1988 PONTIAC FIERO ignition

CRUISE CONTROL 98-3
CUUM BRAKE
-VARIABLE INDUCTANCE
POSITION SENSOR
-VENT SOLENOID AND VALVE
(NORMALLY OPEN)
6-- STEEL CORE
Fig. 3 Servo Unit
in the servo to increase the throttle opening. The
vent remains closed.
e Vehicle Gaining Speed (due to steep grades
or driver wishes to decrease speed by using the
Coast or 'tap-down' feature)
- The controller
de-energizes the vent solenoid to open the vent
valve to the atmosphere. This reduces vacuum in
the servo and allows the throttle return spring to
decrease the throttle opening. The vacuum valve
remains closed.
When the cruise system is engaged and operating
(without any interference from the driver via the mode
control switches), no speed correction will be made
until the car varies approximately
+ - 1/2 mph from set
speed.
When the controller senses an over or underspeed
condition it will pulse the opening of the vent or
vacuum valve. The pulse will be repeated as required
until the speed correction necessary brings the car to
the set speed. From any set speed, under normal road
load conditions, the vacuum valve will remain in a
completely open position when vehicle speed has The
ignition is turned off.
SPEED SENSORS
VSS
Buffer Amplifier
Figure 4
Fig. 4 VSS (Vehicle Speed Sensor)
This device supplies the vehicle speed input to the
controller on some cars. The optic head portion of the
VSS is located in the speedometer frame. A reflective
blade is attached to the speedometer
cable/head
assembly. The blade spins like a propeller, with its
blades passing through a light beam from a
L.E.D. in
the optic head. As each blade enters the
L.E.D. light
beam, light is reflected back to a photocell in the optic
head, causing a low power speed signal to be sent to the
buffer for amplification and signal conditioning. This
amplified signal is then sent to the cruise controller.
P. M. Generator
Figure 5
dropped 5mph below set speed. Likewise, when vehicle
speed has exceeded
3 mph over the set speed, such as This
device supplies the vehicle speed input to the
down a steep grade, the vent will go into ,-onstant open ~0ntI-011er on some cars. Vehicle speed information is
position. provided
to the controller by a P. M. (permanent
magnet) generator driven by the transmission. The
The servo go into an 'Pen vent position output frequency of the P. M, generator is sent to the under the following conditions:
buffer, which amplifies and conditions the signal to the
@ When the brake (or clutch) pedal is depressed. controller.
a An open variable inductance position sensor coil
in the servo.
a A loss of electrical power to the system.

CONTROL SWITCH CONTINUITY CHECK GREEN
WIRE, TOP, #2 YELLOW WIRE, BOTTOM, # 1 / (TERMINAL C)
/ / /
'< BLUE WIRE, TOP, #4 RED WIRE, BOTTOM, #3 (TERMINAL A) (TERMINAL D) C - CLOSED
1 CRUISE CONTROLLER (MODULE) CHECKS AT CONNECTOR
e IGNITION ON e CONTROLLER DISCONNECTE D
BRAKE
INPUT
SETICOAST INPUT
RESUME1
ACCEL. INPUT
GROUND
ONIOFF INPUT
INDICATOR LAMP SPS
HIGH SPS LOW
SPEED SIGNAL
VACUUM VALVE
CONTROL
I
BRAKE (AND CLUTCH) NOT DEPRESSED
BRAKE (AND/OR CLUTCH) DEPRESSED
SLIDER SWITCH "ON"
- SETICOAST DEPRESSED
SLIDER SWITCH "ON" - SET/COAST NORMAL
SLIDER SWITCH "OFF" - SETICOAST NORMAL
SLIDER SWITCH "RIA" POSITION
SLIDER
SWITCH "ON" - SET/COAST DEPRESSED OR NORMAL
SLIDER SWITCH "OFF" - SETICOAST DEPRESSED OR NORMAL
MEASURED TO VEHICLE GROUND
SLIDER SWITCH "ON"
SLIDER SWITCH "OFF"
- SETICOAST DEPRESSED OR NORMAL
CRUISE ARMED
MEASURED BETWEEN PlNS
F & H - SERVO CONNECTED
MEASURED BETWEEN PlNS F & # - SERVO DISCONNECTED
SEE CHART (DIAGNOSTIC) ON SPEED SENDER TEST
MEASURED TO GROUND
- SERVO CONNECTED
MEASURED TO GROUND - SERVO NOT CONNECTED
MEASURED TO GROUND
- SERVO CONNECTED
MEASURED TO GROUND - SERVO NOT CONNECTED
1 SERVO CHECKS
SERVO CONNECTOR DISCONNECTED a MEASURE AT SERVO PlNS
STATED VALUE REPLACE SERVO)
1 A 1 VENT VALVE 1 30-50 n MEASURED BETWEEN PINS A AND C I (IF MEASURED RESISTANCE IS NOT STATED VALUE REPLACE SERVO)
Fig. 6 Controller, Servo & Control Switch Check

CRUISE CONTROL 9B-7
1 -CABLE
2-CAP
( W/O A/C )
3-FORWARD LAMP HARNESS
4-VACUUM TANK
5-SERVO 6-RETAINER
7-24
N.m (1 8 LBS. FT.)
8-ACCELERATOR CABLE
9-ENGINE BRACKET
10- 6 Nern (54 LB. IN.)
11-CARE. LEVER
CABLE ADJUSTMENT PROCEDURE
1-WITH CABLE 1 INSTALLED IN ENGINE BRACI SPUD ON LEVER SO STUB ENGAGES SLOT IN
CABLE END. ASSEMBLE CABLE TO CARBIJRETOR LEVER STUB WITH RETAINER 6 AND RELEASE
CARBURETOR LEVER.
2- CAUT1BN THROTTLE MUST BE COMPLETELY
CLOSED. (IGNITION OFF-FAST IDLE CAM OFF)
3-PULL SERVO ASM. END OF CABLE TOWARD SERVO
WITHOUT MOVING CARBURETOR LEVER.
4-IF ONE OF THE
SIX HOLES IN THE SERVO ASM. TAB
LINES UP WlTH CABLE PIN, CONNECT PIN TO TAB
WlTH RETAINER 6 .
5-IF A TAB HOLE DOES NOT LINE UP WITH THE PIN,
MOVE THE CABLE AWAY FROM
THE SERVO ASM. UNTIL THE NEXT CLOSEST TAB HOLE LINES UP
ANBCONNECT PIN TO TAB WITH RETAINER 6 .
Fig. 603 Vacuum Harness and Cable Routing - VIN E

MISCELLANEOUS ACCESSORIES 96-4
SCELLANEOUS ACCESSOR
General Description ................................. 9G-1
Rally Gages .................................................. 9G- 1
Tachometer ................................................. 9G- 1
Trip Odometer
............................................. 9G- 1
Electric Rear Window Defogger ................. 9G-2
Power Remote Control Rearview
Mirror ........................................................ 9G-2
Diagnosis .................................................... 9G-2
Rally Gages ............................................... 9G-2
Tachometer .................................... .... .... 9G-2
Electric Rear Window Defogger ................. 9G-2
Power Remote Control Rearview
Mirror ........................................................ 96-2
Dash and Console Mounted
Accessory Switches
................................. 9G-4
General Description .................................. 9G-4
Electronic Glare Control Mirror ................. 9G-4
On-Car Service ............................................. 9G-4
Rally Gages, Tach ....................................... 96-4.
Rear Window Defogger ............................ 96-4.
Power Remote Control Mirror .................... 9G-4
GENERAL BESCRIP"T0N
RALLY GAGES
Figure I
The Rally Gage option, available on most models,
consists of an engine water temperature gage, an oil
pressure gage and a voltmeter.
These gages are incorporated into the instrument
cluster and replace the standard warning lamps. The
water temperature and oil pressure gages are
electrically operated from sending units mounted in the
cylinder head and oil filter base respectively. The
voltmeter registers regulated voltage, providing an
indication of the charging system's ability to keep the
battery charged. Continuous readings in either the high
or low voltage red bands can indicate improper voltage
regulation, broken or slipping alternator belt,
a shorted
alternator diode
or a defective battery. Readings in the
yellow band are normal with the engine idling or for
short periods after long engine cranking. However,
continuous readings in the yellow band can indicate
faulty operation. See Section
8A for diagnosis.
TACHOMETER
Figure 2
The tachometer indicates speed of the engine in
revolutions per minute (RPM). The engine can safely
be operated up to a maximum RPM as indicated by the
start of the red bar. Engine operation with tachometer
readings in the red area can lead to serious engine
damage.
Due to its dual-coil design, the tachometer may
not return to zero when the ignition
is turned oft: This
is
a normal condition and should not be diagnosed as
a problem in the tachometer.
TRIP ODOMETER
The trip odometer can be reset by twice fully
depressing the push button located on the right side of
the speedometer cluster. The first depression shows all
zeroes, and the second locks them in position. Both
depressions must be done to avoid possible half cycling
I -SERVICE ENGINE SOON
2-BRAKE WARNING LIGHT
3-CHOKE WARNING LIGHT
4-VOLTMETER
5-COOUNT TEMP. GAGE
6-FUEL GAGE
7-SEAT BELT LIGHT
8-OIL PRESSURE GAGE G20003 9G
Fig. 1 Rally Gages - Typical
of the trip odometer. A slow, steady push should be
used to avoid damage to the internal mechanism.
Do not reset the odometer with the
vehicle in motion. Damage to the odometer
may occur.
The trip odometer does not affect service
procedures for speedometers listed in Section
8C.

9G-2 MISCELLANEOUS ACCESSORIES
Fig. 2 Tachometer - Typical
RPMX I00 €31-
ELECTRIC REAR WINDOW DEFOGGER
surface of the rear glass. Current is applied to this grid
through a control switch on the instrument panel to
warm and defog the glass. A defogger timer, which is
also activated when the switch is depressed, allows
current flow through the rear window grid
for
approximately 10 minutes on first application
(approximately
5 minutes on subsequent applications)
and automatically shuts off the system. The system can
be turned off at any time by pushing the control switch
to the "OFF" position. The system is designed to
operate only when the ignition is on and must be
reactivated whenever the ignition has been turned off
and turned on again. Care should be exercised when
cleaning the inside rear glass so as not to scratch or
remove any of the grid material. Damage to the grid
could cause an open circuit. A monitor lamp in-the
control switch indicates power being fed to the rear
window grids so the operator can determine when the
system is operating.
The electric rear window defogger system
incorporates an electrical grid fused to the inside
POWER REMOTE CONTROL REARVIEW
MIRROR
Electric powered remote control mirrors are
available with a control that allows the mirrors to be
adjusted from the driver's seat.
RALLY GAGES ELECTRIC REAR WINDOW DEFOGGER
Diagnosis of individual rally gages is found in
Section
8A Figure 4
TACHOMETER To check for moper o~eration of the rear window
1. Insure that the in-line or fuseblock fuse is not
blown. (See Section 8A for wiring information.)
2. With ignition off, remove the tachometer from
the cluster to gain access to the connectors. Turn
ignition on and check for
12 volts at the power
input connector
(pink/black) and no voltage at
ground (black). Connect a test light to the brown
wire which connects to the "TACH" terminal of
the distributor. With the engine idling, a test light
should light with approximately the same
intensity as when attached to
12 volts. As the
engine speed increases, the test light intensity
should decrease.
3. If proper signals are present at the connector,
replace the gage. If not, the problem is in the
wiring to the gage.
Some tachometers use a circuit shorting bar
to accommodate usage on several engine
models. If tachometer readings are
significantly wrong (for example, tach reads
2900 RPM with engine at 2000 RPM),
check for a shorting bar on the back of the
tach and insure proper position (Figure
3).
If position is correct, tach must be repaired.
(Not all tachometers use a shorting bar).
Due to its dual-coil design, the tachometer
may
- grid, start the engine a& actuate the system by
depressing the control switch to the
"ON" position.
Contact one probe of a test lamp to one of the left side
rear window garnish molding screws. With the other
test lamp probe tip removed (so as not to damage the
grid), contact the bare wire to the grid adjacent to the
garnish molding. The test lamp should glow at full
brilliance. Contact the same grid line midway across
the window. The lamp should glow at half brilliance.
Repeat the procedure for each grid line. If an open
circuit exists in a grid line between the left side and the
center, the test lamp will not glow. If there is an open
circuit between the center and the right side, the test
lamp will glow more brilliantly at the center than if the
line were unbroken.
Rear window grid repairs may be made by
following the procedure published in
Section 2H of the
Body Service Manual.
The electric defogger system, wiring and
troubleshooting, is covered in Section
8A, "Electrical
Diagnosis". A quick-check troubleshooting guide is
shown.
POWER REMOTE CONTROL REARVIEW
MIRROR
not return to zero when tvhe ignition is turned off'.
This is a normal condition and should not be The
repair and mounting of the mirror assemblies
diagnosed as a problem in the tachometer. is
covered in the Body Service Manual.

96.4 MISCELLANEOUS ACCESSORIES
DASH AND CONSOLE MOUNTED ACCESSORY
SWITCHES
Installation for various dash and console
mounted accessory switches is shown in Section
8C.
GENERAL DESCRIPIIOM
ELECTRONIC GLARE CONTROL MIRROR
Service procedures regarding this mirror are
found in the Body Section of this manual.
Fig. 601 EGC Mirror
The EGC mirror has light sensors which monitor
activity in front and back of the mirror and compensate
for brightly lit or extremely dark driving conditions.
After glare is no longer detected in the night mode, a
short time delay is automatically activated, preventing
unnecessary changing as traffic moves in and out
behind the car.
As an added feature, the Automatic
Day/Night
Mirror will hold in the normal viewing mode whenever
the shift selector is placed in reverse. This assures you
of a bright, clear view while backing up.
The Automatic Mirror with EGC (Electornic
Glare Control) is a technological breakthrough using
advanced computer circuitry. It is powered by the
vehicle electrical system and requires no batteries or
scheduled maintenance. Power is drawn only when the
ignition is on.
Illuminated Distance Dial provides a full
range of adjustments to match your eye sensitivity.
Night Mode Indicator illuminates green when
mirror switches to the non-glare position.
Light Sensors monitor ambient lighting
conditions and
headlamp glare, then adjust the mirror
accordingly.
Auto-Off Switch allows fully automatic
operation or manual selection.
ON-CAR SERVICE
RALLY GAGES, TACH REAR WINDOW DEFOGGER
Remove
and Replace
The electric defogger system, available on all
models, is covered in Section
8A. Electrical diagnosis
and grid repair is covered in Body Service Manual.
Removal of the entire gage cluster assembly is not
POWER RmOTE CONTROL REARVIEW
required to service the individual rally gages and/or MIRROR
tachometer.
Electric powered remote control mirrors are
available with a console mounted control that allows
To replace the rally gages, remove the lower and the
mirrors to be adjusted from the driver's seat. The
upper trimplates. Remove the trip odometer reset knob repair
and mounting of the mirror assemblies are
(if so equipped) and gage cluster lens from the front covered in
the Body Service Manual. Location and
(see Section
8C). installation of the control switch is shown in Figure
603.
To replace the tachometer by itself, remove the
lower trimplates, the trip odometer reset knob (if so
equipped) and the instrument cluster lens. Remove the
gage from the cluster. Refer to Section
8C for
hstrument panel cluster removal.

GENERAL INFORMATION - F STYLE 1 H-1
SECTION IH
GENERAL NFORMAT
NOTICE: The anti-theft label found on some major sheet metal, engines, and transmissions must be masked
prior to painting, rustproofing, undercoating, etc. The mask
must be removed following the above operations.
Failure to keep the label clean and readable may result in liability for violation of Federal Vehicle Theft Prevention
Standard, and subject the vehicle owner to possible suspicion that the part was stolen.
Lock Cylinder Coding
..................................... I H-1 Chip Resistant Plastisol Material .................... 1 H-8
...................................................... Lubrication 1 H-2 Flexible Exterior Plastic Parts ......................... 1H-9
Adhesive Body Side Moldings ......................... 1H-3 Metal Replacement Parts Finishing ................ lH-13
Waterleak Diagnosis and Repair ..................... 1H-3 Interior Plastic Trim Parts Finishing .............. 1H-13
.................................................... Anticorrosion Treatment ................................ IH-4 Special Tools I H- 14
LOCK CYL!NDER CODING o Check key operation in the lock cylinder.
KEY IDENTIFICATION AND USAGE
REPLACEMENT LOCK CYLINDERS
The lock cylinder keyway is designed so that
other model keys will not enter a current model lock
cylinder. Two noninterchangeable keys are used.
CB Square headed key is used in the ignition lock
cylinder.
o Oval headed key is used in all other lock
cylinders.
Key identification is obtained from the four
character key code stamped on the knockout portion
of the key head and an identification letter stamped on
the key shank. After the code number has been
recorded by the owner, the plugs should be knocked
out of the key head. From these numbers, the lock
combination can be determined by use of a code list
(available to owners of key cutting equipment from
equipment suppliers). If key code numbers are not
available from records or from the knockout plug, the
lock combination (tumbler numbers and position) can
be determined by laying key on diagram in Figure
1.
I POSITION LEVELS I
Fig. 1 - Key Code Diagram
CUTTING KEYS
Lock cylinders are available from service parts
warehouses. The new cylinder has a locking bar staked
in place. Tumblers are also available and must be
assembled into the cylinder.
ASSEMBLING AND CODING LOCK CYLINDERS
All Lock Cylinders Except Rear Stowage
Compartment
Tumblers for all locks are shaped exactly alike
with the exception of the notch position on one side.
As the key is inserted in the lock cylinder, tumblers are
lowered to the correct height so that notches on each
tumbler are at the same level. When the notches on all
six tumblers line up, the side bar is pushed into the
notches by two small springs. This allows the cylinder
to turn in its bore. Five types of tumblers are used to
make the various lock combinations. Each tumbler is
coded according to a number,
1 through 5, stamped on
its side.
Assemble (Figs. 2 and 3)
1. Determine tumbler numbers and arrangement.
a. With numerical
key code, use code list
provided by key cutting equipment supplier.
b. Without numerical
key code or without
code list, refer to Figure
1.
o Lay key on key code diagram. Be sure
key is outlined by diagram.
Determine special code from the code list or the
key code diagram (Fig.
1). 3.
o Cut a blank key to the proper level for each of six
tumbler positions.
4.
Start with position number one. Find
and record lowest level (tumbler
number) that is visible. Repeat for
each of the remaining five positions.
Starting with position one [open end or head of
cylinder), insert tumblers in their proper slots in
the order called for by the code (Fig.
2).
Pull side bar out with fingers so that tumblers will
drop completely into place.
Insert one tumbler spring above each tumbler.

2H-6 STATIONARY GLASS - F STYLE
all traces of factory installed adhesive must be
removed prior to reinstallation.
5. Wipe sanded mirror support with clean paper
towel saturated with alcohol and allow to dry.
6. Follow directions on manufacturer's kit to
prepare
rearview mirror support prior to
installation on glass.
7. Properly position support to its premarked
location, with rounded end pointed upward; press
support against glass for 30 to 60 seconds,
exerting steady pressure against glass. After five
minutes, any excess adhesive may be removed
with an alcohol moistened paper towel or glass
cleaning solution.
8. Reinstall mirror
4. LOCATING CIRCLE AND BASE OF SUPPORT
LINE ON OUTSIDE GLASS SURFACE
2. CIRCLE ON OUTSIDE GLASS SURFACE
INDICATES AREA TO BE CLEANED
G94301-11 B.BG
Fig. 8-Locating Bonded earv view Mirror Support on
Glass
REAR WlMBOW DEFOGGER
The optional rear window defogger system
consists of a tinted glass that has a number of
horizontal ceramic silver compound element lines and
two vertical bus bars baked into the inside surface
during the glass forming operation. The feed wire or
terminal is soldered to the bus bar on the side. The
ground wire or terminal is soldered to the bus bar on
the right side.
The system operates on 12 volts. Under some
conditions, heat from the glass may not be detected by
finger touch. The length of time required to remove
interior fog from the back glass will vary with such
conditions as vehicle speed, outside glass temperature
and atmospheric pressure and number of passengers. This
system uses an instrument panel mounted
switch with an integral indicator lamp; and will operate
for five to ten minutes and automatically turn off
through the use of an automatic timer. The system can
be turned off during this operating period by turning
either the instrument panel mounted switch or ignition
switch to off.
Testing Grid Lines
To locate inoperative grid lines, start engine and
turn on the rear window defogger system. Ground one
test lamp lead and lightly touch the other prod to each
grid line. Figure
9 illustrates the pattern of test lamp
brilliance to be expected with a properly functioning
grid.
If test lamp bulb shows full brilliance at both ends
of grid lines, check for loose ground wire contact to
body metal.
Fig. 9-Test Lamp Bulb Brilliance Zones - Normal
Operating Rear Window Defogger
The range of zones in Figure 9 may vary slightly
from one glass to another; however, the bulb brilliance
will decrease proportionately to the increased
resistance in the grid line as the prod is moved from the
left bus bar to the right.
All grid lines must be tested in at least two places
to eliminate the possibility of bridging a break. For best
results, contact each grid line a few millimeters (inches)
either side of the glass centerline. If an abnormal light
reading is apparent on a specific grid line, place test
lamp prod on that grid at the left bus bar and move
prod toward the right bus bar until light goes out. This
will indicate a break in the continuity of the grid line
(Fig.
10).
Grid Line Repair
Tools Required:
o Part No. 1052858 (or equivalent) - Rear Window
Defogger Repair Kit
e Heat gun - capable of 260°C (500°F)
Remove or Disconnect
Battery 'feed - rear window defogger system