2004 Scion xA AutomaticFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    Fig 1: Inspecting ECM (+B Voltage)
    G03367212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Measure the voltage between the specified terminals of the E4 and E6 ECM connectors.

      Standard: 

      STANDARD

      Tester Connection Specified Condition
      +B (E6-1) - E1 (E4-7) 9 to 14 V
    1. OK : REPLACE ECM (See  REPLACEMENT  ) 
    2. NG : Go to next step. 
  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    Fig 2: Checking Harness & Connector (ECM - Body Ground)
    G03367213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E4 ECM connector.
    2. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Tester Connection Specified Condition
      E1 (E4-7) - Body ground Below 1 Ω
    3. Reconnect the ECM connector.
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : Go to next step. 
  3. INSPECT IGNITION OR STARTER SWITCH ASSY 
    Fig 3: Inspecting Ignition Or Starter Switch Assy
    G03367214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the I10 ignition switch connector.
    2. Measure the resistance between the connector terminals shown in the chart below.
      INSPECT

      Switch Position Tester Connection Specified Condition
      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.
    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 No.1.
    2. Check for continuity in the EFI fuse.
      Fig 4: Checking Fuse (EFI Fuse)
      G03367215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: Continuity 

    3. Reinstall the EFI fuse.
    1. NG : CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE 
    2. OK : Go to next step. 
  5. INSPECT EFI RELAY 
    1. Remove the EFI relay from the engine room R/B.
    2. Inspect the EFI relay.
      Fig 5: Inspecting EFI Relay
      G03367216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      INSPECT EFI RELAY

      Tester Connection Specified Condition
      1 - 2 Continuity
      3 - 5 No Continuity
      Continuity (Apply Battery Voltage To Terminals 1 & 2)
    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 connector.
      Fig 6: Checking Harness (Efi Relay - ECM, Efi Relay - Body Ground)
      G03367217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the EFI relay from the engine room R/B.
      2. Disconnect the E6 ECM connector.
      3. Measure the resistance between the wire harness side connectors.

        Standard (Check for open): 

        STANDARD (CHECK FOR OPEN)

        Tester Connection Specified Condition
        EFI relay (3) - +B (E6-1) Below 1 Ω

        Standard (Check for short): 

        STANDARD (CHECK FOR SHORT)

        Tester Connection Specified Condition
        EFI relay (3) Or +B (E6-1) - 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.
      Fig 7: Checking Harness (EFI Relay - ECM, EFI Relay - Body Ground)
      G03367218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the EFI relay from the engine room R/B.
      2. Check for continuity between the wire harness side connector and body ground.

        Standard (Check for open): 

        STANDARD (CHECK FOR OPEN)

        Tester Connection Specified Condition
        EFI relay (1) - Body Ground Below 1 Ω
      3. Reinstall the EFI relay.
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : Go to next step. 
  7. CHECK FUSE (AM2 FUSE) 
    Fig 8: Checking Fuse (AM2 Fuse)
    G03367219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the AM2 fuse from the engine room R/B.
    2. Check for continuity in the AM2 fuse.

      Standard: Continuity 

    3. Reinstall the AM2 fuse.
    1. NG : CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE 
    2. OK : Go to next step. 
  8. CHECK HARNESS AND CONNECTOR (EFI RELAY - EFI FUSE) 
    Fig 9: Checking Harness (EFI Relay - EFI Fuse)
    G03367220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the EFI relay from the engine room R/B.
    2. Remove the EFI fuse from the engine room R/B.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Tester Connection Specified Condition
      EFI Relay (5) - EFI fuse (2) Below 1 Ω

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Tester Connection Specified Condition
      EFI relay (5) - EFI fuse (2) - Body Ground 10 kΩ Or Higher
    4. Reinstall the EFI relay.
    5. Reinstall the EFI fuse.
      Fig 10: Checking Connector (EfI Relay - EFI Fuse)
      G03367221Courtesy 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) 
    Fig 11: Checking Harness (EFI Relay - Ignition Switch)
    G03367222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the EFI relay from the engine room R/B.
    2. Disconnect the I10 ignition switch connector.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Symbols (Terminal No.) Specified condition
      IG2 (I10-6) - EFI Relay (2) Below 1 Ω

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Symbols (Terminal No.) Specified condition
      IG2 (I10-6) Or EFI Relay (2) - Body Ground 10 kΩ Or Higher
    4. Reinstall the EFI relay.
    5. Reconnect the ignition switch connector.
      Fig 12: Checking Harness (EFI Relay - Ignition Switch)
      G03367223Courtesy 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) 
    Fig 13: Checking Harness (Ignition Switch - Am2 Fuse)
    G03367224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the I10 ignition switch connector.
    2. Remove the AM2 fuse from the engine room R/B.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Symbols (Terminal No.) Specified Condition
      AM2 (I10-5) - AM2 Fuse (2) Below 1 Ω

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Symbols (Terminal No.) Specified condition
      AM2 (I10-5) - AM2 Fuse (2) - Body Ground 10 kΩ Or Higher
    4. Reconnect the ignition switch connector.
    5. Reinstall the AM2 fuse.
      Fig 14: Checking Connector (Ignition Switch - Am2 Fuse)
      G03367225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : CHECK AND REPAIR HARNESS AND CONNECTOR (AM2 FUSE - BATTERY POSITIVE TERMINAL, EFI FUSE - BATTERY POSITIVE 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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