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 SYSTEMSSERVICE PRECAUTIONS
2011 Toyota Yaris L4-1.5L (1NZ-FE)
Transmission Control Systems: Service Precautions
2011 Toyota Yaris L4-1.5L (1NZ-FE)SECTION Service Precautions
U340E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION
NOTICE:
* Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM Programming and Relearning.
* Perform the REGISTRATION (VIN registration) when replacing the ECM Programming and Relearning.
HINT
The RESET MEMORY cannot be completed by only disconnecting the battery cable.
CAUTION:
When using compressed air, always aim away from yourself to prevent Automatic Transmission Fluid (ATF) or kerosene from spraying on your face.
NOTICE:
* The automatic transaxle is composed of high precision parts which need careful inspection before reassembly. Even a small nick could cause fluid leakage or affect the performance. The instructions here are organized so that you work on only one component group at a time. This will help avoid confusion caused by similar-looking parts of different sub-assemblies being on your workbench at the same time. The component groups are inspected and repaired from the converter housing side. As far as possible, complete the inspection, repair and reassembly before proceeding to the next component group. If a defect is found in a certain component group during reassembly, inspect and repair that group immediately. If a component group cannot be assembled because some parts are on order, be sure to keep all parts of the group in a separate container while proceeding with disassembly, inspection, repair and reassembly of other component groups.
* When changing the automatic transmission fluid, use of Toyota Genuine ATF WS is recommended.
* All disassembled parts should be washed clean and any fluid passages and holes should be blown through with compressed air.
* Dry all parts with compressed air. Never use a piece of cloth to dry them.
* Only recommended ATF or kerosene should be used for cleaning.
* After cleaning, the parts should be arranged in the correct order for efficient inspection, repair, and reassembly.
* New brake and clutch discs that are to be used for replacement must be soaked in ATF for at least 15 minutes before reassembly.
* All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with ATF prior to reassembly.
* All gaskets and rubber O-rings should be replaced with new ones.
* Do not apply adhesive cements to gaskets or similar parts.
* Make sure that the ends of snap rings are not aligned with any cutouts and are installed in the grooves correctly.
* When replacing a worn bushing, the sub-assembly containing the bushing must also be replaced.
* Check thrust bearings and races for wear and damage. Replace them as necessary.
* When working with seal packing material, you must observe the following:
* Using a razor blade and a gasket scraper, remove all the old packing (seal packing) material from the gasket surface.
* Clean both sealing surfaces with a non-residue solvent.
* Parts must be reassembled within 10 minutes of application. Otherwise, the packing (seal packing) material must be removed and reapplied.
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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.