steering CHEVROLET DYNASTY 1993 Workshop Manual

(4) Provide communication to the DRB II while in
the Antilock brakes diagnostic mode. The CAB continuously monitors the speed of each
wheel, through the signals generated at the Wheel
Speed Sensors. This is used to determine if any
wheel of the vehicle is beginning to lock-up (skid)
when the brakes are applied. When a wheel locking
tendency is detected during brake apply. The CAB
commands the appropriate Build/Decay valves to
modulate brake fluid pressure in some or all of the
hydraulic circuits. The CAB continues to control
pressure in individual hydraulic circuits until a lock-
ing tendency is no longer present. The ABS system is constantly monitored by the
CAB for proper operation. If the CAB detects a fault,
it will turn on the Amber Antilock Warning Lamp
and disable the ABS brake system. The normal Non
ABS brake system will remain operational. The CAB contains a self-diagnostic program which
will turn on the Amber Antilock Warning Lamp
when a system fault is detected. Faults are stored in
a diagnostic program memory. There are 16 fault
codes which may be stored in the CAB and displayed
through the DRB II. These fault codes will remain in
the CAB memory even after the ignition has been
turned off. The fault codes can be cleared by using
the DRB II diagnostics tester, or they will be auto-
matically cleared from the memory after (50) ignition
switch on/off cycles.
CONTROLLER ANTILOCK BRAKE (INPUTS)
² Four wheel speed sensors.
² Stop lamp switch.
² Ignition switch.
² System relay voltage.
² Ground.
² Pump/Motor Relay Monitor
² Diagnostics Communications
CONTROLLER ANTILOCK BRAKE (OUTPUTS)
²4 Build/Decay valves.
² Antilock warning lamp.
² System relay actuation.
² Diagnostic communication.
² Pump/Motor relay actuation
DIAGNOSTIC CONNECTOR
The Bendix Antilock 4 Brake System diagnostic
connector is located under the fuse panel access
cover. The access cover is located on the lower sec-
tion of the instrument panel to the left side of the
steering column. The diagnostics connector is a blue
6 way connector see (Fig. 9).
ANTILOCK SYSTEM RELAYS AND WARNING LAMPS
SYSTEM RELAY
The ABS Modulator Valves are powered through
the System Relay which is located on a bracket
mounted to the CAB (Fig. 10). The System Relay
provides power to the CAB for modulator valve oper-
ation (pins 47 and 41) after the startup cycle when
the ignition is turned on.
Fig. 8 CAB Location
Fig. 9 Antilock Diagnostic Connector Location
Fig. 10 System Relay Location On The CAB
Ä ANTILOCK 4 BRAKE SYSTEM 5 - 19

BENDIX ANTILOCK 4 MODULATOR ASSEMBLY BLEEDING PROCEDURE
(1) Assemble and install all brake system compo-
nents on the vehicle, making sure all hydraulic fluid
lines are installed and properly torqued. (2) Bleed the base brake system, using ONLYthe
bleeding procedure outlined in the Service Adjust-
ments section of this service manual supplement. To perform the bleeding procedure on the ABS modu-
lator assembly, the battery, battery tray and acid shield
must be removed from vehicle. Then reconnect the
vehicle's battery to vehicle's battery cables, using
ONLY approved battery jumper cables. (3) Connect the DRB Diagnostics Tester to the vehi-
cle's diagnostics connector. The vehicle diagnostic con-
nector is located behind the fuse panel access cover on
the lower section of the dash panel left of the steering
column. The diagnostic connector is a blue 6 way
connector. (4) Using the DRB check to make sure the CAB does
not have any stored fault codes. If it does, remove them
using the DRB.
WARNING: WHEN BLEEDING THE MODULATOR AS-
SEMBLY WEAR SAFETY GLASSES. A CLEAR BLEED
TUBE MUST BE ATTACHED TO THE MODULATOR
BLEED SCREWS AND SUBMERGED IN A CLEAR
CONTAINER FILLED PART WAY WITH FRESH CLEAN
BRAKE FLUID. DIRECT THE FLOW OF BRAKE FLUID
AWAY FROM THE PAINTED SURFACES OF THE VE-
HICLE. BRAKE FLUID AT HIGH PRESSURE MAY
COME OUT OF THE BLEEDER SCREWS, WHEN
OPENED.
When bleeding Antilock modulator assembly, the
following bleeding sequence MUSTbe followed to
insure a complete bleeding of all air from the Antilock
brake, and base brake hydraulic systems. The modu-
lator assembly can ONLY be bled using a manual
bleeding procedure to pressurize the hydraulic
system.
MODULATOR ASSEMBLY CIRCUIT BLEEDING PROCEDURE AND SEQUENCE
1 MODULATOR PRIMARY CHECK VALVE CIRCUIT
Note: To bleed hydraulic circuits of the Bendix
Antilock 4 Brake System modulator assembly,
the aid of a second mechanic or helper will be
required to pump the brake pedal. (1) Install a clear bleed tube (such as Tygon) on
primary check valve circuit bleed screw (Fig. 1). Then
install bleed tube into a clear container partially filled
with fresh clean brake fluid (Fig. 1). (2) Pump brake pedal several times, then apply and
hold a constant medium to heavy force on brake pedal. (3) Open primary check valve circuit bleed screw
(Fig. 1) at least 1 full turn to ensure an adequate flow
of brake fluid. Continue bleeding primary check valve
circuit until brake pedal bottoms. (4) After brake pedal bottoms, close and tighten
bleed screw. Then release brake pedal. Do not release
brake pedal prior to closing and tightening bleed
screw. (5) Continue bleeding modulator assembly, repeat-
ing steps 2 through 4 until a clear, bubble free flow of
brake fluid is evident. (6) When all air is bled from primary check valve
circuit, tighten bleed screw and remove bleed hose
from bleed screw. Do not remove bleed hose before
tightening bleed screw, air may re-enter modula-
tor. (7) Torque modulator assembly primary bleed screw
to9N Im (80 in. lbs.).
2 MODULATOR SECONDARY CHECK VALVE CIRCUIT (1) Move clear bleed tube to secondary check valve
circuit bleed screw (Fig. 2). Then install bleed tube into
a container partially filled with fresh clean brake fluid
(Fig. 2). (2) Pump brake pedal several times, then apply and
hold a constant medium to heavy force on brake pedal. (3) Open secondary check valve circuit bleeder screw
(Fig. 2), at least 1 full turn to ensure an adequate flow
of brake fluid. Continue to bleed secondary check valve
circuit until the brake pedal bottoms.
Fig. 1 Bleeding Modulator Assembly Primary Check Valve Circuit
5 - 26 ANTILOCK 4 BRAKE SYSTEM Ä

(4) Carefully, pull sensor assembly grommet from
fender shield. (5) Unplug speed sensor connector from vehicle
wiring harness. (6) Remove the sensor assembly grommets from
the retainer brackets. (7) Remove sensor head screw.
(8) Carefully, remove sensor head from steering
knuckle. If the sensor has seized, due to corrosion,
DO NOT USE PLIERS ON SENSOR HEAD. Use
a hammer and a punch and tap edge of sensor ear,
rocking the sensor side to side until free.
INSTALLATION
(1) Connect the wheel speed sensor connector to
the wiring harness. (2) Push sensor assembly grommet into hole in
fender shield. Install clip and screw. (3) Install the 2 screws that fasten the speed sen-
sor routing tube to the frame rail. (4) Install sensor grommets in brackets on fender
shield and strut damper. (5) Coat the speed sensor with High Temperature
Multi-purpose E.P. Grease before installing into the
steering knuckle. Install screw tighten to 7 N Im (60
in. lbs.)
CAUTION: Proper installation of wheel speed sen-
sor cables is critical to continued system operation.
Be sure that cables are installed in retainers. Fail-
ure to install cables in retainers, as shown in this
section, may result in contact with moving parts
and/or over extension of cables, resulting in an
open circuit.
REAR WHEEL SPEED SENSOR (FIGS. 10 AND 11)
REMOVAL
(1) Raise vehicle and remove wheel and tire as-
sembly. (2) Remove sensor assembly grommet from under-
body and pull harness through hole in underbody. (3) Unplug connector from harness.
(4) Remove sensor assembly grommets from
bracket which is screwed into the body hose bracket,
just forward of trailing arm bushing (batwing brack-
et.) (5) Remove sensor and brake tube assembly clip,
located on the inboard side of trailing arm. (6) Remove sensor wire fastener from rear brake
hose bracket. (7) Remove outboard sensor assembly retainer nut.
This nut also is used to capture the brake tube clip. (8) Remove sensor head screw.
(9) Carefully, remove sensor head from adapter as-
sembly. If the sensor has seized, due to corrosion, DO
NOT USE PLIERS ON SENSOR HEAD. Use a ham-
mer and a punch and tap edge of sensor ear, rocking
the sensor side to side until free.
INSTALLATION Installation is reverse order of removal. Be sure to
coat sensor with High Temperature Multi-purpose
E.P. Grease before installing into adapter assembly.
Tighten screw to 7 N Im (60 in. lbs.) torque.
Fig. 9 Front Wheel Speed Sensor Routing
5 - 44 ANTILOCK 4 BRAKE SYSTEM Ä

(2) Adjust belt tension by applying torque to
square hole C on idler bracket. Adjust tension to
specification given in Belt Tension Chart. (3) Tighten in order, first, locking screws B then
pivot screw A to 54 N Im (40 ft. lbs.).
POWER STEERING PUMPÐS TYPE
(1) From on top of the vehicle loosen locking screw G.
(2) From under the vehicle loosen the pivot screw
and pivot nut H . (3) After installing a new belt adjust belt tension
with 1/2 in. breaker bar installed in adjusting
bracket. See tension specification in chart. (4) Tighten locking screw G to 54 N Im (40 ft. lbs.).
(5) Tighten pivot screw H and the pivot nut to 54
N Im (40 ft. lbs.)
GENERATOR BELT
(1) Loosen T-Bolt locking nut E and adjusting
screw F to remove and install Poly V belt and/or ad-
just belt tension. (2) Tighten adjusting screw F to adjust belt tension
to specification shown in Belt Tension Chart. (3) Tighten T-Bolt locking nut E to 54 N Im (40 ft.
lbs.).
3.0L ENGINE BELTS REMOVE/INSTALL AND
ADJUST
AIR CONDITIONING BELT
To remove and install the air conditioning com-
pressor drive belt, first loosen the idler pulley lock
nut, then turn the adjusting screw to raise or lower
the idler pulley (Figs. 3 and 4).
To adjust the air conditioning drive belt, loosen
the idler pulley nut (Fig. 3) and adjust belt tension
Fig. 2 Accessory Drive BeltsÐ2.2 and 2.5L Engines
Fig. 3 Accessory Drive BeltsÐ3.0L Engine
Ä COOLING SYSTEM 7 - 25

by tightening adjusting screw (Figs. 3 and 4 ).
Tighten pulley nut to 54 N Im (40 ft. lbs.) after ad-
justment.
GENERATOR/POWER STEERING PUMP BELT
The Poly-V generator/power steering pump belt is
provided with a dynamic tensioner (Fig. 5) to main-
tain proper belt tension. To remove or install this
belt, Release tension by rotating the tensioner clock-
wise
3.3/3.8L AND TURBO III ENGINE ACCESSORY
DRIVE BELT REMOVE AND INSTALL
GENERATOR, POWER STEERING PUMP, AIR
CONDITIONING COMPRESSOR AND WATER
PUMP DRIVE BELT The Poly-V Drive belt is provided with a dynamic
tensioner (Figs. 7 and 8) to maintain proper belt ten-
sion. To remove or install this belt. (1) Raise vehicle on hoist.
(2) Remove right front splash shield.
(3) Release tension by rotating the tensioner clock-
wise (Figs. 7 and 8). (4) Reverse above procedure to install.
Fig. 5 Release Belt Tensioner
Fig. 6 Belt Tension Chart
Fig. 4 Air Conditioning Belt Idler
7 - 26 COOLING SYSTEM Ä

(6) For installation, reverse above procedure.
Tighten all fasteners to the proper torque. Refer to
the Torque Specifications chart at the rear of this
group.
GENERATOR REPLACEMENTÐ3.3L/3.8L ENGINE
(1) Disconnect battery negative cable (Fig. 1).
(2) Remove generator drive belt. Refer to Group 7,
Cooling System. (3) Loosen, but do not remove the nut on the sup-
port bracket at exhaust manifold (Fig. 8). (4) Remove the generator tensioner power steering
bracket bolt. (5) Remove the tensioner stud nut and the ten-
sioner (Fig. 9). (6) Remove the generator mounting bolts (Fig. 9).
(7) Remove the power steering reservoir from the
generator mounting bracket. (8) Remove the three generator support bracket
bolts (Fig. 8). (9) Remove intake plenum to generator mounting
bracket bolt. (10) Remove generator support bracket (Fig. 9).
(11) Position the generator to gain access to wiring
and remove wiring from generator. (12) Remove generator.
(13) For installation, reverse above procedures.
Tighten all fasteners to the proper torque. Refer to
the Torque Specifications chart at the rear of this
group.
Fig. 7 Remove or Install Generator Mounting BoltsÐ3.0L Engine
Fig. 8 Support BracketFig. 9 Generator/Generator Support BracketÐ3.3L/ 3.8L Engine
Ä BATTERY/STARTER/GENERATOR SERVICE 8B - 11

IGNITION SWITCH
IGNITION SWITCH AND KEY CYLINDER SERVICE
The ignition switch is located on the steering col-
umn. The Key In Switch is located in the ignition
switch module. For diagnosis of the Key In Switch,
refer to Section 8M.
REMOVAL
If the vehicle has a floor mounted gear shifter,
place the selector in the Park position. (1) Disconnect negative cable from battery.
(2) If the vehicle has a tilt column, remove the tilt
lever by turning it counterclockwise. (3) Remove upper and lower covers from steering
column.
(4) Remove ignition switch mounting screws. Use
tamper proof torx bit Snap-on TTXR15A2, TTXR20A2
or equivalent to remove the screws (Fig. 1). (5) Gently pull switch away from the column. Release
connector locks on the 7 terminal wiring connector,
then remove the connector from the ignition switch.
(6) Release connector lock on the 4 terminal con-
nector, then remove the connector from the ignition
switch. (7) To remove the key cylinder from the ignition
switch: (a) Insert key in the ignition switch. Turn the
key to the LOCK position. Using a small screw-
driver, depress the key cylinder retaining pin until
it is flush with the key cylinder surface (Fig. 2). (b) Rotate the key clockwise to the OFF position.
The key cylinder will unseat from the ignition
switch (Fig. 3). When the key cylinder is unseated,
it will be approximately 1/8 inch away from the ig-
nition switch halo light ring. Do not attempt to
remove the key cylinder at this time. (c) With the key cylinder in the unseated posi-
tion, rotate the key counterclockwise to the lock po-
sition and remove the key. (d) Remove key cylinder from ignition switch
(Fig. 4).
INSTALLATION
If the vehicle has a floor mounted gear shifter,
place the selector in the Park position.
IGNITION SWITCH DESIGNATIONS
Fig. 1 Ignition Switch Screw Removal
Fig. 2 Key Cylinder Retaining Pin
Ä IGNITION SYSTEMS 8D - 45

(1) Connect electrical connectors to the ignition
switch. Make sure that the switch locking tabs are fully
seated in the wiring connectors. (2) Before attaching the ignition switch to a tilt
steering column, the transaxle shifter must be in the
Park position. Also the park lock dowel pin and the
column lock flag must be properly indexed before
installing the switch (Fig. 5). (a) Place the transaxle shifter in the PARK posi-
tion. (b) Place the ignition switch in the lock position.
The switch is in the lock position when the column
lock flag is parallel to the ignition switch terminals
(Fig. 5). (c) Position ignition switch park lock dowel pin so
it will engage the steering column park lock slider
linkage (Fig. 6). (d) Apply a light coating of grease to the column
lock flag and the park lock dowel pin.
(3) Place the ignition switch against the lock hous-
ing opening on the steering column. Ensure ignition
switch park lock dowel pin enters the slot in the park
lock slider linkage in the steering column. (4) Install ignition switch mounting screws. Tighten
screws to 2 N Im (17 in. lbs.) torque.
(5) Install steering column covers. Tighten screws to
2N Im (17 in. lbs.) torque.
(6) If the vehicle is equipped with a tilt steering
column, install the tilt lever. (7) To install the ignition key in the lock cylinder:(a) With the key cylinder and the ignition switch
in the Lock position, insert the key cylinder into the
ignition switch until it bottoms. (b) Insert ignition key into lock cylinder. While
gently pushing the key cylinder in toward the igni-
tion switch, rotate the ignition key until to the end of
travel. (c) Connect negative cable to battery.
(8) Check for proper operation of the halo light, shift
lock (if applicable), and column lock. Also check for
proper operation of the ignition switch accessory, lock,
off, run, and start positions.
Fig. 3 Unseated Key Cylinder
Fig. 4 Key Cylinder Removal
Fig. 5 Ignition Switch View From Column
Fig. 6 Ignition Switch Mounting Pad
8D - 46 IGNITION SYSTEMS Ä

MECHANICAL/ELECTRONIC CLUSTER REMOVAL
CLUSTER BEZEL REMOVAL
(1) On column shift vehicles, place column shifter
to neutral position. (2) On tilt steering column vehicles, adjust tilt
range to lowest position. (3) Pull cluster bezel rearward to disengage 11
clips (Fig. 10).
(4) Remove cluster bezel.
(5) For installation reverse above procedures.
CLUSTER MASK AND LENS REMOVAL
(1) Remove cluster, radio and rear window defog-
ger bezels (Fig. 10). (2) Remove four cluster to panel screws.
(3) Pull cluster assembly rearward. Vehicles with
column shift use care to not damage transmission
range indicator guide tube. (4) Remove four screws holding the cluster mask to
cluster housing (Fig. 11).
(5) Pull cluster mask and lens rearward to remove.
(6) For installation reverse above procedures.
CLUSTER ASSEMBLY
REMOVALÐCLUSTER WITH TRANSMISSION RANGE
INDICATOR FROM STEERING COLUMN
(1) Disconnect battery to assure no air bag system
fault codes are stored. (2) Remove cluster bezel (Fig. 10).
(3) On column shift vehicle: (Fig. 12 through 15).
(a) Remove lower steering column cover (Fig.
16). Release guide tube from behind fuse block.
Fig. 10 Cluster Bezel
Fig. 11 Cluster Mask and Lens
Fig. 12 Transmission Range Indicator Step 1
Fig. 13 Transmission Range Indicator Step 2
Ä INSTRUMENT PANEL AND GAUGES 8E - 5

(b) Place gear shift lever in neutral or park.
(c) Remove guide tube from behind fuse block
and disconnect cable eyelet from column actuating
arm. (d) Release lock bar on column insert, squeeze
legs together and remove from column (Fig. 14). (e) Secure insert and cable guide out of the way.
(4) Remove the rear window defogger bezel and ra-
dio bezel. (5) Remove the upper steering column cover. (6) Remove the four screws attaching cluster hous-
ing to the base panel. (7) Pull cluster rearward, reach behind cluster and
disconnect the two wiring harnesses. (8) Remove cluster assembly.
INSTALLATION (1) Connect wiring harnesses.
(2) Position cluster and secure to base panel with
four screws. (3) On column shift vehicles (Fig. 12 through 15):
Fig. 15 Transmission Range Indicator Step 4
Fig. 16 Instrument Panel Bezels
Fig. 14 Transmission Range Indicator Step 3
8E - 6 INSTRUMENT PANEL AND GAUGES Ä