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HOMESERVICE MANUALSSCION2008XD AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCE2ZR-FE ENGINE CONTROL SYSTEMSFI SYSTEMECM POWER SOURCE CIRCUITINSPECTION PROCEDURE
2008 Scion xD Automatic

Inspection Procedure

2008 Scion xD AutomaticSECTION 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
      1C-1 - Body ground Always 11 to 14 V
    3. Reinstall the integration relay.

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

    Fig 1: Identifying Integration Relay Connector
    G05398661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. INSPECT INTEGRATION RELAY (AM2 FUSE AND EFI FUSE) 
    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 

      RESISTANCE SPECIFICATION

      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 

    Fig 2: Identifying Integration Relay Connector Terminals
    G05398662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. INSPECT INTEGRATION RELAY (EFI 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
      1C-1 - 1B-4 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminal 1B-2 - 1B-3 Below 1 Ω
      1C-1 - 1A-4 When battery voltage absent 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
      Fig 3: Identifying Integration Relay Connector Terminals
      G05398663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the integration relay.

    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

      Tester Connection Condition Specified Condition
      A2-M4 (MREL) - 1A-2 Always Below 1 Ω
      A21-2 (+B) - 1A-4 Always Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION

      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 

    Fig 4: Identifying Integration Relay And ECM Connector Terminals
    G05398664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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

      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 

    Fig 5: Identifying ECM Connector
    G05398665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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
      A21-28 (IGSW) - C19-104 (E1) Ignition switch ON 11 to 14V
    4. Reconnect the ECM connectors.

      Result 

      RESULT REFERENCE

      Result Proceed to
      Outside standard range A
      Within standard range B

    B : REPLACE ECM  (See REMOVAL  )

    Fig 6: Identifying ECM Connector Terminals
    G05398666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A: Go to next step 

  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.

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

    Fig 7: Identifying IGN Fuse
    G05398667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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

      Tester Connection Condition Specified Condition
      A21-28 (IGSW) - 1B-4 Always Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION

      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 REFERENCE

      Result Proceed to
      Outside standard range A
      Within standard range B

    B: Go to step 9 

    Fig 8: Identifying Integration Relay And ECM Connector Terminals
    G05398668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A : REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. 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

      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) 

      RESISTANCE SPECIFICATION

      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 

    Fig 9: Identifying Integration Relay And Ignition Switch Connector Terminals
    G05398669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  10. INSPECT IGNITION SWITCH 
    1. Remove the ignition switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      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: REPLACE IGNITION SWITCH  (See REMOVAL )

    Fig 10: Identifying Ignition Switch Connector Terminals
    G05398670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.