω
    4. Reconnect the ECM connector.
    5. Reinstall the IG2 relay.

    NG → See step   13 

    OK: Go to next step 

  10. INSPECT RELAY (IG2 RELAY) 
    1. Remove the IG2 relay from the engine room relay block.
      Fig 4: Identifying Relay Test Terminals
      GTY100961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Battery voltage applied between terminals 1 and 2 Below 1 Ω
    3. Reinstall the IG2 relay.

    NG → REPLACE RELAY (IG2 RELAY) 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (IG2 RELAY POWER SOURCE) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      IG2 relay terminal 5 - Body ground Always 11 to 14 V
    3. Reinstall the IG2 relay.

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

    OK: Go to next step 

  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

      Tester Connection Condition Specified Condition
      IG2 relay terminal 2 - Body ground Always Below 1 Ω
    3. Reinstall the IG2 relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - IG2 RELAY) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Disconnect the ignition switch assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      D24-6 (IG2) - IG2 relay terminal 1 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      D24-6 (IG2) or IG2 relay terminal 1 - Body ground Always 10 kΩ or higher
    4. Reinstall the IG2 relay.
    5. Reconnect the ignition switch assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  14. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Inspect the ignition switch assembly, refer to INSPECTION .

    NG → See step   18 

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

  15. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  16. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL 
  17. REPLACE ECM. Refer to  REMOVAL 
  18. REPLACE IGNITION SWITCH ASSEMBLY. Refer to  REMOVAL 
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