2005 Scion xA AutomaticFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

    Standard: 

    E4 AND E6 ECM CONNECTORS VOLTAGE SPECIFICATIONS

    Tester Connections Specified Conditions
    +B (E6-1) - E1 (E4-7) Between 9 V and 14 V
    Fig 1: Measuring Voltage Between Terminals Of E4 & E6 ECM Connectors
    G03196331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : REPLACE ECM (See  REPLACEMENT  ) 
    2. NG : GO TO NEXT STEP 
  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the negative battery cable.
    2. Disconnect the E4 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      E4 AND E6 ECM CONNECTORS RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      E1 (E4-7) - Body ground Below 1 Ω
    4. Reconnect the ECM connector.
    5. Reconnect the negative battery cable.
      Fig 2: Disconnecting E4 ECM Connector
      G03196332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  3. INSPECT IGNITION OR STARTER SWITCH ASSY 
    1. Disconnect the I10 ignition switch connector.
    2. Check the resistance.
      I10 IGNITION SWITCH CONNECTOR RESISTANCE SPECIFICATIONS

      Ignition Switch Positions Tester Connections Specified Conditions
      LOCK All Terminals 10 kΩ or higher
      ACC 1-3 Below 1 Ω
      ON 1-2, 1-3, 2-3, 5-6 Below 1 Ω
      START 4-5, 4-6, 5-6, 1-2 Below 1 Ω
    3. Reconnect the ignition switch connector.
      Fig 3: Disconnecting I10 Ignition Switch Connector
      G03196333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE IGNITION OR STARTER SWITCH ASSY 
    2. OK : GO TO NEXT STEP 
  4. CHECK FUSE (EFI FUSE} 
    1. Remove the EFI fuse from the engine room R/B.
    2. Check the EFI fuse resistance.

      Standard: Below 1 Ω 

    3. Reinstall the EFI fuse.
      Fig 4: Removing EFI Fuse From Engine Room R/B
      G03196334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 
    2. OK : GO TO NEXT STEP 
  5. INSPECT EFI RELAY 
    1. Remove the EFI relay from the engine room R/B.
    2. Check the EFI relay resistance. Standard:
      EFI RELAY RESISTANCE SPECIFICATIONS

      Tester Connections Specified Conditions
      3 - 5 10 KΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the EFI relay.
      Fig 5: Checking EFI Relay Resistance
      G03196335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE EFI RELAY 
    2. OK : GO TO NEXT STEP 
  6. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) 
    1. Check the harness and connector between the EFI relay and ECM.
      1. Remove the EFI relay from the engine room R/B.
      2. Disconnect the E6 ECM connector.
      3. Check the resistance.

        Standard (Check for open): 

        RESISTANCE SPECIFICATIONS FOR OPEN

        Tester Connections Specified Conditions
        EFI relay (3) -+B (E6-1) Below 1 Ω

        Standard (Check for short): 

        RESISTANCE SPECIFICATIONS FOR SHORT

        Tester Connections Specified Conditions
        EFI relay (3) or +B (E6-1) - Body ground 10 kΩ or higher
        Fig 6: Removing EFI Relay From Engine Room R/B
        G03196336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Reinstall the EFI relay.
      5. Reconnect the ECM connector.
    2. Check the harness and connector between the EFI relay and body ground.
      1. Remove the EFI relay from the engine room R/B.
      2. Check the resistance.

        Standard (Check for open): 

        RESISTANCE SPECIFICATIONS FOR OPEN

        Tester Connections Specified Conditions
        EFI relay (1) - Body ground Below 1 Ω
      3. Reinstall the EFI relay.
        Fig 7: Disconnecting E6 ECM Connector
        G03196337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  7. CHECK FUSE (AM2 FUSE) 
    1. Remove the AM2 fuse from the engine room R/B.
    2. Check the AM2 fuse resistance.

      Standard: Below 1 Ω 

    3. Reinstall the AM2 fuse.
      Fig 8: Removing AM2 Fuse From Engine Room R/B
      G03196338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 
    2. OK : GO TO NEXT STEP 
  8. CHECK HARNESS AND CONNECTOR (EFI RELAY - EFI FUSE) 
    1. Remove the EFI relay from the engine room R/B.
    2. Remove the EFI fuse from the engine room R/B.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      EFI relay (5) - EFI fuse (2) Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified Conditions
      EFI relay (5) - EFI fuse (2) - Body ground 10 kΩ or higher
      Fig 9: Removing EFI Relay From Engine Room R/B
      G03196339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reinstall the EFI relay.
    5. Reinstall the EFI fuse.
      Fig 10: Removing EFI Fuse From Engine Room R/B
      G03196340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  9. CHECK HARNESS AND CONNECTOR (EFI RELAY - IGNITION SWITCH) 
    1. Remove the EFI relay from the engine room R/B.
    2. Disconnect the I10 ignition switch connector.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified conditions
      IG2 (I10-6) - EFI relay (2) Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified conditions
      IG2 (I10-6) or EFI relay (2) - Body ground 10 kΩ or higher
      Fig 11: Disconnecting I10 Ignition Switch Connector
      G03196341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reinstall the EFI relay.
    5. Reconnect the ignition switch connector.
      Fig 12: Removing EFI Relay From Engine Room R/B
      G03196342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  10. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - AM2 FUSE) 
    1. Disconnect the I10 ignition switch connector.
    2. Remove the AM2 fuse from the engine room R/B.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified conditions
      AM2 (I10-5) - AM2 fuse (2) Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified conditions
      AM2 (I10-5) - AM2 fuse (2) - Body ground 10 kΩ or higher
      Fig 13: Disconnecting I10 Ignition Switch Connector
      G03196343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ignition switch connector.
    5. Reinstall the AM2 fuse.
      Fig 14: Removing AM2 Fuse From Engine Room R/B
      G03196344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : CHECK AND REPAIR HARNESS AND CONNECTOR (AM2 FUSE - POSITIVE BATTERY TERMINAL, EFI FUSE - POSITIVE BATTERY TERMINAL) 
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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.

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