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HOMESERVICE MANUALSSCION2008XD AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (AUTOMATIC TRANSAXLE (DIAGNOSTIC CODES (P0791-U0100) & CIRCUIT TESTS))AUTOMATIC TRANSAXLE SYSTEMCIRCUIT TESTSTRANSMISSION CONTROL SWITCH CIRCUIT (FROM 12/2010)PROCEDURE
2008 Scion xD Automatic

Transmission Control Switch Circuit (FROM 12/2010): Procedure

2008 Scion xD AutomaticSECTION Procedure
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH) 
    1. Disconnect the transmission control switch connector of shift lever assembly.
      Fig 1: Identifying D24 Connector Terminals (With And Without Smart Key System)
      GTY307083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      3 - Body ground Ignition switch ON (IG) 11 to 14 V
      Ignition switch OFF Below 1 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying D24 Connector Terminals (With And Without Smart Key System)
      GTY308230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      7*1 - Body ground
      5*2 - Body ground      		 Always Below 1 Ω

      *1: w/ Smart Key System

      *2: w/o Smart Key System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT TRANSMISSION CONTROL SWITCH 
    1. Measure the resistance between each terminal of the shift lever assembly when the shift lever is moved to each position.
      Fig 3: Identifying Transmission Control Switch Connector Terminals
      GTY308217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Shift Position Specified Condition
      3 - 9*1
      3 - 7*2      		 S, "+" and "-" Below 1 Ω
      Except S, "+" and "-" 10 kΩ or higher
      2 - 7*1
      2 - 5*2      		 Press continuously
      "+"
      (Up shift)      		 Below 1 Ω
      S 10 kΩ or higher
      1 - 7*1
      1 - 5*2      		 Press continuously
      "-"
      (Down shift)      		 Below 1 Ω
      S 10 kΩ or higher

      *1: w/ Smart Key System

      *2: w/o Smart Key System

    NG → See step   5 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Connect the transmission control switch connector of the shift lever assembly.
      Fig 4: Identifying A55 Connector Terminals
      GTY299240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the ECM connector.
    3. Turn the ignition switch on (IG), and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

      Standard voltage

      Tester Connection Shift Position Specified Condition
      A55-25 (S) - Body ground S, "+" and "-" 11 to 14 V
      Except S, "+" and "-" Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the ECM connector.
    6. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard resistance

      Tester Connection Shift Position Specified Condition
      A55-16 (SFTU) - Body ground Press continuously
      "+"
      (Up shift)      		 Below 1 Ω
      S 10 kΩ or higher
      A55-51 (SFTD) - Body ground Press continuously
      "-"
      (Down shift)      		 Below 1 Ω
      S 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

  5. REPLACE TRANSMISSION CONTROL SWITCH. Refer to  REMOVAL 
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.