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There is no dipstick. The engine and transmission was designed by Isuzu up till 2002, and the automatic transmission was a sealed, no-maint. transmission. You will either need to purchase the special tools needed, or...........that's right, go to a transmission shop!!!
Check trany fluid level , add if low.
To check level - engine on(running) , shift lever in park position . Locate transmission dipstick , check level , depending on temperature of fluid (roughly) , make sure it's within appropriate marks on dipstick.
If leak on trany is excessive , fix it or check level frequently.
Sorry to tell you this, but there is no dipstick. Honda says this in its maintenance materials:
Check automatic transmission fluid level only if leakage is suspected.
Automatic transmission has no dipstick, so fluid level can only be
measured by checking fluid temperature with a PGM Tester and removing
the overfill screw. Refer to the Service Manual for details.
I believe those transmissions are computer controlled. There should be a light that comes on when you need to put more fluid in. Only way to actually KNOW how much is in there is to change the tranny filter/pan gasket and see how much drains out
If you have an automatic transmission, you should take it to a mechanic or at least purchase the special fluid temperature gauge needed to do it right. You add fluid through the overfill screw opening found on the transmission fluid pan (there is no dipstick or underhood component on the 96' and later models). It should be located in one corner of the pan; there's also a drain plug is more toward the middle. Never open the overfill screw with the engine stopped - it should always be running and warm.
For a manual transmission, the fill plug is also on the pan, but it is located on the side.
There is not a dipstick for the automatic transmission on the 1999 Honda Passport. There are two plugs on the bottom of the transmission - the lowest one is the drain plug and the one located higher is the overfill plug. You should have a fluid temperature gauge as it is recommended that the temperature be between 90* F and 135* F when checking fluid level. (I believe you can order from dealer - I have also heard that running the engine for 10-15 min will put you near the proper temperature - to be certain, the temperature gauge is the right way to do it.) Run engine for a few minutes to reach optimum temperature. The vehicle must be on level ground and at idle to properly check fluid level. With proper temperature reached - and engine running at idle - set parking brake - remove the fill plug and add fluid with a syringe or small pump until it just starts to run out of the opening. Do not open the overfill screw with the engine stopped. Replace the fill plug and shift through gears - then remove and repeat one time to achieve proper level.