Question about 1995 Toyota Paseo
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following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
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4th gear disengagement:
The 4th gear is engaged automatically after the transmission has shifted through 1st, 2nd and 3rd gears
at certain speeds and loads. By pressing in the button at the rear of the selector level, the 4th gear can be
disengaged, thus providing a three-speed transmission. As a reminder the
? light on the dashboard
glows. By pressing in the button again, the transmission reverts to four-speed operation and the
light shuts off.
This is straight out of the owner's handbook. What this indicates is that there may be a problem with the shift solenoid. On the highway, does is seem to rev high? Can you press the button on the shifter and have the light go out? let me know.
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