PONTIAC FIERO 1988 Service Repair Manual

700.R442 HYDRAULIC DIAGNOSIS
I 1
MANUAL U)
J JHOOPSPOR4 I Figure 39 Manual Lo

MANUAL LO
CONVERTEM CLUTCH - RELEASED
FORWARD CLUTCH - APPLIED
Maximum downhill braking can be obtained at speeds below 30 mph (48 kmlh) with the selector
in Lo (tat) range. Lollst oil pressure, which is 1206 kR I175 psi), is the same as second (2nd) oil pressure
because second (02) oil is still present.
Lo oil from the manual valve is directed to the following:
1* 1-2 Shift Valvelain
2. to and Reverse Clutch
3. Lo Overrun Valve
Lo oil at the 1-2 T.V. valve combined with the 1-2 throttle valve spring force will close the 1-2 shift
valve at speeds approximately 36 mph 156 km/h) or below. This allows 2nd oil to exhaust, releasing
the 2-4 band, and lo oil to apply the lo and reverse clutch.
Loflst oil coming off the 1-2 T.V* valve is directed toward the lo overrun valve that regulates lolreverse
oil. This smoothes the 2-1 manual downshift for maximum engine braking.
The forward clutch is applied. The lo and reverse, and the overrun clutch are applied to allow engine
braking.
The 2-4 band is released, the transmission is in Lo Range - First Gear.
HYDRAULIC DIAGNOSIS 700-RU3
OVEARUM CLUTCH - APPLIED
LO ROLLER CLUTCH - APPLIED
JH018&7WR4
Figure 40 Manual Lo

740uR444 HYDRAULIC PIAGIUOSIS
REVERSE
I JHQ02MDORO - Figure 4 1 Reverse

HYDRAULIC DIAGNOSIS 700-84-45
REVERSE
REVERSE INPUT CLUTCH - APPLIED
LO AND REVERSE CLUTCH - APPLIED
When the selector lever is moved to the Reverse (R) position, the manual valve is repositioned to allow
line pressure to enter the reverse passage which directs oil to the following:
1. Lo and Reverse Clutch
2. Reverse Input Clutch
3. Reverse Boost Valve
4. Lo Overrun Valve
Reverse oil is
orificed at the retainer and ball assembly, and regulated at the lo overrun valve to apply
the lo and reverse clutch.
Reverse oil is
orificed into the reverse input clutch and orificed out of the reverse input piston for a
smooth apply of the reverse input clutch during the shift.
Reverse oil acting on the reverse boost valve in the pressure regulator will boost line pressure to
approximately 670
kPa (100 psi). M.T.V. oil from the line bias valve acting on the T.V. boost valve,
in the pressure regulator, will further boost line pressure from 670
kPa (100 psi) at idle to 1690 kPa
(245 psi) at full throttle.
The reverse input clutch is applied. The lo and reverse clutch is applied. The transmission is in
Figure 42 Reverse

700.R4-46 HYDRAULIC DIAGNOSIS
A HOUSING COVER ASSEMBLY, CONVERTER E TURBINE ASSEMBLY
B SPACER, TURBINE THRUST
F STATOR ASSEMBLY
C PRESSURE PLATE ASSEMBLY
G THRUST BEARING ASSEMBLY
D SPRING, PRESSURE PLATE
H CONVERTER PUMP ASSEMBLY
"THE TORQUE CONVERTER CLUTCH ASSEMBLY CANNOT BE DISASSEMBLED. SHOWN HERE FOR
INFORMATION ONLY. SEE SECTION 7A FOR MORE INFORMATION.
3RD CL SWITCH
(COLOR ID-BLACK
4-3 SHIFT T.C.C. SOL
T.C.C. SOLENOID (N.C.)
ASSEMBLY WITH GREEN DOT)
I
+ 12v I
I
TERM. D TO 3RD CL SW 3RD CL T.C.C. SIG (COLOR ID-WHITE) (N.0.) (N.O.)
TERMINAL A TO
4-3 DOWNSHIFT SW
SW 4TH CL SW NORMALLY OPEN (N.O.) OLOR ID-WHITE)
NORMALLY CLOSED (N.C.) 4-3 SW TERMINALS
(COLOR ID-YELLOW)
4TH CL TERMINALS
(COLOR ID-BLUE)
MODELS: 4TH CLUTCH SW
(COLOR ID-BLACK
WlTH GREEN DOT) 2 TERMINALS

MODELS:
HYDRAULIC DIAGNOSIS 70O-R4-47
ERMINAL A TO
4-3 DOWNSHIFT SW
(COLOR ID-RED)
TERMINAL
B TO
4TH CLUTCH SW
(COLOR ID-WHITE)
4-3 SW TO 4TH CL SW
NORMALLY OPEN
(N.0.) (COLOR ID-WHITE) NORMALLY CLOSED (N.C.1
4-3 SHIFT TERMINAL
(COLOR ID-YELLOW)
4-3 DOWNSHIFT SW
(COLOR ID-BLACK)
2 TERMINALS
4TH CL TERMINALS
(COLOR ID-BLUE)
WITH GREEN DOT) 2 TERMINALS
3 DOWNSHIFT SW
NORMALLY OPEN
(N.0.) NORMALLY CLOSED (N.C.)
4-3 DOWNSHIFT SW
POS. SOL TERMINAL
TO 4-3 DOWNSHIFT SW
(COLOR ID-RED)
1988 MODELS
Figure
46 Wiring Diagram -Type 3

700.R4-48 HYDRAULIC DIAGNOSIS
I JH0034-700R4-R1 Figure 47 Wiring Diagram - Type 4
4-3 SHIFT I
I JH0035.700R4 J Figure 48 Wiring Diagram - Type 5

HYDRAULIC DIAGNOSIS 700.R4-49
T.C.C. SOL
(N.O. OIL
PATH) , --- --- ---,
T.C.C. SOLENOID
(COLOR ID-DK GREEN) 1988 MODELS: MCM, MTM,
PRM, TAM, TBM
Figure 49 Wiring Diagram -Type 8
I JH0037-700R4 I
Figure 50 Wiring Diagram - Type 7

700-R4-50 HYDRAULIC DIAGNOSIS
TERMINAL A TO
SOL POS. SIDE (COLOR ID-RED)
T.C.C. SOL
(N.O. Ol L PATH)
TERMINAL
B TO
1 TERMINAL NORMALLY
OPEN (N.O.) NORMALLY CLOSED (N.C.)
NEG. SOL TERMINAL \POS. SOL TERMINAL
TO TERMINAL D (COLOR ID-RED)
(CCC GROUND)
(COLOR ID-BLACK)
Figure
5 1 Wiring Diagram - Type 9
TERMINAL A TO
4-3 DOWNSHIFT SW
(COLOR ID-RED)
TERMINAL
D TO E.C.M. 4TH CLUTCH SW
(COLOR ID-BLACK)
4-3 DOWNSHIFT SW
(COLOR ID-BLACK)
2 TERMINALS
NORMALLY OPEN (N.O.) 4-3 SW TERMINALS
NORMALLY CLOSED (N.C.) (COLOR ID-YELLOW)
4TH CL TERMINAL
(COLOR ID-BLUE)
4TH CLUTCH SW
(COLOR ID-BLACK)
1 TERMINAL
POS. SOL TERMINAL
TO 4-3 DOWNSHIFT SW
988 MODELS: PAM P
I (COLOR ID-RED)
I
Figure 52 Wiring Diagram - Type 10

HYDRAULIC DIAGNOSIS 700-R4-51
OLEN NO ID AND "0" RING ASSEMBLY
(COLOR ID-PINK) 1988 MODELS
Figure
53 Wiring Diagram - Type 14
TERMINAL A TO
4-3 DOWNSHIFT SW
(COLOR ID-RED)
TERMINAL
B TO
4TH CLUTCH SWITCH
(COLOR ID-WHITE)
TEMP. SWITCH ASM.
CONNECTOR BODY
(COLOR ID-BLACK)
4-3 SHIFT TERMINAL
(COLOR ID-YELLOW)
4-3 DOWNSHIFT SW
(COLOR ID-BLACK BOD
2 TERMINALS
4TH
CL TERMINAL
(COLOR ID-BLUE)
4TH CLUTCH SW
(COLOR ID-METALLIC
OPTIONAL 4TH CL SW
POS, SO[ TERMINAL 'NEG. SOL TERMINAL (COLOR
ID-METALLIC
TO TERMINAL D 4-3 (CCC GROUND) & BLACK)
IDFRED' (COLOR ID-BLACK) NORMALLY
OPEN
(N.O.)
Y) NORMALLY CLOSED (N.C.)
TYPE 15
1988
MODELS: FAM, FMM,
MAM, MDM, MFM, MKM, MLM,
MPM, MRM, MWM, MXM, MZM,
THM, TJM, TKM, TLM, TUM,
TXM
JH0041-700R4-R1
Figure 54 Wiring Diagram - Type 15