ignition CHEVROLET DYNASTY 1993 Service Manual

(1) Look for rough areas or flash in the casting and
if found remove with a file (Fig. 3). (2) Remove the link and slider.
(3) Check the link to see if it has been bent and if
so replace with a new part. Put the slider in its slot in the sleeve and verify a
loose fit over the length of the slot. If the slider binds
in the slot at any point lightly file the slider until
clearance is achieved.
² If no binding is found.
Lightly file the ramp on the ignition switch, (The
ramp fits into the casting) until binding no longer oc-
curs.
Fig. 3 Steering Column Flash Removal And Non- Serviceable Components
Ä STEERING 19 - 35

AUTOMATIC TRANSMISSION SHIFTER/IGNITION INTERLOCK INDEX
page page
General Information ....................... 36
Interlock System Adjustment ................ 37 Interlock System Operation Check
............ 36
Shifter/Ignition Interlock Cable ............... 38
GENERAL INFORMATION
The automatic transmission Shifter/Ignition Inter-
lock, is a mechanically cable operated system (Fig.
1). It interconnects the automatic transmission floor
mounted shifter to the steering column ignition
switch. The interlock system locks the floor mounted
shifter on automatic transmission equipped vehicles
into the PARK position. The Interlock system is en-
gaged whenever the ignition switch is in the LOCK
or ACCESSORY position. When the key is in the
OFF or RUN position the shifter is unlocked and will
move into any position. The interlock system also
prevents ignition switch from being turned to the
OFF or ACCESSORY position, unless shifter is fully
locked into the PARK position.
INTERLOCK SYSTEM OPERATION CHECK
(1) With the shifter in PARK, and the shifter knob
pushbutton in its full up position, the ignition switch should rotate freely from OFF to LOCK position.
When the shifter is moved to the DRIVE (or OVER-
DRIVE) position if so equipped the ignition switch
should not rotate from OFF to LOCK. (2) Moving shifter out of PARK should only be pos-
sible when ignition switch is in the OFF or RUN po-
sition. Movement of the shifter from the PARK
position should not be possible, when the ignition
switch is in the LOCK position. (3) If the automatic transmission Shifter/Ignition
Interlock System operates in any way other than as
described above, diagnosis, adjustment or repair of
the system is required. See Adjustment and Repair
procedures in this section of the service manual.
Fig. 1 Shifter Ignition Interlock System Components
19 - 36 STEERING Ä

INTERLOCK SYSTEM ADJUSTMENT
If ignition switch is binding, operating effort high or
can not be turned to the LOCK position, with shifter locked
in PARK, adjustment of Interlock System may be
required. To adjust Interlock System, follow procedure
listed below. (1) Remove the shift knob to shifter retaining screw
and shift knob from shifter (Fig. 2). Leave the shifter
release button in shifter handle.
(2) On the AA and AP bodies, remove PRNDL plate
(Fig. 2) from center console for adjustment of interlock
cable. PRNDL plate is removed by gently prying be-
tween plate and console with a screw driver. Use care
so not to damage plate or console assembly. (3) On the AG and AJ bodies, the center console
(Fig. 3) requires removal from vehicle for adjustment of
interlock cable. Refer to the AG or AJ section of Group
23 Body, in this service manual for detailed center
console removal procedure. (4) Place shifter in PARK, and ensure that the
plunger (Fig. 4) on shifter mechanism is in the full up
position. (5) Turn ignition switch to the ACCESSORY posi-
tion. The Interlock System will not adjust prop-
erly if the ignition switch is in the LOCK position.
If interlock cable has lost its adjustment, it
will be necessary to manually position cable to get
key into Accessory position. Grasp slug on interlock
cable (Fig. 5) with needle nose pliers and pull back
on cable. This will allow the ignition switch to be
turned to the ACCESSORY position. (5) Check that the interlock cable slug is com-
pletely seated into the shifter interlock lever (Fig. 4). (6) Check that the ignition switch is still in the ac-
cessory position (Fig. 1). Loosen the shifter interlock
Fig. 3 AG & AJ Center Console
Fig. 4 Plunger Position For Interlock Adjustment
Fig. 2 Removing Shift Knob And PRNDL Plate
Ä STEERING 19 - 37

lever adjustment nut, (Fig. 6) enough to allow the
spring to correctly position the interlock lever on the
shifter assembly.
(7) Then torque the interlock lever adjustment nut
to2N Im (15 in. lbs.) minimum 3 N Im (25 in. lbs.)
maximum. (8) On the AA and AP bodies, install the PRNDL
plate (Fig. 2) back into the center console. (9) On the AG and AJ bodies, install the center
console (Fig. 3) back into the vehicle. Refer to the
AG or AJ section of Group 23 Body, in this service
manual for detailed center console installation proce-
dure. (10) Install the shift knob onto the shifter assem-
bly. Install the shift knob to shifter retaining screw
and torque to 3 N Im (25 in.lbs. ) (Fig. 2). (11) After adjusting the interlock system, perform
the interlock system operation check. See Interlock
System Operation Check in this section of the service
manual.
SHIFTER/IGNITION INTERLOCK CABLE
REMOVE
(1) Disconnect and isolate, the battery negative (-)
cable from the vehicle battery. (2) Remove the lower dash panel bolster and inside
hood release lever, (Fig. 5) from the vehicle instru-
ment panel.
(3) Remove the tilt lever (Fig. 6) (if so equipped)
from the steering column assembly. (4) Remove the 3 screws mounting upper steering
column shrouds to steering column assembly and
then remove the shrouds (Fig. 6). (5) Remove the 2 nuts holding the upper steering
column mounting bracket, to the steering column
support bracket (Fig. 7). Lower steering column for
clearance when removing lower shrouds from steer-
ing column. (6) Remove the 3 screws mounting the lower steer-
ing column shroud to the steering column assembly
and remove shroud (Fig. 8). (7) Remove shift knob to shifter retaining screw
and remove knob from shifter assembly. Remove
PRNDL plate from the console assembly (Fig. 9). (8) Remove center console assembly. Refer to
Group 23 Body, in this service manual for the appro-
priate procedure for body style being serviced.
Fig. 5 Interlock Cable Slug
Fig. 6 Adjusting Interlock Lever
Fig. 5 Remove Hood Release lever And Dash Panel Bolster
19 - 38 STEERING Ä

INSTALL
CAUTION: When installing interlock cable assem-
bly, care must be taken not to bend exposed cable
wire and slug at shifter end of cable.
(1) Route interlock cable into lower dash panel and
down under the center console mounting bracket
(Fig. 1). Cable must be routed above the lower dash
panel support bracket and above throttle pedal base. (2) Turn the ignition switch to the RUN position
(Fig. 1). Install the interlock mechanism on the
steering column, by locking tabs on back of mecha-
nism into large square opening on steering column. (3) Move cam on interlock mechanism by hand, al-
lowing slider to move into cam and ignition switch to
rotate to the ACCESSORY position. Then turn the
ignition switch to the ACCESSORY position (Fig. 1). (4) Install the 2 interlock mechanism to steering
column attaching screws (Fig. 13) and torque to 3
N Im (21 in. lbs.).
(5) Install interlock cable into routing clip on
lower steering column mounting bracket.
Fig. 10 Interlock Adjusting Nut
Fig. 11 Interlock Cable Removal
Fig. 12 Remove Interlock Routing Clip
Fig. 13 Removing Interlock Mechanism
19 - 40 STEERING Ä

CAUTION: Interlock cable must by completely
clipped to the throttle pedal bracket with both barbs
of clip fully installed through mounting holes. This
is to prevent interference with throttle pedal.
(6) Snap the interlock cable routing clip into the 2
holes on the throttle pedal mounting bracket (Fig.
12). (7) Snap the end fitting of the interlock cable into
the corner of the shifter assembly (Fig. 14). The cable
end and clip must pass under and clip to the shifter
pivot.
(8) Install slug on end of interlock cable into notch,
on shifter lockout spring loaded lever (Fig. 15). Make
sure that cable slug is fully seated in cup of lever as-
sembly. (9) Adjust the Shifter/Ignition Interlock System.
See Interlock System Adjustment, in this section of
service manual. (10) Perform the Shifter/Ignition Interlock System
operation check, as described in the beginning of this
section. (11) Install center console assembly. Refer to
Group 23 Body, in this service manual for the appro-
priate procedure for the body style being serviced.
(12) Install PRNDL plate in center console. Install
the shift knob onto the shifter assembly. Install the
shift knob to shifter retaining screw and torque to 3
N Im (25 in.lbs.) (Fig. 2). (13) Install the lower steering column shrouds on
the steering column (Fig. 8). Tighten the 2 lower
shroud to steering column screws. (14) Make sure ground clip is on left breakaway
capsule. Make sure that both breakaway capsules are
fully seated in the upper steering column bracket. In-
stall the upper steering column mounting bracket
onto the steering column support bracket (Fig. 7). In-
stall the 2 upper steering column bracket to support
bracket nuts and torque to 12 N Im (105 in. lbs.).
(15) Install the upper steering column shrouds on
the steering column (Fig. 6). Tighten the 3 upper
shroud to steering column attaching screws. (16) Install the tilt lever (Fig. 6) (if so equipped)
back on the steering column assembly. (17) Install the lower dash panel bolster. Install
bolster attaching screws and torque to 3 N Im (24 in.
lbs.). Install the inside hood release lever and torque
screws to 3 N Im (24 in. lbs.) (Fig. 5).
(18) Reconnect the battery negative (-) cable to the
vehicle battery.
Fig. 14 Interlock Cable Installation
Fig. 15 Install Interlock Cable In Shifter
Ä STEERING 19 - 41

(11) Remove front engine mount insulator and
bracket (Fig. 5). (12) On vehicles equipped with D.I.S. ignition sys-
tem, remove crankshaft position sensor from bell
housing. For installation procedure refer to section
8D of this service manual.
CAUTION: Failure to remove the crankshaft position
sensor from the bell housing could damage the
sensor or torque converter drive plate during trans-
mission removal or installation.
(13) Remove starter bolts and set starter aside. Do
not allow the starter to hang from battery cable (Fig.
6). (14) Position transmission jack securely under
transaxle (Fig. 7). (15) With transmission jack in position, remove
the left transmission mount (Fig. 8). (17) Carefully lower the transaxle assembly from
vehicle (Fig. 9). When installing transaxle, reverse the above proce-
dure.
Fig. 2 Remove Left Splash Shield
Fig. 3 Remove Torque Converter Dust Shield
Fig. 4 Disconnect transmission range switch and Park/Neutral Position Switch
Fig. 5 Remove Front Engine Mount
21 - 100 TRANSAXLE Ä

WARNING: AVOID RADIATOR/CONDENSER FAN
BLADES WHEN WORKING IN THE RADIATOR
AREA. FAN IS CONTROLLED BY TEMPERATURE
AND CAN START ANY TIME IGNITION IS ON. PER-
SONAL INJURY CAN RESULT.
(1) Disconnect fan control switch wire connector.
(2) Using a suitable jumper wire, jump across ter-
minals in wire connector. (3) Connect a suitable continuity tester across fan
control switch terminals. (4) Start engine and set idle at 1300 rpm. The ra-
diator fan should run constantly. (5) Set the A/C controls to A/C and high blower.
(6) If the high pressure gauge reads below 1102
kPa (160 psi) there should be no continuity across
the switch terminals.
CAUTION: Do not allow engine to overheat when ra-
diator air flow is blocked.
(7) Block radiator air flow with a suitable cover to
increase the high side pressure to at least 1585 kPa
(230 psi). Electrical continuity should be detected
across the fan control switch terminals. (8) Remove cover from front of vehicle to allow
high side pressure to decrease. When pressure drops
below 1102 kPa (160 psi), continuity should cease. If fan control switch is defective, replace it.
REMOVAL AND INSTALLATION
CAUTION: Refrigerant removal is not necessary
when removing the Condenser Fan Control Switch.
However, a small amount of refrigerant will vent
from the switch port. Review the refrigerant han-
dling section of Safety Precautions and Warnings in
the General Information section of this Group.
(1) Disconnect wire connector from condenser fan
control switch. (2) Loosen and quickly rotate the switch counter-
clockwise and separate from the high pressure line
switch port. To install, reverse the preceding operation.
DIFFERENTIAL PRESSURE CUT-OUT SWITCH
DIAGNOSIS
The Differential Pressure Cut-Out (DPCO) Switch
(Fig. 3) monitors the liquid refrigerant pressure on
the liquid side of the system. The DPCO is located on
the expansion valve. The expansion valve is black in
color when a variable displacement compressor is
used. The DPCO turns off voltage to the compressor
clutch coil when liquid refrigerant pressure drops to
levels that could damage the compressor. The DPCO
is a sealed factory calibrated unit. It must be re-
placed if defective.
DPCO SWITCH DIAGNOSIS
The work area must not be below 10ÉC (50ÉF) to
test the compressor clutch circuit. (1) With gear selector in park or neutral, and park
brake set, start engine and allow to idle. (2) Raise hood and disconnect DPCO switch con-
nector boot. (3) Using a suitable jumper wire, jump across the
terminals inside wire connector boot. (4) If clutch does not engage, the wiring, fuse, re-
lay, ambient switch, or high pressure cut-off switch
can be defective. Refer to Group 8W, Wiring Dia-
grams. (5) If clutch engages, connect a suitable manifold
gauge set. Read low pressure gauge. At pressure 283
kPa (41 psi) and above, DPCO switch will complete
the clutch circuit. If the low pressure gauge reads be-
low 317 kPa (46 psi), the system is low on refrigerant
charge or empty due to a leak. Refer to Testing For
Refrigerant Leaks in the Refrigerant Service Proce-
dures section. (6) Install connector boot on switch and repeat step
number 3. If the clutch does not engage, replace the
DPCO switch.
TEMPERATURE CONTROL CABLEÐAC/AY MODELS
REMOVAL AND INSTALLATION
A Temperature Control Cable is used on non-ATC
heat or heater-A/C systems only. ATC (Automatic
Temperature Control) systems use an electrically op-
erated temperature control. Refer to the ATC section
of this Group. (1) Remove the A/C-Heater control panel assembly.
Refer to A/C-Heater Control Replacement in Group
8E Instrument Panel. Disconnect the cable attaching
flag from the A/C-heater control and remove the ca-
ble from control panel.
Fig. 3 Differential Pressure Cut-Out Switch
24 - 48 HEATING AND AIR CONDITIONING Ä

(4) Unplug sensor from receptacle.
To install, reverse the preceding operation and
retest system.
FRESH/RECIRC DOOR ACTUATOR
The fresh/recirc door actuator is an electric servo
motor. It (with the use of linkage) mechanically po-
sitions the A/C unit door in the open or closed posi-
tion. Actuation of the servo motor will occur when
drive signals are supplied to the actuator from the
computer control. This actuator does not contain a
feedback strip therefore can not communicate the
fresh/recirc door position back to the computer con-
trol. The fresh/recirc door actuator is not serviceable
and must be replaced if found to be defective. The Fresh/Recirc Door Actuator is located on the
passenger side of the A/C-heater case.
CAUTION: Do not remove any of the motor actua-
tors from the heater-A/C unit assembly with any
electrical power applied. Removal should only be
done with the Ignition OFF. The actuators have no
mechanical stops to limit their travel. If the actuator
rotates and is not connected to the unit assembly,
it will become un-calibrated.
REMOVAL AND INSTALLATION
(1) Remove the glove box/ash tray assembly. Refer
to the Switch and Panel Component Service section
of Group 8E. (2) Remove under panel silencer pad.
(3) Remove the carpeted cover over the air bag
module. (4) Remove the right front kick panel.
(5) Remove metal instrument panel brace (Fig. 7).
(6) Remove two screws mounting the actuator
mounting bracket to the A/C-heater case (Fig. 8). (7) Remove three screws holding the actuator to
the mounting bracket (Fig. 9). CAUTION: Do not allow screw A (Fig. 8) to drop into
A/C-heater housing assembly.
(8) Tilt actuator to release from actuator link. Re-
move actuator from vehicle.
Fig. 9 Actuator Removal and Installation
Fig. 6 Ambient Sensor Removal and InstallationFig. 7 Brace Removal and Installation
Fig. 8 Actuator Mounting Bracket Removal and Installation
24 - 68 HEATING AND AIR CONDITIONING Ä

To install, reverse the preceding operation.
BLEND-AIR DOOR ACTUATOR
The blend-air door actuator (Fig. 10) is an electric
servo motor which mechanically positions the A/C
unit temperature door. Actuation of the servo motor
will occur when drive signals are supplied to the ac-
tuator from the computer control. A feedback strip in
the actuator allows the computer control to know the
exact position of the temperature door at all times.
The blend-air door actuator is not serviceable and
must be replaced if found to be defective.
CAUTION: Do not remove any of the motor actua-
tors from the heater-A/C unit assembly with any
electrical power applied. Removal should only be
done with the Ignition OFF. The actuators have no
mechanical stops to limit their travel. If the actuator
rotates and is not connected to the unit assembly,
it will become un-calibrated.
REMOVAL AND INSTALLATION
The blend-air door actuator is located on the A/C-
heater housing above the floor hump. (1) Remove under panel silencers.
(2) Remove the carpeted cover over the air bag
control module. (3) Remove floor air distribution duct.
(4) Locate and remove three actuator attaching
screws. (5) Lower the blend-air door actuator from A/C-
heater housing while removing actuator from blend-
air door shaft (Fig. 11). (6) Disengage wire connector lock and unplug con-
nector. To install, reverse the preceding operation.
CAUTION: Align the blend-air door shaft to the slot
in the actuator. Be sure the shaft on blend-air door
actuator is properly engaged (when installing) to
prevent damage.
Perform system check.
MODE DOOR ACTUATOR
The mode door actuator is an electric servo motor.
It (with the use of linkages) mechanically positions
the A/C unit panel/bi-level door and the floor/defrost
door. Actuation of the servo motor will occur when
drive signals are supplied to the actuator from the
computer control. This actuator also contains a feed-
back strip which allows the computer control to know
the exact position of the mode door at all times. The
mode door actuator is not serviceable and must be re-
placed if found to be defective. The Mode Door Actuator is located on the side of
the A/C-heater case near the accelerator pedal.
CAUTION: Do not remove any of the motor actua-
tors from the heater-A/C unit assembly with any
electrical power applied. Removal should only be
done with the Ignition OFF. The actuators have no
mechanical stops to limit their travel. If the actuator
rotates and is not connected to the unit assembly,
it will become un-calibrated.
REMOVAL AND INSTALLATION
(1) Remove under panel silencer.
(2) Disconnect electrical connector from actuator.
(3) Pinch and remove the lower plastic clip from
the actuator arm (Fig. 12).
Fig. 10 Blend-Air Door ActuatorÐMode Door ActuatorÐView from bottom of A/C Housing
Figs. 11 Blend-Air Door Actuator Removal andInstallationÐView from bottom of A/C Housing
Ä HEATING AND AIR CONDITIONING 24 - 69