2005 Scion xB 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 E3 and E6 ECM connectors.

      Standard: 

      ECM (+B VOLTAGE)

      Tester Connections Specified Conditions
      +B (E3-1) - E1 (E6-7) Between 9 V and 14 V
      Fig 1: Inspecting ECM (+B Voltage)
      G03095992Courtesy 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 E6 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      ECM - BODY GROUND (CHECK FOR OPEN)

      Tester Connections Specified Conditions
      E1 (E6-7) - Body ground Below 1 Ω
      Fig 2: Checking Harness And Connector (ECM - Body Ground)
      G03095993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ECM connector.
    5. Reconnect the negative battery cable.
    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.
      IGNITION OR STARTER SWITCH ASSY

      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
      Fig 3: Inspecting Ignition Or Starter Switch Assy
      G03095994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the ignition switch connector.
    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: Checking Fuse (EFI Fuse)
      G03095995Courtesy 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

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (When battery voltage applied to terminals 1 and 2)
      Fig 5: Inspect EFI Relay
      G03095996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the EFI relay.
    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 E3 ECM connector.
      3. Check the resistance.

        Standard (Check for open): 

        EFI RELAY - ECM, EFI RELAY - BODY GROUND (CHECK FOR OPEN)

        Tester Connections Specified Conditions
        EFI relay (3)-+B (E3-1) Below 1 Ω

        Standard (Check for short): 

        EFI RELAY - ECM, EFI RELAY - BODY GROUND (CHECK FOR SHORT)

        Tester Connections Specified Conditions
        EFI relay (3) or +B (E3-1) - Body ground 10 kΩ or higher
      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): 

        EFI RELAY - BODY GROUND (CHECK FOR OPEN)

        Tester Connections Specified Conditions
        EFI relay (1) - Body ground Below 1 Ω
        Fig 6: Checking Harness And Connector (EFI Relay - ECM, EFI Relay - Body Ground) (1 Of 2)
        G03095997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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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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