1988 PONTIAC FIERO Service Repair Manual

700.R4.46 AUTOMATIC TRANSMISSION
64 THROTTLE LINK
65 LEVER & BRACKET
ASSEMBLY, THROTTLE
91 BALL, CARBON STEEL - T.V. EXHAUST
(LOCATED IN VALVE BODY)
Figure 174 Throttle Lever and Bracket Assembly
h
LARGE END
INSTALLED 59
IN PISTON
I ILL.
NO. DESCRIPTION
52 PISTON, 3-4 ACCUMULATOR
53 RING, OIL SEAL
(3-4 ACCUMULATOR PISTON)
54 SPRING, 3-4 ACCUMULATOR
56 PLATE, VALVE BODY SPACER
59 SPRING,
1-2 ACCUMULATOR (CONICAL) 60 RING, OIL SEAL (1-2 ACCUM. PISTON) 61 PISTON, 1-2 ACCUMULATOR
62 COVER & PIN ASSEMBLY, 1-2 ACCUM. 63 BOLT, ACCUMULATOR COVER 77 PIN, ACCUMULATOR PISTON
88 GASKET, SPACER PLATE TO CASE
89 GASKET, SPACER PLATE TO VALVE BODY
JH0063-700R4
Figure 175 1-2 and 3-4 Accumulator Assembly
PBM, PCM,TNM,TUM,TXM
FAM,FJM, FMM,MAM, MOM, MFM, MKM, MLM,MRM,MXM, 1 RED I RED THM,TJM,TKM,TLM,YKM,YNM
Figure 176 1-2 and 3-4 Accumulator Spring Chart
- Remove pressure switches
Clean
o All valves, springs, bushings and control valve
body in clean solvent
o Dry using compressed air
o All Valves and Bushings For:
- Porosity
- Scoring
- Nicks
- Scratches
e Springs for Damaged or Distorted Coils
e Valve Body Casting For:
- Porosity
- Cracks
- Interconnected Oil Passages
- Damaged Machined Surfaces
Assemble (Figures 178, 179)
e Control valve assembly (67) exactly as shown.
Notice the
positiori of the valve lands and bushing
passages.
Install or Connect (Figures 180, 182)
1. Two checkballs (55) and one checkball (9 1) into
the valve body assembly and one checkball (55
B)
into the Auxiliary Valve Body as shown.
Checkball (91) is the larger copper colored ball
shown as
# 10 on Figure 180.
- retain with petrolatum.
2. Valve body assembly (67)
- connect the manual valve link (705) to the
inside detent lever (703).

AUTOMATIC TRANSMISSION 700-R4-47
Auxiliary Accumulator Valve Body Assembly
Clean (Figure 181)
e Auxiliary valve assembly (377) thoroughly in
clean solvent
- move the valves with a pick or small
screwdriver to dislodge any dirt or debris
that may have accumulated
e Air dry
+*+ Disassemble (Figure 181) m
1. (3) Bolts (373)
- Cover (371) is under spring pressure
2. Cover (371) and accumulator piston spring (370)
3. Piston (367)
4. Piston oil seal ring (53)
Disassemble (Figure 181)
e Position the auxiliary accumulator valve body on
a clean surface. Remove valve trains beginning
with the lower left hand corner. NOTE; valves
are under pressure-cover bores while removing
the roll pin.
e Valves and springs must be laid out on a clean
surface in the exact sequence as they are remvoed
Clean
a All valves and springs in clean solvent
e Air dry
Inspect
e Piston (367) for:
- cracks
- porosity
- damage
e Valves for:
- scoring
- nicks
- scratches
e Springs for damaged or distorted coils
a Auxiliary valve body (377) for:
- porosity
- damaged machined surfaces
e Orifice cup plug (359)
- remove only if damaged
Remove or Disconnect
Tools Required
#3 Screw Extractor
e Orifice cup plug (359). Use modified #3 screw
extractor.
Install or Connect
Tools Required
3/8" Rod
e Orifice cup plug (359). Use 3/8" rod.
- seat flush
Assemble (Figure 181)
e Auxiliary accumulator valve train exactly as
shown. Notice the valve lands
Assemble (Figure 181)
1. Piston oil seal ring (369) onto piston (367)
- lubricate with petrolatum
2. Piston (367)
3. Accumulator spring (370)
4. Cover
(371) and (3) bolts (373)
Install or Connect (Figures 181,184 and 185)
1. Check ball (55) into auxiliary accumulator valve
(377) - do not block orifice cup plug
- retain with petrolatum
2. Bolts (374-376) and auxiliary valve body (377)
- torque to 11 N-m (8 1bs.-ft.)
(DETENTILO) HAS BEEN
REMOVED ON 1988 MODELS.
ILL.
NO. DESCRIPTION
47A GOVERNOR FILTER LOCATION 478 CONVERTER CLUTCH FILTER LOCATION
55E #4 CHECK BALL (3-4 CLUTCHl3-2 EX.) 55F #8 CHECK BALL (2NDl1-2) 55G #I CHECK BALL (4TH ACCUMULATOR)
55H #3 CHECK BALL (PART THROTTLEIDRIVE 3) 106 RETAINER & BALL ASM. (DOUBLE ORIFICE)
Figure 177 Case Checkballs and Oil Screens - Location
Inspect (Figure 174) -
e The throttle lever and bracket assembly (65) for
- sticking, binding or damage
e Make sure it operates freely without restrictions
e Replace if necessary
Install or Connect (Figures 183,184 and 185)
1. T.V. link
(64) onto the T.V. lever and bracket as
shown

AUTOMATIC TRANSMISSION 700-R4-49
--
NO. DESCRIPTION I 301 VALVE, T.V. MODULATOR DOWNSHIFT
302 SPRING, T.V. MODULATOR DOWNSHIFT
VALVE
303 VALVE, T.V. MODULATOR UPSHIFT
304 SPRING, T.V. MODULATOR UPSHIFT VALVE
305 SLEEVE, CONVERTER CLUTCH THROTTLE
306 SPRING, CONVERTER CLUTCH THROTTLE
307 VALVE, CONVERTER CLUTCH THROTTLE
308 VALVE, CONVERTER CLUTCH SHlFT
309 SLEEVE, 3-4 THROTTLE VALVE
3 10 SPRING, 3-4 THROTTLE VALVE
31 1 VALVE, 3-4 THROTTLE
312 VALVE, 3-4 SHlFT
31 3 SLEEVE, 2-3 THROTTLE VALVE
314 SPRING, 2-3 THROTTLE VALVE
31
5 VALVE, 2-3 THROTTLE
31 6 VALVE, 2-3 SHlFT
31 7 SLEEVE, 1-2 THROTTLE VALVE
31
8 SPRING, 1-2 THROTTLE VALVE
31 9 VALVE, 1-2 THROTTLE
322 VALVE, 1-2 SHlFT
323 SLEEVE, THROTTLE VALVE PLUNGER
324 PLUNGER, THROTTLE VALVE
325 SPRING, THROTTLE VALVE
326 VALVE, THROTTLE
328 VALVE, 3-4 RELAY
329 VALVE, 4-3 SEQUENCE
330 SPRING, 4-3 SEQUENCE VALVE
331 SPRING, T.V.
LIMIT VALVE
332 VALVE, T.V.
LIMIT
333 VALVE, 1-2 ACCUMULATOR
334 SLEEVE, 1-2 ACCUMULATOR VALVE
335 SPRING, 1-2 ACCUMULATOR VALVE
336 VALVE,
LlNE BlAS
337 SPRING, LlNE BlAS VALVE
338 SPRING, 3-2 CONTROL
339 VALVE, 3-2 CONTROL
340 VALVE, MANUAL
341 PIN, COILED SPRING
342 PIN, COILED SPRING
343 RETAINER, SPRING (SLEEVE)
344 PLUG, VALVE BORE
345 PLUG, CUP
(-33 DIA.)
346 SWITCH ASM., PRESSURE (3RD CLUTCH)
347 SWITCH ASM., PRESSURE (4-3 PULSE)
348 SWITCH ASM., PRESSURE
(4TH CLUTCH)
349 SWITCH ASM., PRESSURE
(T.C.C.
SIGNAL)
350 BODY, CONTROL VALVE
351 PLUG, T.V. LIMIT
352 PLUG, VALVE BORE (12.5
- O.D.)
354 PLUG, CONVERTER CLUTCH SHlFT VALVE
BORE
(ECM CONTROLLED VEHICLES)
355 PLUG, CONVERTER CLUTCH T.V. BUSHING
BORE
(ECM CONTROLLED VEHICLES)
Figure 179 Control Valve Assembly-Legend
(COPPER FLASH) 9 1
55A
#2 CHECKBALL (3RD CLUTCH ACCUM.)
558 #12 CHECKBALL (FORWARD CLUTCH)
55C #6 CHECKBALL (DRIVE 3) 91 #10 CHECKBALL (T.V. EXHAUST)
359 CUP PLUG - ORIFICE
Figure 180 Valve Body Checkball Locations
2. T.V. lever and bracket assembly (65) onto the
valve body as shown
- attach with two valve body to case bolts
(69).
3. Wire harness
clips (66), filter retaining clip (87),
manual spring assembly (68), wire retaining
washer, and all remaining valve body to case bolts
(69) - Torque to 11.0 Nam (8 ft.lbs.).
4. "0"ring seal (34) onto the electrical connector
(33)
- lubricate with transmission fluid.
5. Electrical connector
(33) into the case
6.
"0" ring seal (49) on the solenoid assembly (50)
7. Solenoid assembly (50) into the case
- attach with two solenoid bolts (51)
- torque to 11 N . m (8 ft. lbs.)
- to correctly route and hook up the wires see
the wiring diagrams in the 700-R4 diagnosis
section.
The wire connectors are color coded to
correspond to the information in the wiring
diagram. On switches which take two
connectors, the terminals are reversible.
It
will be necessary to identify and use the
wiring diagram chart which corresponds to
the type
of vehicle you are working on. (See
the Diagnosis Section for the wiring
diagrams.)
Install or Connect (Figure 183, and 184)
1. Parking bracket (710)

700.R4-50 AUTOMATIC TRANSMISSION
366
363
55 #12 CHECKBALL
359 PLUG, CUP (ORIFICE)
360 VALVE, ABUSE
361 SPRING, ABUSE VALVE 73
362 STOP, ABUSE VALVE
363 PIN, SPRING
364 VALVE, LO OVERRUN CLUTCH
365 SPRING, LO OVERRUN CLUTCH VALVE (M6
X
1 X 24)
366 PIN, SPRING VALVE RETAINING
374 BOLT, SPEC. HEX WASHER HEAD
367 PISTON, ACCUMULATOR (M6 X 1 X
16) 369 RING, OIL SEAL ACCUMULATOR PISTON
375 BOLT, HEX HEAD (M6 X 1 X 40)
370 SPRING, ACCUMULATOR PISTON 376 BOLT, HEX HEAD (M6 X 1 X 45) 371 COVER, AUXILIARY ACCUMULATOR VALVE 377 AUXILIARY ACCUM. VALVE BODY ASM.
JH0154-700R4
Figure 18 1 Auxiliary Valve Body Assernbly
Figure 182 Manual Valve Link
64 LINK, THROTTLE LEVER TO CABLE
65 LEVER & BRACKET ASSEMBLY, THROTTLE
69 BOLTS, CONTROL VALVE
ASSEMBLY ~H0065-700R4
Figure 183 T.V. Lever and Bracket
- torque to 22 N.m (18 ft. lbs.)
2. The
1-2 accumulator piston seal (60) onto the 1-2
accumulator piston ((61)
3. The 1-2 accumulator piston (61) into the 1-2
accumulator cover and pin assembly (62)
- the three legs on the piston must face up
toward the case when installed.
4. The 1-2 accumulator spring (59) onto the piston
5. The 1-2 accumulator cover and pin assembly (62)
onto the case
- torque to 11 N*m (8 ft. lbs.)
Install or Connect (Figure 186)
1. filter seal (70)
onto the oil filter
- lubricate with transmission fluid.
2. Oil filter (71)
3. Oil pan gasket (72)
4. Chip magnet (93) into oil pan (73)
5. Oil pan (73) and bolts (74)
- torque to 16 N.m (12 ft. Ibs.)

A WASHER WlRE RETAINER
50 SOLENOID ASSEMBLY
51 BOLT, HEX WASHER HEAD (SOLENOID)
63 BOLT, ACCUMULATOR COVER
66 CLIP, ELECTRICAL WlRE
69 BOLT, VALVE BODY
75 BOLT, MANUAL DETENT SPRING
87 CLIP, FILTER RETAINER
92 CONDUIT, SOLENOID WlRE
374 BOLT, SPEC. HEX WASHER HEAD
(M6 X 1 X
18)
375 BOLT, HEX HEAD (M6 X 1 X 35)
376 BOLT, HEX HEAD (M6 X 1 X 45) JH0064-700-R4
Figure 184 Valve Body Bolt Locations
ILL. .
NO. DESCRIPTION
A WASHER, WlRE RETAINING
33 CONNECTOR, ELECTRICAL
96 TUBE, AUXILIARY ACCUMULATOR VALVE
97 CLAMP, TUBE
374 BOLT, SPECIAL HEX HEAD (M6 X
1 X 16)
375 BOLT, HEX HEAD (M6 X 1 X 35)
376 BOLT, HEX HEAD (M6 X 1 X 45)
377 AUXILIARY ACCUM. VALVE BODY ASM.
710 BRACKET, PARKING LOCK
71 5 BOLT, PARKING LOCK BRACKET
JH0067-700R4
AUTOMATIC TRANSMISSION 700-R4-51
10 CASE, TRANSMISSION
70 SEAL, FILTER
7
1 FILTER ASSEMBLY, TRANSMISSION OIL
72 GASKET, TRANSMISSION OIL PAN
73 PAN, TRANSMISSION OIL
74 SCREW, SPEC. HEX WASHER HEAD (PAN)
93 MAGNET, CHIP COLLECTOR
JH0155-700R4
Figure 186 Case, Pan and Filter Assembly
2-4 Servo Assembly
Measure (Figure 187)
TOOLS REQUIRED:
J-33037 Band Apply Pin Tool
1. Install
J-33037 as
shown with apply pin (29).
2.
Apply 11.0 N-m (100 in. Ibs.) torque.
3. If
white line "A" appears in the gage slot
"B", pin
length is correct.
4. Use pin selection chart to determine the correct
pin length.
Inspect
a Pistons for
- porosity or damage
- ring groove damage
Cover (15) for porosity or damage
Seals for
- nicks or cuts
- freeness in the seal groove
a Springs for distortion
e Pin for wear or burrs
Important
Check servo bore in the case for any wear which
may cut the servo seals.
~'~ure 185 Outside Electrical Connector

700-R4-52 AUTOMATIC TRANSMISSION
A. WHITE LINE B. GAGE SLOT
Figure 187 Servo Pin Length
Measure (Figure 188)
TOOLS REQUIRED:
Vernier Calipers
Scale
1. Measure Piston (25) Dimension
*A
2.
Measure housing (22) Dimension **B
3. Check Model Application
Assemble (Figures 189, 190, 191 and 192)
TOOLS REQUIRED:
5-22269-01
J-297 14
1. Cushion spring (26) into the 2nd apply piston
(25)
2. Cushion spring retainer (27) on the cushion
spring
3. Install J-22269-01.
- compress the retainer past the snap ring
groove in the 2nd apply piston.
- install the retainer ring (28).
4. The 2nd apply piston (25) onto the apply pin (29)
- retainer goes toward the shoulder of the pin.
5. Servo apply pin spring (20) on the pin
6. Servo apply pin washer (19) and retaining clip
(18)
7. Inner (23) and outer (24) seals on the 2nd apply
piston
- retain with petrolatum.
8. "0" ring seal (21) on servo piston housing
2ND APPLY PISTON & HOUSING APPLICATION
MODEL I DIMt!SION DIMENSION I **B I
I YAM, YOM, YMM I
MLM, MRM,MTM,MXM, PRM,TAM,TBM,
22 HOUSING, SERVO PISTON (INNER)
25 PISTON, 2ND APPLY
JH0156-700R4
Figure 188 2nd Apply Piston and Housing
Measurement
9. Servo piston inner housing (22) on the 2nd apply
piston
10. Seal ring (17) onto the 4th apply piston
11. The 4th apply piston (16) onto the apply pin
12. Return spring (31) on the pin
13. Servo piston assembly into the servo bore
14.
"0" ring seal (14) on the servo cover
- lubricate the seal with transmission fluid.
15. Servo cover (15) into the servo bore
16. Install J-297 14.
- compress the servo cover.
- install the retainer ring (13)
Governor Assembly
Inspect (Figure 193)
e Valve for free operation
e Weights for free operation
e Springs - missing or distorted
Sleeve for nicks, burrs, scored or galled
o Driven gear for damage

ILL.
NO. DESCRlPTlON
13 RING, SERVO COVER RETAINING
14 SEAL, "0" RlNG (2-4 SERVO COVER)
15 COVER, 2-4 SERVO
16 PISTON. 4TH APPLY
17 RING, 811- SEAL (4TH APPLY PISTON)
(OUTER)
18 RING, RETAINER (APPLY PIN) 19 WASHER, SEWVO APPLY PIN
20 SPRING, SERVO APPLY PIN
21 SEAL, "0" RlNG 22 HOUSING, SERVO PISTON (INNER)
23 RING, OIL SEAL (2ND APPLY PISTON)
(INNER)
24 RING, OIL SEAL (2ND APPLY PISTON)
(OUTER)
29 PIN, ~NB APPLY PISTON
31 SPRING, SERVO RETURN
JH0058-700R4
AUTOMATIC TRANSMISSION 700-R4-53
SECOND APPLY PISTON ASM.
Figure
190 2nd Servo Piston - Assembly
Disassemble
DO NOT DISASSEMBLE EXCEPT, FOR
CLEANING
OR PART REPLACEMENT.
1. Cut off one end of each governor weight pin.
2. Pins (84)
3. Weights
4. Valve
5. Driven gear (83)
- Drive out the retainer pin (82) with a small
punch.
- Support the governor assembly sleeve on
plates installed in the exhaust slots. Push
out the gear with an arbor press and a long
punch.
e Wash all parts in solvent.
Air dry and blow out passages.
Assemble
1. Install a new governor drive gear.
- support the governor or plates through the
exhaust slots.
- press gear (83) into the sleeve until seated.
- drill a new retaining pin hole in the sleeve
ninety degrees from the existing hole. Use a
3.0
mm (1/8 in.) drill.
- Install retainer pin (82) and stake.
2. Valve into the sleeve
3. Weights, springs, and thrust cap onto the
governor assembly
4. Retaining
pins (84) into the thrust cap (85) and
governor assembly
5. Stake the retaining pins (84).
6. Check for free operation of the valve and weights.
Figure 189 2-4 Servo Assembly