Pontiac Fiero 1988 Service Manual page 718

AUTOMATIC
TRANSAXLE 7
A-1
S E C T I O N 7
AUTOMATIC TRANSAXLE
C O N T E N T S
GENERAL INFORMATION AUTOMATIC TRANSAXLES 7A
ON VEHICLE SERVICE .... 7A1
125C UNIT REPAIR 125C
S E C T I O N 7 A
TRANSAXLE GENERAL INFORMATION
C O N T E N T S
TRANSAXLE IDENTIFICATION NOISE AND VIBRATION
INFORMATION 7A-1 ANALYSIS 7A-3
TRANSAXLE DEFINITIONS TRANSAXLE FLUID LEVEL
Throttle Positions 7 A-1 INFORMATION 7A^3
Shift Conditions 7A-I TRANSAXLE FLUID LEVEL
Noise Conditions 7A-3 CHECKING
PRELIMINARY CHECKING PROCEDURE 7A-4
PROCEDURE 7A-3
The information contained in this section is common to all automatic transaxles. For on-vehicle service
procedures refer to Section 7A1. For complete Diagnosis and Unit Repair refer to the specific transaxle sections.
For vehicles sold in Canada also refer to the appropriate Canadian Service Manual Supplement for
driveability diagnosis.
TRANSAXLE IDENTIFICATION INFORMATION
All automatic transaxles have a metal
identification nameplate attached to the case exterior.
The location of this name plate is shown in Figure 1.
The information on the nameplate will assist in the
servicing and determination of replacement parts when
ordered through a GM Parts Catalog.
Additional Transaxle identification is provided on
the Service Parts Identification label. This label contains
information on the regular production options (RPO) as
well as standard and mandatory options. This label is
affixed to the inside of each vehicle at the assembly plant.
Refer to Section OA of this Service Manual for label
location and information.
TRANSAXLE DEFINITIONS
The following definitions are being provided to
establish a common language and assist the user in
describing transaxle related conditions. Some of these
terms or conditions are used in the transaxle sections
of this Service Manual.
Throttle Positions
m
M i n i m u m
Throttle - the least amount of
throttle opening required for an upshift.
• L i g h t T h r o t t l e
- approximately 1/4 of
accelerator pedal travel.
a M e d i u m T h r o t t l e
- approximately 1/2 of
accelerator pedal travel.
• H e a v y T h r o t t l e
- approximately 3/4 of the
accelerator pedal travel.
• W i d e O p e n T h r o t t l e ( W O T )
- full travel of
the accelerator pedal.
m
F u l l T h r o t t l e D e t e n t D o w n s h i f t
- a quick
apply of the accelerator pedal to its full travel,
forcing a downshift,
o
Z e r o T h r o t t l e C o a s t d o w n
- a full release of
the accelerator pedal while the vehicle is in
motion and in drive range.
• E n g i n e B r a k i n g
- a condition where the engine
is used to slow the vehicle by manually
downshifting during a zero throttle coastdown.
Shift Conditions
m
B u m p
- a sudden and forceful apply of a clutch
or band.
• C h u g g l e
- a bucking or jerking condition that
may be engine related. May be most noticeable
when the converter clutch is engaged. Similar to
the feel of towing a trailer.
• D e l a y e d
- a condition where a shift is expected
but does not occur for a period of time. Samples
of this condition could be described as clutch or
band engagement does not occur as quickly as