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ECM Power Source Circuit: Procedure

  1. INSPECT INTEGRATION RELAY (POWER SOURCE) 
    Fig 1: Identifying Integration Relay On Engine Room Relay Block & Connector Terminals
    GTY388346Courtesy 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
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block
      *a Front view of harness connector
      (to Integration Relay)

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

    OK: Go to next step 

  2. INSPECT INTEGRATION RELAY (EFI RELAY AND IG2 RELAY) 
    Fig 2: Measuring Resistance Of Integration Relay Connector
    GTY385080Courtesy 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
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Connector side of Integration Relay)

    NG → See step   9 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) 
    1. Remove the integration relay from the engine room relay block.
    2. Disconnect the A21 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A21-44 (MREL) - 1A-2 Always Below 1 Ω
      A21-2 (+B) - 1A-4 Always Below 1 Ω
      A21-1 (+B2) - 1A-4 Always Below 1 Ω
      A21-44 (MREL) or 1A-2 - Body ground Always 10 kΩ or higher
      A21-2 (+B) or 1A-4 - Body ground Always 10 kΩ or higher
      A21-1 (+B2) or 1A-4 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the C19 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C19-105 (E1) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT ECM (IGSW TERMINAL VOLTAGE) 
    Fig 3: ECM Connector Terminal Identification
    GTY389115Courtesy 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
      A21-27 (IGSW) - C19-105 (E1) Ignition switch ON 11 to 14 V
      RESULT

      Result Proceed to
      Outside standard range A
      Within standard range B
      TEXT IN ILLUSTRATION

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

    B → See step   10 

    A: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY) 
    1. Remove the integration relay from the engine room relay block.
    2. Disconnect the A21 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A21-27 (IGSW) - 1B-4 Always Below 1 Ω
      A21-27 (IGSW) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH - BODY GROUND) 
    1. Remove the integration relay from the engine room relay block.
    2. Disconnect the F9 ignition switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1B-2 - F9-6 (IG2) Always Below 1 Ω
      1B-3 - Body ground Always Below 1 Ω
      1B-2 or F9-6 (IG2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. INSPECT IGNITION SWITCH 
    Fig 4: Measuring Resistance Of Ignition Switch Connector
    GTY387956Courtesy 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)
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Ignition Switch)

    NG → See step   11 

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

  9. REPLACE INTEGRATION RELAY. Refer to  REMOVAL 
  10. REPLACE ECM. Refer to  REMOVAL 
  11. REPLACE IGNITION SWITCH. Refer to  REMOVAL 
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