1988 PONTIAC FIERO Service Repair Manual

70044-52 HYDRAULIC DIAGNOSIS
r3RD CLUTCH SW
POS. SOL.' TERMINAL NEG. SOL. TERMINAL
TO TERMINAL A TO TERM. D (COLOR ID-RED) (ECM GROUND)
(COLOR ID-BLACK) T.C.C.
SOL
(N.O. OIL PATH)
NORMALLY OPEN
(N.O.) NORMALLY CLOSED (N.C.)
988 MODEL: YPM
JH0174-700R4-R 1
Figure 55 Wiring Diagram - Type 16

HYDRAULIC DIAGNOSIS 700-R4-53
1 LINE 16 T.V.F.
2 D4
17 OVERRUN CLUTCH
3 D2
18 T.V. EX.
4 LO 19
D3IPART THROTTLE
5 REVERSE
20 PART THROTTLE
6 GOVERNOR
21 D3
7 LO
- 1ST FEED 22 4TH CLUTCH
I 8 LOIREVERSE 23 C.C. SIG.
9 3RD ACCUMULATOR 24 MOD. UP
10 T.V.
25 MOD. DOWN
11 M.T.V.
26 DETENT
12 ACCUMULATOR 27 3-4 CLUTCH
13 4TH SIGNAL 28
DETENTILO
14 2ND CLUTCH 29 RND4-3
15 3-4 ACCUMULATOR
30 3RD CLUTCH 3 1
IDENTIFICATION
32
VOID
33 EXHAUST
34 SF
35 4-3
42 D4 ABUSE
43 3RD FEED
44 3-2
HIGH SPEED
45 2ND FEED
46 3RD CL. EXHAUST
47 4TH FEED
48 1-2 ACCUMULATOR
I JH0042-700R4 I Figure 56 Valve Body Oil Passages

700.R4.54 HYDRAULIC DIAGNOSIS
NON ECM 1
CONTROLLED I I VEHICLES I ONLY I
307 306 309 L - - - - - - - - - - - - -
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
VALV1. 305 SLEEVE, CONVERTER CLUTCH THROTTLE
306 SPRING, CONVERTER CLUTCH THROTTLE
307 VALVE, CONVERTER CLUTCH THROTTLE
308 VALVE, CONVERTER CLUTCH SHIFT
309 SLEEVE, 3-4 THROTTLE VALVE
310 SPRING, 3-4 THROTTLE VALVE
31 1 VALVE, 3-4 THROTTLE
3
1 2 VALVE, 3-4 SHIFT
313 SLEEVE, 2-3 THROTTLE VALVE
314 SPRING, 2-3 THROTTLE VALVE
3 15 VALVE, 2-3 THROTTLE
31 6 VALVE, 2-3 SHIFT
31
7 SLEEVE, 1-2 THROTTLE VALVE
31 8
SPRING, 1-2 THROTTLE VALVE
3 1 9 VALVE, 1-2 THROTTLE
322 VALVE, 1-2 SHIFT
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.
LlMlT VALVE
332 VALVE, T.V. LlMlT
333 VALVE, 1-2 ACCUMULATOR
334 SLEEVE, 1-2 ACCUMULATOR VALVE
335 SPRING, 1-2 ACCUMULATOR VALVE
336 VALVE,
LlNE BIAS
337 SPRING, LlNE BIAS \IALVE
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
350 BODY, CONTROL VALVE 351 PLUG, T.V. LlMlT
352 PLUG, VALVE BORE (12.5 - O.D.) 354 PLUG, CONVERTER CLUTCH SHIFT VALVE
BORE (ECM CONTROLLED VEHICLES)
355 PLUG, CONVERTER CLUTCH T.V. BUSHING
BORE (ECM CONTROLLED VEHICLES)
JH0043-700R4
Figure 57 Valve Trains

HYDRAULIC DIAGNOSIS 700.R4.55
ILL.
NO. DESCRIPTION
1 LINE
2 D4
3
02 4 LO
5 REVERSE
6 GOVERNOR
7 LO
- lST FEED
8
LOIREVERSE
9 3RD ACCUMULATOR
10 T.V.
11 M.T.V.
12 ACCUMULATOR
13 4TH SIGNAL
ILL.
NO. DESCRIPTION
14 2ND CLUTCH
15 3-4 ACCUMULATOR
16 T.V.F.
17 OVERRUN CLUTCH
18 T.V. EX.
19
D31PART THROTTLE
20 PART THROTTLE
21 D3
22 4TH CLUTCH
23 C.C. SIG.
24 MOD. UP
25 MOD. DOWN
26 DETENT
ILL.
NO. DESCRIPTION
27 3-4 CLUTCH
28 DETENTILO
29 RND4-3
30 3RD CLUTCH
31 IDENTIFICATION
42 D4 ABUSE
43 3RD FEED
44 3-2
HIGH SPEED
45 2ND FEED
46 3RD CL. EXHAUST
47 4TH FEED
48 1-2 ACCUMULATOR
Figure 58 Typical Spacer Plate

700-R4-56 HYDRAULIC DIAGNOSIS
1 LINE
2 D4
3 D2
4 LO
5 REVERSE
6 GOVERNOR
7 LO - IST FEED
8
LOIREVERSE
9 3RD ACCUMULATOR
10 T.V.
11 M.T.V.
12 ACCUMULATOR
13 4TH SIGNAL 14
2ND CLUTCH
1 5 3-4 ACCUMULATOR
16 T.V.F.
17 OVERRUN CLUTCH
18 T.V. EX.
19 D31PART THROTTLE
20 PART THROTTLE
21 D3
22 4TH CLUTCH
23 C.C. SIG.
24 MOD. UP
25 MOD. DOWN
26 DETENT 27
3-4 CLUTCH
28
DETENTILO
29 RND4-3
30 3RD CLUTCH
31 IDENTIFICATION
42 D4 ABUSE
43 3RD FEED
44 3-2
HIGH SPEED
45 2ND FEED
46 3RD CL. EXHAUST
47 4TH FEED
48 1-2 ACCUMULATOR
I JH0045-700R4 I Figure 59 Spacer Plate to Valve Body Gasket

HYDRAULIC DIAGNOSIS 700-R4-57
14 2ND CLUTCH
27 3-4 CLUTCH
15 3-4 ACCUMULATOR 28
DETENTILO 16 T.V.F.
29 RND4-3 17 OVERRUN CLUTCH 30 3RD CLUTCH
5 REVERSE
18 T.V. EX.
31 IDENTIFICATION
6 GOVERNOR
19
D31PART THROTTLE 42 D4 ABUSE
7 LO - 1ST FEED
20 PART THROTTLE
43 3RD FEED
8
LOIREVERSE 21 D3
44 3-2 HIGH SPEED
9 3RD ACCUMULATOR 22 4TH CLUTCH
45 2ND FEED
23 C.C. SIG.
46 3RD CL. EXHAUST
24 MOD. UP
47 4TH FEED
12 ACCUMULATOR 25 MOD. DOWN 48 1-2 ACCUMULATOR
13 4TH SIGNAL 26 DETENT
Figure 60 Spacer Plate to Case Gasket

700-R4-58 HYDRAULIC DIAGNOSIS
LlNE
D4
D 2
LO REVERSE
GOVERNOR
LO
- 1 ST FEED
LOIREVERSE
3RD ACCUMULATOR
T. V.
M.T.V.
ACCUMULATOR
(4TH)
4TH SIGNAL
2ND CLUTCH
3-4 ACCUMULATOR
T.V.F.
OVERRUN CLUTCH
T.V. EX.
D3lPART THROTTLE
PART THROTTLE
D 3
~TH CLUTCH
C.C. SIG.
MOD. UP
MOD. DOWN
DETENT
3-4 CLUTCH (3-2 EX)
DETENTILO
RND4-3
1-2 ACCUMULATOR
lure 6 1 Case Oil Passages and Checkball Locations
1 LINE 27 3-4 CLUTCH
3 DR-2
32
VOID 5 REVERSE 36 VENT
11 M.T.V. 39(a) LUBE TO COOLER
17 O.R. CLUTCH 39(b) LUBE FROM COOLER
23 CONV. CL.
SIG. 49 PRESSURE TAP
I JH0048-700R4 I Figure 62 Pump to Case Oil Passages A
CASE SERVO BORE
B SERVO EXHAUST HOLE
C 2ND
& 4TH BAND APPLY PASSAGE
D 3RD ACCUMULATOR PRESSURE TAP PASSAGE
80 RETAINER & BALL ASSEMBLY, 3RD ACCUM.
86 PLUG, CASE SERVO
1 JH0049-700R4 I Figure 63 Servo Oil Passages

HYDRAULIC DIAGNOSIS 700-R4-59
A 4TH OIL 21 SEAL, "0" RING
B 3RD ACCUMULATOR OIL 22 HOUSING, SERVO PISTON (INNER) C VALVE BODY FACE
23 RING,
OIL SEAL (2ND APPLY PISTON) (INNER)
D OIL PAN FLANGE
24 RING, OIL SEAL
(2ND APPLY PISTON) (OUTER)
E EXHAUST 25 PISTON, 2ND APPLY
F 2ND OIL
26 S'PRING, SERVO CUSHION
14 SEAL, "0" RING (2-4 SERVO COVER)
27 RETAINER, SERVO CUSHION SPRING 15 COVER, 2-4 SERVO 28 RING, RETAINER (2ND APPLY PISTON)
16 PISTON, 4TH APPLY
29 PIN, 2ND APPLY PISTON
17 RING, OIL SEAL (4TH APPLY PISTON)
31 SPRING, SERVO RETURN
(OUTER) 80 RETAINER
81 BALL ASSEMBLY, 3RD ACCUM.
18 RING, RETAINER (APPLY PIN) 86 PLUG, CASE SERVO
19 WASHER, SERVO APPLY PIN
20 SPRING, SERVO APPLY PIN JH0050.700R4
Figure 64 Servo Assembly