2007 Scion tC Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK MIL 
    1. Check that MIL (Malfunction Indicator Lamp) lights up when turning the ignition switch to the ON position.

      Standard: 

      MIL lights up 

    NG: SYSTEM OK 

    NG: GO TO NEXT STEP 

  2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position and turn the intelligent tester on.
    3. Check the communication between the intelligent tester and ECM.

      Result 

      RESULT REFERENCE

      Condition Proceed to
      Communication Is possible A
      Communication Is not possible B

    A: GO TO  MIL CIRCUIT  

    B: GO TO NEXT STEP 

  3. INSPECT ECM (VC VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      ECM TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E8-18(VC) - E8-3(E1) Voltage is not 5 V
      Fig 1: Inspecting ECM (VC Voltage)
      G04869299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK MIL (THROTTLE POSITION SENSOR) 
    1. Disconnect the T1 throttle body connector.
    2. Turn the ignition switch to the ON position.
    3. Check the MIL.

      Result 

      MIL RESULT REFERENCE

      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE THROTTLE BODY 

    B: GO TO NEXT STEP 

  5. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the T1 throttle body connector.
    2. Turn the ignition switch to the ON position.
    3. Check the MIL

      Result 

      MIL RESULT REFERENCE

      Condition Proceed to
      MIL Illuminates A
      MIL does not illuminate B

    A: REPLACE CANISTER 

    B: GO TO NEXT STEP 

  6. CHECK WIRE HARNESS (ECM - BODY GROUND) 
    1. Disconnect the T1 throttle body connector.
    2. Disconnect the L1 canister pump module connector.
    3. Disconnect the E8 ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E8-18 (VC) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.