Slipping only in forward gears means the fluid level can be down here is how you check the fluid level much like a standard transmission. Suzuki swift zc71s uses cvt transmission oil and not ATF oil. Service the unit as well.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Fluid Types
Automatic Transaxle Fluid Type
Fluid type .................... Esso LT71141 or Total ATF H50235
Capacities
A/T Fluid Capacity (overhaul) .................... 7.3 ± 0.2 US qts (6.9 ± 0.2L)
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to make bigger)
Monday, December 2nd, 2013 AT 6:01 AM