Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2011YARIS L4-1.5L (1NZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATION
2011 Toyota Yaris L4-1.5L (1NZ-FE)
Transmission Control Systems: Description and Operation
2011 Toyota Yaris L4-1.5L (1NZ-FE)SECTION Description and Operation
U340E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: SYSTEM DIAGRAM
The configuration of the electronic control system in the U340E automatic transaxle is as shown in the following chart.
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
(a) The ECT (Electronic Controlled automatic Transmission/Transaxle) is an automatic transmission/transaxle that electronically controls shift timing using the ECM. The ECM detects electrical signals that indicate engine and driving conditions, and controls the shift point, based on driver habits and road conditions. As a result, fuel efficiency and power transmission/transaxle performance are improved.
Shift shock has been reduced by controlling the engine and transmission simultaneously.
In addition, the ECT has features such as the following:
Diagnostic function
Fail-safe function when a malfunction occurs
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.