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ECM Power Source Circuit: Procedure

  1. INSPECT INTEGRATION RELAY (POWER SOURCE) 
    Fig 1: Identifying Integration Relay Connector
    GTY166894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the integration 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
      1C-1 - Body ground Always 11 to 14 V
    3. Reinstall the integration relay.

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

    OK: Go to next step 

  2. INSPECT INTEGRATION RELAY (AM2 FUSE AND EFI FUSE) 
    Fig 2: Identifying Integration Relay Connector Terminals
    GTY161023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the AM2 fuse and EFI fuse from the integration relay.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      AM2 fuse Always Below 1 Ω
      EFI fuse Always Below 1 Ω
    3. Reinstall the fuses.

    NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  3. INSPECT INTEGRATION RELAY (EFI RELAY AND IG2 RELAY) 
    Fig 3: Identifying 1C, 1B And 1A Connector Terminals
    GTY160909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the integration 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
      1C-1 - 1B-4 When battery voltage not applied 10 kΩ or higher
      When battery voltage applied to terminal 1B-2 - 1B-3 Below 1 Ω
      1C-1 - 1A-4 When battery voltage not applied 10 kΩ or higher
      When battery voltage applied to terminal 1A-2 - 1A-3 Below 1 Ω
      1C-1 - 1B-1 Always Below 1 Ω
    3. Reinstall the integration relay.

    NG → See step   11 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) 
    Fig 4: Identifying Integration Relay And ECM Connector Terminals
    GTY165790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the integration 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
      A21-44 (MREL) - 1A-2 Always Below 1 Ω
      A21-2 (+B) - 1A-4 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A21-44 (MREL) - Body ground Always 10 kΩ or higher
      A21-2 (+B) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    Fig 5: Identifying ECM Connector
    GTY165816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      C19-104 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. INSPECT ECM (IGSW TERMINAL VOLTAGE) 
    Fig 6: Identifying ECM Connector Terminals
    GTY161603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM connectors.
    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
      A21-28 (IGSW) - C19-104 (E1) Ignition switch ON 11 to 14 V
    4. Reconnect the ECM connectors.
      RESULT

      Result Proceed to
      Outside standard range A
      Within standard range B

    B → See step   12 

    A: Go to next step 

  7. INSPECT FUSE (IGN FUSE) 
    Fig 7: Identifying IGN Fuse
    GTY163533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the IGN fuse from the main body ECU.
    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
    3. Reinstall the IGN fuse.

    NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY) 
    Fig 8: Identifying Integration Relay And ECM Connector Terminals
    GTY160818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the integration 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
      A21-28 (IGSW) - 1B-4 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A21-28 (IGSW) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ECM connector.
      RESULT

      Result Proceed to
      Outside standard range A
      Within standard range B

    B → See step   9 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH) 
    Fig 9: Identifying Integration Relay And Ignition Switch Connector Terminals
    GTY160819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the integration 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)

      Tester Connection Condition Specified Condition
      1B-2 - F9-6 (IG2) Always Below 1 Ω
      1B-3 - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      F9-6 (IG2) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ignition switch connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. INSPECT IGNITION SWITCH 
    Fig 10: Identifying Ignition Switch Connector Terminals
    GTY161599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ignition switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      All terminals LOCK 10 kΩ or higher
      2 (ACC) - 4 (AM1) ACC Below 1 Ω
      1 (IG1) - 2 (ACC) - 4 (AM1) ON
      5 (AM2) - 6 (IG2)
      1 (IG1) - 3 (ST1) - 4 (AM1) START
      5 (AM2) - 6 (IG2) - 7 (ST2)
    3. Reinstall the ignition switch.

    NG → See step   13 

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

  11. REPLACE INTEGRATION RELAY. Refer to  REMOVAL 
  12. REPLACE ECM. Refer to  REMOVAL 
  13. REPLACE IGNITION SWITCH. Refer to  REMOVAL 
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