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HOMESERVICE MANUALSSCION2007TC BASE, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSAXLEAUTOMATIC TRANSAXLE SYSTEMFAIL-SAFE CHART
2007 Scion tC Base, Automatic

Fail-Safe Chart

2007 Scion tC Base, AutomaticSECTION Fail-Safe Chart
  1. FAIL-SAFE 

    This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.

    1. ATF (Automatic Transmission Fluid) temperature sensor:

      When the ATF temperature sensor has a malfunction, O/D upshift is prohibited.

    2. Counter gear speed sensor NC (Speed sensor NC): When the counter gear speed sensor has a malfunction, O/D upshift is prohibited.
    3. Shift solenoid valve DSL:

      When the solenoid valve DSL has a malfunction, the current to the solenoid valve is stopped. This stops lock-up control, then fuel economy decreases.

    4. Shift solenoid valve SL1, SL2 and S4:

      Fail safe function:

      If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid "ON" and "OFF" in order to shift into the gear positions shown in the table below.

      Manual shifting as shown in the following table must be done (In case of a short circuit, the ECM stops sending the current to the short circuited solenoid). Even if starting the engine in the fail-safe mode, the gear position remains in the same position.

      HINT:

      • *1: Actual gear shift (gear position) under failsafe operation.
      • OFF: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
      • →: Condition in the electrical malfunction is shown on the left of "→".

        Condition in the fail-safe mode is shown on the right of "→".

      FAIL-SAFE MODE CHART

      Normal Solenoid Valve SL1 ON OFF OFF OFF
      SL2 ON ON OFF OFF
      S4 OFF OFF OFF ON
      Gear Position 1st 2nd 3rd 4th (O/D)
      SL1 Malfunction Solenoid Valve SL1 OFF
      SL2 ON ON OFF → ON OFF → ON
      S4 OFF OFF OFF → ON ON
      Gear Position *1 2nd 2nd 3rd 3rd
      SL2 Malfunction Solenoid Valve SL1 ON → OFF OFF OFF OFF
      SL2 OFF
      S4 OFF OFF OFF ON
      Gear Position *1 3rd 3rd 3rd 4th (O/D)
      S4 Malfunction Solenoid Valve SL1 ON OFF OFF OFF
      SL2 ON ON OFF OFF
      SL4 OFF
      Gear Position *1 1st 2nd 3rd 3rd
      SL1 and SL2 Malfunction Solenoid Valve SL1 OFF
      SL2 OFF
      S4 OFF OFF OFF ON
      Gear Position *1 3rd 3rd 3rd 4th (O/D)
      SL1 and S4 Malfunction Solenoid Valve SL1 OFF
      SL2 ON ON OFF → ON OFF → ON
      S4 OFF
      Gear Position *1 2nd 2nd 2nd 2nd
      SL2 and S4 Malfunction Solenoid Valve SL1 ON → OFF OFF OFF OFF
      SL2 OFF
      S4 OFF
      Gear Position *1 3rd 3rd 3rd 3rd
      SL1, SL2 and S4 Malfunction Solenoid Valve SL1 OFF
      SL2 OFF
      S4 OFF
      Gear Position *1 3rd 3rd 3rd 3rd
RENDER: 1.0x

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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.