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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 63 (Engine Control System (2GR-FE) (Diagnostic Codes (P1604 - P2610) & Circuit Tests))) >> SFI System >> ECM Power Source Circuit >> Procedure

ECM Power Source Circuit: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch on (IG).
      Fig 1: Identifying Ignition Switch On (IG)
      GTY296155Courtesy 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
      D61-22 (+B) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V
      D61-23 (+B2) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (ECM)

    NG → See step   2 

    OK → See step   18 

  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
      B49-12 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.

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

    OK: Go to next step 

  3. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch on (IG).
      Fig 2: Identifying Ignition Switch On (IG)
      GTY296157Courtesy 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
      D61-9 (MREL) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (ECM)

    NG → See step   8 

    OK: Go to next step 

  4. CHECK FUSE (EFI MAIN AND EFI NO. 2 FUSE) 
    1. Remove the EFI MAIN and EFI No. 2 fuse from the engine room relay block.
      Fig 3: Identifying EFI MAIN And EFI No. 2 Fuse
      GTY296792Courtesy 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
      EFI MAIN fuse Always Below 1 Ω
      EFI No. 2 fuse Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block
    3. Reinstall the fuses.

    NG → REPLACE FUSE (EFI MAIN OR EFI NO. 2 FUSE) 

    OK: Go to next step 

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

    NG → See step   19 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) 
    1. Remove the engine room junction block 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 

      Check for short 

      Tester Connection Condition Specified Condition
      2E-9 (EFI relay terminal) - D61-9 (MREL) Always Below 1 Ω
      2E-10 (EFI relay terminal) - Body ground Always Below 1 Ω
      Tester Connection Condition Specified Condition
      2E-9 (EFI relay terminal) or D61-9 (MREL) - Body ground Always 10 kΩ or higher
    4. Reinstall the engine room junction block.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - ECM) 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM) 
    1. Remove the engine room junction block 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 

      Check for short 

      Tester Connection Condition Specified Condition
      2E-6 (EFI relay terminal) - D61-22 (+B) Always Below 1 Ω
      2E-6 (EFI relay terminal) - D61-23 (+B2) Always Below 1 Ω
      Tester Connection Condition Specified Condition
      2E-6 (EFI relay terminal) or D61-22 (+B) - Body ground Always 10 kΩ or higher
      2E-6 (EFI relay terminal) or D61-23 (+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 (EFI RELAY - ECM) 

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

  8. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch on (IG).
      Fig 4: Identifying Ignition Switch On (IG)
      GTY305631Courtesy 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) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (ECM)

    NG → See step   9 

    OK → See step   20 

  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 IG2 RELAY 
    1. Remove the IG2 relay from the engine room relay block.
      Fig 5: 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 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      When battery voltage applied to terminals 1 and 2 Below 1 Ω
    3. Reinstall the IG2 relay.

    NG → REPLACE 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.
      Fig 6: Identifying IG2 Relay From The Engine Room Relay Block
      GTY303512Courtesy 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 Switch Condition Specified Condition
      5 - Body ground Ignition switch on (IG) 9 to 14 V
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block
      *2 IG2 Relay
    4. Reinstall the IG2 relay.

    NG → See step   14 

    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.
      Fig 7: Identifying IG2 Relay In Engine Room Relay Block
      GTY183601Courtesy 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
      2 - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block
      *2 IG2 Relay
    3. Reinstall the IG2 relay.

      Result

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

    B → See step   15 

    C → See step   17 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND) 

  13. CHECK FUSE (IG2 FUSE) 
    1. Remove the IG2 fuse from the engine room relay block.
      Fig 8: Identifying IG2 Fuse
      GTY306685Courtesy 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
      IG2 fuse Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block
    3. Reinstall the IG2 fuse

    NG → REPLACE FUSE (IG2 FUSE) 

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

  14. CHECK FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the instrument panel junction block.
      Fig 9: Identifying IGN Fuse In Engine Room Relay Block
      GTY172418Courtesy 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
      IGN fuse Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Junction Block
    3. Reinstall the IGN fuse.

    NG → REPLACE FUSE (IGN FUSE) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - ECM) 

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

      Standard resistance

      Check for open 

      Check for short 

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

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

    OK: Go to next step 

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

    NG → See step   21 

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

  17. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - MAIN BODY ECU) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Remove the instrument panel junction block (main body ECU).
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Condition Specified Condition
      IG2 relay holder terminal (1) - D7-11 (IG2D) Always Below 1 Ω
      IG2 relay holder terminal (2) - Body ground Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      D7-11 (IG2D) - Body ground Always 10 kΩ or higher
    4. Reinstall the IG2 relay.
    5. Reconnect the main body ECU connector.

    NG → See step   22 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  19. REPLACE ENGINE ROOM JUNCTION BLOCK. Refer to  COMPONENTS 
  20. REPLACE ECM. Refer to  COMPONENTS 
  21. REPLACE IGNITION SWITCH. Refer to  COMPONENTS 
  22. CHECK SMART KEY SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
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