Toyota Previa 1991-1997 Repair Information

Automatic Transmission Repair Guide

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FLUID RECOMMENDATIONS



All Toyota Previa automatic transmissions use ATF Dexron® II or Dexron® III fluid.

LEVEL CHECK



See Figures 1, 2 and 3

Check the automatic transmission fluid level at least every 15,000 miles (24,000 km). The dipstick is located in the under engine access hole cover compartment. The fluid level should be checked only when the transmission is hot (normal operating temperature). The transmission is considered hot after about 20 miles of highway driving.

  1. Park the van on a level surface with the engine idling. Shift the transmission into P and set the parking brake.
  2.  
  3. Remove the dipstick, wipe it clean and reinsert if firmly. Be sure that it has been pushed all the way in. Remove the dipstick and check the fluid level while holding it horizontally. All models have a HOT and a COLD side to the dipstick.
  4.  



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Fig. Fig. 1: Push back the lever on the automatic transmission dipstick



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Fig. Fig. 2: While the engine is idling, pull out the dipstick and check the fluid level



COLD -The fluid level should fall in this range when the engine has been running for only a short time.
 
HOT -The fluid level should fall in this range when the engine has reached normal running temperatures.
 



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Fig. Fig. 3: Level indicators are marked on the dipstick for the transmission

  1. If the fluid level is not within the proper area on either side of the dipstick, pour ATF into the dipstick tube. This is easily done with the aid of a funnel. Check the level often as you are filling the transmission. Be extremely careful not to overfill it. Overfilling will cause slippage, seal damage and overheating. Approximately one pint of ATF will raise the level from one notch to the other.
  2.  

Always use the proper transmission fluid when filling your car's transmission. All Previa models use Dexron® II or Dexron® III. Always check with the owner's manual to be sure. NEVER use Type F or Type T in a transmission requiring Dexron® II/Dexron® III or vice versa, as severe damage will result.


CAUTION
The fluid on the dipstick should always be a bright red color. It if is discolored (brown or black), or smells burnt, serious transmission troubles, probably due to overheating, should be suspected. The transmission should be inspected by a qualified service technician to locate the cause of the burnt fluid.

DRAIN & REFILL



See Figures 4 through 8

The automatic transmission fluid should be changed at least every 25,000-30,000 miles (40,000-48,000 km). If the van is normally used in severe service, such as stop-and-go driving, trailer towing or the like, the interval should be halved. The fluid should be hot before it is drained; a 20 minute drive will accomplish this.



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Fig. Fig. 4: The automatic transmission drain plug is located at the bottom of the pan

  1. Remove the dipstick from the filler tube and install a funnel in the opening.
  2.  
  3. Position a suitable drain pan under the drain plug. Loosen the drain plug and allow the fluid to drain.
  4.  



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Fig. Fig. 5: Loosen and remove the drain plug on the automatic transmission



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Fig. Fig. 6: Some fluid may drip onto your hand as you remove the plug



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Fig. Fig. 7: Allow all the fluid to flow from the pan into a suitable container

  1. Install and tighten the drain plug to 15 ft. lbs. (20 Nm).
  2.  



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Fig. Fig. 8: Before installing, inspect the plug and gasket for damaged threads and deterioration

  1. Through the filler tube opening, add the proper amount of transmission fluid as specified in the Capacities Chart.
  2.  
  3. Start the engine and shift the selector into all positions from P through L, the shift into P.
  4.  
  5. Check the fluid level and add as required.
  6.  


WARNING
Do not overfill the transmission.

PAN & FILTER SERVICE



See Figures 9 through 23

  1. To avoid contamination of the transmission, thoroughly clean the exterior of the oil pan and surrounding area to remove any deposits of dirt and grease.
  2.  
  3. Position a suitable drain pan under the oil pan and remove the drain plug. Allow the oil to drain from the pan. Set the drain plug aside.
  4.  


CAUTION
Check the fluid in the drain pan, it should always be a bright red color. It if is discolored (brown or black), or smells burnt, serious transmission troubles, probably due to overheating, should be suspected. The transmission should be inspected by a qualified service technician to locate the cause of the burnt fluid.

  1. Loosen and remove all but two of the oil pan retaining bolts. Try to remove them in a crisscross pattern.
  2.  



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Fig. Fig. 9: Remove the transmission pan retaining bolts in a crisscross pattern



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Fig. Fig. 10: Remove all of these bolts when lowering the automatic drain pan

  1. Support the pan by hand and slowly remove the remaining two bolts.
  2.  
  3. Carefully lower the pan to the ground. There will be some fluid still inside the pan, so be careful.
  4.  



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Fig. Fig. 11: Always use two hands to lower the pan

  1. On the A46DE and A46DF, oil tubes cover the strainer area. Pry up both oil tube ends with a large tool and remove the four oil tubes. Disconnect the wiring from the No. 1 and No. 2 and the No. 3 solenoids.
  2.  



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Fig. Fig. 12: On some models, the transmission tubes will need to be removed

  1. Remove the oil strainer attaching bolts and carefully remove the strainer. The strainer will also contain some fluid.
  2.  



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Fig. Fig. 13: Disengage the wiring for the solenoids if present



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Fig. Fig. 14: Remove the oil strainer retaining bolts ...



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Fig. Fig. 15: ... then lower the strainer

Some of the oil strainer bolts may be slightly longer than the others. Make a mental note of where the longer bolts go so that it may be reinstalled in the original position.

  1. Remove the oil strainer and discard the old gaskets.
  2.  



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Fig. Fig. 16: Scrape any old gasket material from around the mating area

  1. Drain the remainder of the fluid from the oil pan and wipe the pan clean with a rag. With a gasket scraper, remove any old gasket material from the flanges of the pan and the transmission. All van automatic transmissions use FIPG (08826-00090), Three bond 1281 or equivalent.
  2.  

Depending on the year and maintenance schedule of the vehicle, there may be from one to three small magnets on the bottom of the pan. These magnets were installed by the manufacturer at the time the transmission was assembled. The magnets function to collect metal chips and filings from clutch plates, bushings and bearings that accumulate during the normal break-in process that a new transmission experiences. So, don't be alarmed if such accumulations are present. Clean the magnets and reinstall them. They are useful tools for determining transmission component wear.



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Fig. Fig. 17: Clean and inspect the magnets in the bottom of the transmission pan



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Fig. Fig. 18: Clean all the mating areas around the transmission



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Fig. Fig. 19: Clean the gasket material from the pan



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Fig. Fig. 20: A rag can be used to thoroughly clean the inside of the pan

To install:
  1. Install the new oil strainer with new gaskets. Tighten the retaining bolts in their proper locations.
  2.  
  3. Tighten the oil strainer bolts to the following:

    A46DE and A46DF-48 inch lbs. (5 Nm)
     
    A340E and A340F-7 ft. lbs. (10 Nm)
     

  4.  
  5. When installing the bolts on the A340F, insert as specified:

    A-0.63 inch (16mm)
     
    B-0.79 inch (20mm)
     
    C-1.10 inch (28mm)
     

  6.  



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Fig. Fig. 21: The A340E oil strainer is retained with 3 bolts



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Fig. Fig. 22: A340F automatic transmission bolt locations

  1. Install any components such as the oil tubes.
  2.  



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Fig. Fig. 23: Install the oil tubes on models equipped

  1. Install the new sealant onto the oil pan. Position the magnets so that they will not interfere with the oil tubes.
  2.  
  3. Raise the pan and gasket into position on the transmission and install the retaining bolts. Tighten the retaining bolts in a crisscross pattern to:

    A340E and A340F-65 inch lbs. (7 Nm)
     
    A46DE and A46DF-39 inch lbs. (4 Nm)
     

  4.  

  1. Install and tighten the drain plug to 15 ft. lbs. (20 Nm).
  2.  
  3. Fluid is added only through the dipstick tube. Use only the proper automatic transmission fluid; do not overfill.
  4.  
  5. Replace the dipstick after filling. Start the engine and allow it to idle. DO NOT race the engine!
  6.  
  7. After the engine has idled for a few minutes, shift the transmission slowly through the gears and then return it to P . With the engine still idling, check the fluid level on the dipstick. If necessary, add more fluid to raise the level to where it is supposed to be.
  8.  

 
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