This vehicle doesn't have a traditional transmission dip stick for checking fluid level and condition. Instead, with the engine warm, running, and in park, there is a fill plug that is removed. Once removed the fluid should trickle out. If it doesn't, then you add until it does.
Here are the directions from my manual. The attached pics correlate with the directions.
1999 Isuzu Truck Rodeo LS 2WD V6-3.2L
Component Tests and General Diagnostics
Vehicle Maintenance Fluids Fluid - A/T Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
CHECKING TRANSMISSION FLUID LEVEL AND CONDITION
Checking fluid level and condition (color and odor) at regular intervals will provide early diagnosis information about the transmission. This information may be used to correct a condition that, if not detected early, could result in major transmission repairs.
IMPORTANT: When new, automatic transmission fluid is red in color. As the vehicle is driven, the transmission fluid will begin to look darker in color. The color may eventually appear light brown. A dark brown color with burnt odor may indicate excessive fluid deterioration and signal a need for fluid change.
When adding or changing fluid, use only DEXRON III.
CAUTION: DO NOT OVERFILL. Overfilling will cause foaming, loss of fluid, abnormal shifting and possible damage to the transmission.
1. Park the vehicle on level ground and apply the parking brake firmly.
2. Check fluid level with engine running at idle.
NOTE: Be sure that transmission fluid temperature is below 30 C (86 F).
3. Move the selector lever through all gear ranges.
4. Move the selector lever to "Park".
5. Let engine idle for 3 minutes and open the overfill screw (1).
6. Add released transmission fluid until it flows out over the overfill screw opening.
7. Let engine idle until a fluid temperature between 32 C (90 F) and 57 C (135 F) is reached, then close the overfill screw (1).
Torque: 38 Nm (28 ft. Lbs.)
NOTE: Check transmission fluid temperature with scan tool.
Minimum fluid level 57 C (135 F)
Maximum fluid level 32 C (90 F)
CAUTION: Do not open overfill screw with engine stopped.
CAUTION: DO NOT CHECK FLUID LEVEL UNDER THESE CONDITIONS:
- Immediately after driving at sustained highway speeds.
- In heavy city traffic during hot weather.
- If vehicle is towing a trailer.
If the vehicle has been operated under these conditions, shut the engine off and allow the vehicle to "cool" for thirty (30) minutes. After the cool-down period, restart the vehicle and continue from step 2 above.
- Fluid should be changed according to the maintenance schedule.
I hope this helps. Let me know if you have other questions or need help.
Images (Click to enlarge)
Monday, April 5th, 2021 AT 1:59 PM