Pontiac Fiero 1988 Service Manual page 772

HYDRAULIC DIAGNOSIS 125C-31
MANUAL SECOND
INTERMEDIATE B A N D - APPLIED F O R W A R D CLUTCH - APPLIED
A 3-2 downshift can be accomplished by moving the selector lever from Drive (D) range to manual
Second.
When the selector lever is in manual Second position, RND oil will exhaust at the manual valve. In-
termediate oil from the manual valve is directed between the reverse and T.V. boost valves.
Intermediate oil acting on the reverse boost valve plus the pressure regulator spring force will boost
line pressure to 827 kPa (120 psi) which is required to hold the intermediate band and forward clutch on.
Because RND oil is exhausted, the transmission will shift to 2nd gear, regardless of vehicle speed.
(RND oil is the feed for direct clutch oil in 3rd gear.) With the transmission in 2nd gear, manual
Second, it cannot upshift to 3rd gear regardless of vehicle speed.
SUMMARY
The forward clutch and intermediate band are applied. The transmission is in manual Second gear.
JH0026125C
Figure 28 Manual Second