SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSCION2008XD AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (AUTOMATIC TRANSAXLE (DIAGNOSTIC CODES (P0791-U0100) & CIRCUIT TESTS))AUTOMATIC TRANSAXLE SYSTEMCIRCUIT TESTSTCM POWER SOURCE CIRCUITPROCEDURE
2008 Scion xD Automatic

TCM Power Source Circuit: 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. INSPECT TCM TERMINAL VOLTAGE (+B TERMINAL) 
    1. Disconnect the TCM connector.
      Fig 1: Identifying TCM (+B) Connector Terminals
      GTY176062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      B53-18 (+B) - B53-8 (E1) Ignition Switch on (IG) 9 to 14 V

      Result

      Result Proceed to
      NG A
      OK B

    B → CHECK FOR INTERMITTENT PROBLEMS 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: TCM Connector Terminal Identification
      GTY176583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      B53-8 (E1) - Body ground Always Below 1 Ω
    2. Reconnect the TCM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - EFI RELAY) 

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

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

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote 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.