LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Scion >> 2009 >> xB Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2AZ-FE Engine Control System - System And Circuit Testing, On-Vehicle Inspection, Removal, Inspection & Installation >> ECM Power Source Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. INSPECT INTEGRATION RELAY (POWER SOURCE) 
    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 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      1E-1 - Body ground Always 11 to 14 V
    3. Reinstall the integration relay.
      4. Fig 1: Identifying Integration Relay Connector
      G05386857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY BATTERY) 

    OK: Go to next step 

  2. INSPECT FUSES (EFI MAIN, IG2, AND EFI NO. 1 FUSES) 
    1. Remove the EFI MAIN fuse, IG2 fuse and EFI NO. 1 fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      EFI MAIN fuse Always Below 1 Ω
      IG2 fuse
      EFI NO. 1 fuse
    3. Reinstall the fuses.
      4. Fig 2: Identifying EFI MAIN Fuse, IG2 Fuse And EFI No. 1 Fuse
      G05386858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 MAIN RELAY AND IG2 RELAY) 
    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 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      1E-1 - 1B-4 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminals 1B-2 and 1B-3 Below 1 Ω
      1E-1 - 1A-4 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminals 1A-2 and 1A-3 Below 1 Ω
    3. Reinstall the integration relay.
      4. Fig 3: Identifying EFI Main Relay Connector Terminals
      G05386859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE INTEGRATION RELAY  (See REMOVAL  )

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) 
    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) 

      RESISTANCE SPECIFICATION - CHECK FOR OPEN

      Tester Connection Condition Specified Condition
      A36-44 (MREL) - 1B-2 Always Below 1 Ω
      A36-2 (+B) - 1B-4 Always Below 1 Ω
      A36-1 (+B2) - 1B-4 Always Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION - CHECK FOR SHORT

      Tester Connection Condition Specified Condition
      A36-44 (MREL) - Body ground Always 10 kΩ or higher
      A36-2 (+B) - Body ground Always 10 kΩ or higher
      A36-1 (+B2) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ECM connector.
      6. Fig 4: Identifying ECM And Integration Relay Connector Terminals
      G05386860Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. 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) 

      RESISTANCE SPECIFICATION - CHECK FOR OPEN

      Tester Connection Condition Specified Condition
      B33-104 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.
      4. Fig 5: Identifying ECM Connector
      G05386861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. INSPECT ECM (IGSW TERMINAL VOLTAGE) 
    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 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A36-28 (IGSW) - B33-104 (E1) Ignition switch ON 11 to 14 V
    4. Reconnect the ECM connectors.
      5. Fig 6: Identifying ECM Connector Terminals
      G05386862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 7 

    OK : REPLACE ECM  (See REMOVAL  )

  7. INSPECT FUSE (IGN FUSE) 
    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 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      IGN fuse Always Below 1 Ω
    3. Reinstall the IGN fuse.
      4. Fig 7: Identifying IGN Fuse
      G05386863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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) 
    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) 

      RESISTANCE SPECIFICATION - CHECK FOR OPEN

      Tester Connection Condition Specified Condition
      A36-28 (IGSW) - 1A-4 Always Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION - CHECK FOR SHORT

      Tester Connection Condition Specified Condition
      A36-28 (IGSW) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ECM connector.
      6. Fig 8: Identifying ECM And Integration Relay Connector
      G05386864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. INSPECT FUSE (IG2 NO. 2 FUSE) 
    1. Remove the IG2 NO. 2 fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      IG2 NO. 2 fuse Always Below 1 Ω
    3. Reinstall the fuse.
      4. Fig 9: Identifying IG2 No. 2 Fuse
      G05386865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH) 
    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) 

      RESISTANCE SPECIFICATION - CHECK FOR OPEN

      Tester Connection Condition Specified Condition
      1A-2 - C5-6 (IG2) Always Below 1 Ω
      1A-3 - Body ground Always Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION - CHECK FOR SHORT

      Tester Connection Condition Specified Condition
      C5-6 (IG2) - Body ground Always 10 kΩ or higher
    4. Reinstall the integration relay.
    5. Reconnect the ignition switch connector.
      6. Fig 10: Identifying Ignition Switch Connector Terminals
      G05386866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. INSPECT IGNITION SWITCH 
    1. Remove the ignition switch.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 11: Inspecting Ignition Switch
      G05386867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      All Terminals LOCK 10 kΩ or higher
      2 (AM1) - 3 (ACC) ACC Below 1 Ω
      2 (AM1) - 3 (ACC) - 4 (IG1) ON
      7 (AM2) - 6 (IG2)
      2 (AM1) - 4 (IG1) - 1 (ST1) START
      7 (AM2) - 6 (IG2) - 8 (ST2)
    3. Reinstall the ignition switch.

    NG : REPLACE IGNITION SWITCH  (See REMOVAL )

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

scientia non olet · About LEMON Manuals