ASE G1 Auto Maintenance and Light RepairAutomatic Transmission/TransaxleEasy
A technician is performing a routine fluid level check on an automatic transmission. The vehicle has been driven for at least 15 minutes and is currently idling in Park on a level surface. The technician notes the fluid level is significantly below the 'FULL' mark on the dipstick. What is the most appropriate next step?
- ADrain a small amount of fluid and re-check the level.
- BRe-check the fluid level with the engine running and the transmission in Neutral.
- CAdd transmission fluid immediately until the 'FULL' mark is reached.
- DAdvise the customer that a transmission flush is required due to low fluid.
Show answer & explanationAnswer & explanation
Correct answer: B. Re-check the fluid level with the engine running and the transmission in Neutral.
Many automatic transmissions require the fluid level to be checked with the engine running and the transmission in Neutral, not Park, to ensure proper circulation and an accurate reading. Checking in Park or with the engine off can give a misleadingly low reading.
Why the other options are wrong
- A. The fluid is already noted as low; draining it would worsen the condition.
- C. Adding fluid without verifying the correct checking procedure could lead to overfilling, which is detrimental.
- D. Low fluid does not automatically mean a flush is required; the immediate concern is the fluid level accuracy.
ATF Level Check Procedure
The correct procedure for checking automatic transmission fluid (ATF) level varies by vehicle but typically involves specific temperature, engine status, and gear selection.
- Always consult the vehicle's service manual.
- Most require engine running and at operating temperature.
- Some require Park, others Neutral.
Memory trick: Always Read The Manual, Engine Running, Neutral or Park.