1993 CHEVROLET DYNASTY abs

2.2L TURBO III, 3.3L AND 3.8L IGNITION SYSTEMÐDIAGNOSTIC PROCEDURES INDEX
page page
Check Coil TestÐ3.3L and 3.8L Engines ...... 36
Check Coil TestÐTurbo III Engine ........... 35
Coolant Temperature Sensor Test ............ 38
Crankshaft Position Sensor and Camshaft Position Sensor Tests .......................... 38 Failure to Start Test
...................... 37
Failure to Start TestÐTurbo III Engine ........ 36
Manifold Absolute Pressure (MAP) Sensor Test . 38
Testing for Spark at CoilÐ3.3L and 3.8L Engines . 36
Testing for Spark at CoilÐTurbo III Engine ..... 35
TESTING FOR SPARK AT COILÐTURBO III ENGINE
WARNING: THE DIRECT IGNITION SYSTEM GENER-
ATES APPROXIMATELY 40,000 VOLTS. PERSONAL
INJURY COULD RESULT FROM CONTACT WITH
THIS SYSTEM.
The coil pack contains 2 independent coils. Each
coil must be checked individually.
CAUTION: Spark plug wire damage may occur if the
spark plug is moved more than 1/4 inch away from
the engine ground.
Remove the cable from number 1 spark plug. Insert
a clean spark plug into the spark plug boot, and
ground plug to the engine (Fig. 1).
CAUTION: Spark plug wire damage may occur if the
spark plug is moved more than 1/4 inch away from
the engine ground. Crank the engine and look for spark across the
electrodes of the spark plug. Repeat the above test
for the remaining cylinders. If there is no spark dur-
ing the cylinder tests, proceed to the failure to start
test. If one or more cylinders have irregular, weak, or
no spark, proceed to Check Coil Test.
CHECK COIL TESTÐTURBO III ENGINE
Cylinder s1&4,and2&3are grouped together.
(1) Remove the ignition cables and measure the
resistance of the cables. Resistance must be between
3,000 to 12,000 ohms per foot of cable. Replace any
cable not within tolerance. (2) Disconnect the electrical connector from the coil
pack (Fig. 2).
(3) Measure the primary resistance of each coil. At
the coil, connect an ohmmeter between the B+ pin and
the pin corresponding to the cylinders in question (Fig.
3). Resistance on the primary side of each coil should be
0.5-0.7 ohm. Replace the coil if resistance is not within
tolerance.
(4) Remove ignition cables from the secondary tow-
ers of the coil. Measure the secondary resistance of the
coil between the towers of each individual coil
Fig. 1 Testing For Spark
Fig. 2 Ignition Coil Electrical ConnectionÐTurbo III Engine
Fig. 3 Ignition Coil Terminal Identification
Ä IGNITION SYSTEMS 8D - 35

Refer to the appropriate Powertrain Diagnostics Pro-
cedure Manual. Refer to the wiring diagrams section
for circuit information.
COOLANT TEMPERATURE SENSOR TEST
(1) With key off, disconnect wire connector from
coolant temperature sensor (Fig. 9).
(2) Connect one lead of ohmmeter to one terminal of
coolant temperature sensor. (3) Connect the other lead of ohmmeter to remaining
terminal of coolant temperature sensor. The ohmmeter
should read as follows;
² Engine/Sensor hot at normal operating temperature
around 200ÉF should read approximately 700 to 1,000
ohms.
² Engine/Sensor at room temperature around 70ÉF,
ohmmeter should read approximately 7,000 to 13,000
ohms. To test the coolant temperature sensor circuits,
refer to the DRBII scan tool and the appropriate
Powertrain Diagnostic Service manual.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
TEST
Refer to the appropriate Powertrain Diagnostic Pro-
cedure manual.
CRANKSHAFT POSITION SENSOR AND CAMSHAFT
POSITION SENSOR TESTS
Refer to the appropriate Powertrain Diagnostic Pro-
cedure manual.
Fig. 9 Coolant Temperature Sensor Test
8D - 38 IGNITION SYSTEMS Ä

2.2L TURBO III, 3.3L AND 3.8L IGNITION SYSTEMSÐSERVICE PROCEDURES INDEX
page page
Camshaft Position Sensor ServiceÐTurbo III Engine.42Camshaft Position SensorÐ3.3L and 3.8L Engines.43
Coolant Temperature SensorÐ3.3L and 3.8L Engines .............................. 39
Coolant Temperature SensorÐTurbo III ........ 39
Crankshaft Position SensorÐ3.3L and 3.8L Engines.42
Crankshaft Position SensorÐTurbo III Engine . . . 42
Idle RPM Test ........................... 41
Ignition Coil ServiceÐTurbo III Engine ........ 43 Ignition CoilÐ3.3L and 3.8L Engine
........... 43
Knock SensorÐTurbo III Engines ............ 40
Manifold Absolute Pressure (MAP) SensorÐ3.3L and 3.8L Engines ....................... 44
Manifold Absolute Pressure (MAP) SensorÐ Turbo III Engine ........................ 44
Powertrain Control Module (PCM) ............ 39
Spark Plug Cable Service .................. 40
Spark Plug Service ....................... 41
POWERTRAIN CONTROL MODULE (PCM)
REMOVAL
(1) Remove air cleaner duct or air cleaner assem-
bly. (2) Remove battery.
(3) Remove powertrain control module (PCM)
mounting screws (Fig. 1). (4) Remove 60-way connector from PCM. Remove
PCM.
INSTALLATION
(1) Connect 60-Way connector to PCM (Fig. 1).
(2) Install PCM on inside left front fender. Install
and tighten mounting screws. (3) Install the battery.
(4) Install air cleaner duct or air cleaner assembly.
COOLANT TEMPERATURE SENSORÐTURBO III
The coolant sensor threads into the thermostat
housing (Fig. 2).
REMOVAL
(1) Drain cooling system until coolant level is be-
low thermostat housing. Refer to Group 7, Cooling
System. (2) Remove air cleaner fresh air duct.
(3) Disconnect electrical connector from coolant
sensor. (4) Remove sensor from thermostat housing (Fig.
2).
INSTALLATION
(1) Install sensor. Tighten to 7 N Im (60 in. lbs.)
torque. (2) Connect electrical connector to coolant sensor
(3) Fill cooling system. Refer to Group 7, Cooling
System. (4) Install fresh air duct.
COOLANT TEMPERATURE SENSORÐ3.3L AND
3.8L ENGINES
The coolant temperature sensor is located below
the ignition coil (Fig. 3).
REMOVAL
(1) Drain cooling system until coolant level is be-
low coolant sensor. Refer to Group 7, Cooling System. (2) Remove electrical connector from coil (Fig. 4).
(3) Remove coil mounting screws.
(4) Rotate coil away from coolant temperature sen-
sor.
Fig. 1 Powertrain Control Module (PCM)
Fig. 2 Coolant Temperature SensorÐTurbo III
Ä IGNITION SYSTEMS 8D - 39

Reverse the above procedure for installation.
Tighten mounting screws to 12 N Im (105 in. lbs.)
torque.
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSORÐTURBO III ENGINE
The map sensor mounts to the right front fender
(Fig. 16). (1) Remove vacuum hose from MAP sensor.
(2) Remove MAP sensor mounting screws.
(3) Remove electrical connector from sensor.
(4) Reverse procedure for installation.
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSORÐ3.3L AND 3.8L ENGINES
The alignment of the MAP sensor is critical to the
sensors performance. The top of the sensor is marked
This Side Up (Fig. 17). (1) Disconnect electrical connector from MAP sen-
sor. (2) Remove sensor by unscrewing from the intake
manifold (Fig. 17). (3) Reverse the above procedure for installation.
Fig. 14 Ignition Coil ServiceÐ2.2L Turbo III
Fig. 15 Ignition Coil Removal and Installation
Fig. 16 MAP SensorÐTurbo III Engine
Fig. 17 Manifold Absolute Pressure Sensor
8D - 44 IGNITION SYSTEMS Ä

(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

(a) Route transmission range indicator guide as-
sembly under left steering column wing and down
left side of column (Fig. 12). (b) Insert flange of column insert into column,
squeeze legs together with tabs under column
jacket and engage lock bar to secure insert (Fig.
14). (c) Hook cable eyelet to steering column actuator
check pointer, should indicate neutral. Do not kink
or bind transmission range indicator guide tube
and position guide tube in original location. (d) Adjust with tool if necessary to center pointer
on N (Neutral) and check in other gears (Fig. 15).
(4) Install upper and lower steering column cover.
(5) Install the rear window defogger bezel and ra-
dio bezel. (6) Install cluster bezel.
(7) Reconnect battery.
REMOVALÐCLUSTER WITHOUT TRANSMISSION RANGE
INDICATOR FROM STEERING COLUMN (1) Remove cluster bezel (Fig. 10).
(2) Remove four screws attaching cluster to base
panel. (3) Pull cluster rearward carefully, reach behind
and disconnect the two harness connectors. (4) Carefully rotate cluster and remove the two
transmission range indicator screws. (5) Remove cluster assembly.
(6) For installation reverse above procedures. (a) Do not kink guide tube when installing clus-
ter. (b) Replace guide tube behind fuse block.
GAUGES
It is not necessary to remove instrument clus-
ter assembly from vehicle for gauge replace-
ment. When removing gauge assemblies from cluster,
gauge must be pulled straight out, not twisted, or
damage to gauge pin may result.
MULTIPLE GAUGE MALFUNCTION
If the fuel, voltage and tachometer gauges appear
to be malfunctioning, remove the cluster assembly.
Check for good pin contact between the wire harness
and printed circuit board. If there is good contact,
check for ignition voltage at ignition cavity C of the
black connector. If there is ignition voltage, check for
continuity between the wire harness ground cavity H
of the black connector and ground. If there is conti-
nuity, replace printed circuit board. If the temperature, oil pressure and speedometer
gauges appear to be malfunctioning remove the clus-
ter assembly. Check for a good contact between the
wire harness and the printed circuit board. If there is
good contact, check for ignition voltage at cavity J of
the red connector. If there is voltage, check for con- tinuity at cavity H of the black connector. If there is
continuity, replace the printed circuit board.
If the temperature, fuel, voltage and speedometer
gauges appear to be malfunctioning, remove the clus-
ter assembly. Check for good pin contact between the
wire harness and the printed circuit board. If there is
good contact, check ignition voltage at cavity J of the
red connector. If there is voltage, check for continuity
at cavity H of the black connector. If there is conti-
nuity, replace the printed circuit board.
GAUGE INOPERATIVE (FIG. 17 THROUGH 23)
(1) Remove gauge in question.
Fig. 17 Fuel Gauge PinsÐWith Tachometer
Fig. 18 Fuel Gauge PinsÐWithout Tachometer
Ä INSTRUMENT PANEL AND GAUGES 8E - 7

CONDITION: SPEEDOMETER AND ODOMETER ARE INOPERATIVE OR OPERATESINTERMITTENTLY
PROCEDURE
Check for defective vehicle speed sensor wiring.
CONDITION: OIL GAUGE, FUEL GAUGE, TEMPERATURE GAUGE, OR VOLTAGE GAUGEINOPERATIVE
PROCEDURE
Check for defective sending unit or wiring: (a) Sending units and wiring can be checked by
grounding the connector leads, at the sending unit,
in the vehicle. (b) With the ignition in the ON position, a
grounded input will cause the oil, fuel, or temper-
ature gauge to read maximum.
CONDITION: CLUSTER DISPLAY DOES NOT DIM WHEN HEADLAMP SWITCH ISACTIVATED AND RHEOSTAT ROTATED
PROCEDURE
(1) Check fuses in headlamp circuit.
(2) Check for loose connections or defective wiring
from headlamp switch to the cluster. (3) Check for defective headlamp switch.
(4) The electronic instrument cluster requires both
a marker feed and illumination feed to operate cor-
rectly.
SWITCH AND PANEL COMPONENT SERVICE
HEADLAMP/FOG LAMP SWITCH REPLACEMENT
(1) Remove cluster bezel (Fig. 40).
(2) Remove three screws securing headlamp switch
mounting plate to base panel (Fig. 41). (3) Pull headlamp/fog lamp switch mounting plate
rearward. Disconnect wiring connectors from head-
lamp switch and fog lamp switch pigtail (Fig. 42). (4) Remove knob and stem by depressing button on
bottom of the switch (Fig. 43). (5) Snap-out escutcheon.
(6) Remove fog lamp switch from escutcheon.
(7) Remove nut that attaches headlamp switch to
mounting plate (Fig. 44). (8) For installation reverse above procedures.
FOG LAMP SWITCH TEST
(1) Remove the fog lamp switch from mounting lo-
cation. (2) Disconnect the wiring harness from the switch
pigtail. (3) Using a Ohmmeter, test for continuity between
the terminals of the switch pigtail (Fig. 45). (4) If not OK, replace switch.
LOWER STEERING COLUMN COVERREPLACEMENT
(1) Disconnect park brake release rod from park
brake. (2) Remove fuse box access door and remove screw
from lower column cover (Fig. 46). (3) Remove screws from lower cover, four across
the top and two on bottom. (4) Remove lower steering column cover.
(5) For installation reverse above procedures.
LEFT LOWER INSTRUMENT PANEL SILENCER REPLACEMENT
(1) Remove screws from front of silencer (Fig. 47).
(2) Remove push nut.
(3) Remove silencer.
(4) For installation reverse above procedures.
RIGHT LOWER INSTRUMENT PANEL SILENCER REPLACEMENT
(1) On floor shift vehicles, remove console assem-
bly and center brace bracket. (2) On column shift vehicles, remove center brace
bracket. (3) Remove screws from front of silencer (Fig. 47).
(4) Remove three push nuts from rear of silencer.
(5) Remove lower right silencer.
(6) For installation reverse above procedures.
GLOVE BOX ASSEMBLY REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Open glove box door and disconnect check
strap. (3) Remove glove box light and switch by squeez-
ing retaining tabs from behind switch mount and
slide rearward. Disconnect wiring connectors. (4) Remove 11 screws from glove box assembly
(Fig. 48). (5) Remove glove box assembly.
Fig. 36 Electronic Cluster
Ä INSTRUMENT PANEL AND GAUGES 8E - 15

(6) For installation reverse above procedures and
check operation of glove box door and adjust latch as
necessary.
GLOVE BOX LAMP AND SWITCH REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Open glove box door. The lamp can be removed
without removing switch (3) Remove switch by squeezing retaining tabs
from behind switch mount and slide rearward. Dis-
connect wiring connectors. (4) Remove lamp and switch.
(5) For installation reverse above procedures.FOG LAMP RELAY REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground.
ART: 938e-92 ; SIZE (6) = 4-1/2h x 7-1/4w
Fig. 39 Cluster Connectors
Fig. 40 Cluster BezelFig. 41 Headlamp Switch Mounting Screws
8E - 18 INSTRUMENT PANEL AND GAUGES Ä