Automatic Transmission & Transaxle
Work Example 5

WorkKey Level: 4
NATEF Automotive Tasks: II.A.5, II.A.8

Manufacturer’s specs state that pressure readings in drive should be within 10% of pressure readings in neutral. Is the drive reading as indicated below, within spec? What are the possible explanations for this? What would be a possible customer complaint?

	Neutral (Park)		Drive

   

 

 

 

 

                                                              

Solution:

No, the drive reading is not within specs. An acceptable spec range is + 10% of park.
(park)(10%) = (appx. 180)(0.10) = 18 psi.
162 psi < reading < 198 psi

Possible explanations may vary.Some examples are:
No drive engagement and No reverse engagement.

Possible customer complaints may vary.Some examples are:
Soft shift, Slipping, and No Engagement.