Dodge Neon / Neon SRT-4. Manual — part 88
CONDITION
POSSIBLE CAUSE
CORRECTION
(3) PINCHED HORN
SWITCH WIRE UNDER
DRIVER AIRBAG MODULE.
(3) REPLACE DRIVER AIRBAG.
(4) HORN SWITCH
INOPERATIVE
(4) REPLACE DRIVER AIRBAG.
HORN SOUND INTERMITTENTLY AS
THE STEERING WHEEL IS TURNED.
(1) HORN RELAY
CONTROL CIRCUIT X3 IS
SHORTED TO GROUND
INSIDE STEERING WHEEL.
(1) REMOVE DRIVER AIRBAG
AND/OR STEERING WHEEL.
CHECK FOR RUBBING OR LOOSE
WIRE/CONNECTOR, REPAIR AS
NECESSARY.
(2) PINCHED HORN
SWITCH WIRE UNDER
DRIVER AIRBAG
(2) REPLACE DRIVER AIRBAG.
(3) HORN SWITCH
INOPERATIVE.
(3) REPLACE DRIVER AIRBAG.
HORN DOES NOT SOUND
(1) CHECK FUSE 18 IN
PDC
(1) REPLACE FUSE IF BLOWN
REPAIR AS NECESSARY.
(2) NO VOLTAGE AT HORN
RELAY TERMINALS 40 &
39, AND FUSE IS OK.
(2) NO VOLTAGE, REPAIR PDC AS
NECESSARY.
(3) OPEN CIRCUIT FROM
TERMINAL 43 OF THE
HORN RELAY TO HORN
SWITCH X3 CIRCUIT.
(3) REPAIR CIRCUIT AS
NECESSARY.
(4) HORN INOPERATIVE.
(4) IF VOLTAGE AT HORN WHEN
HORN SWITCH IS PRESSED,
REPLACE HORN.
(5) HORN SWITCH
INOPERATIVE
(5) REPLACE DRIVER AIRBAG.
FUSE BLOWS WHEN HORN SOUNDS
(1) SHORT CIRCUIT IN
HORN OR HORN WIRING
(1) REMOVE HORN RELAY, CHECK
FOR SHORTED HORN OR HORN
WIRING. DISCONNECT HORN WIRE
HARNESS TO ISOLATE SHORT
AND REPAIR AS NECESSARY.
FUSE BLOWS WITHOUT BLOWING
HORN
(1) SHORT CIRCUIT
(1) REMOVE RELAY, INSTALL NEW
FUSE, IF FUSE DOES NOT BLOW
REPLACE HORN RELAY. IF FUSE
BLOWS WITH RELAY REMOVED,
CHECK FOR SHORT TO GROUND
WITH OHMMETER ON CIRCUIT
BETWEEN TERMINALS 40 & 39
AND THE FUSE TERMINAL. REPAIR
AS NECESSARY.
NOTE: FOR WIRING REPAIRS,
REFER TO WIRE DIAGRAMS.
8H - 2
HORN
PL/SRT-4
HORN SYSTEM (Continued)
HORN
DIAGNOSIS AND TESTING - HORN
(1) Disconnect wire connector at horn.
(2) Using a voltmeter, connect one lead to ground
terminal and the other lead to the positive wire ter-
minal (Fig. 1).
(3) Depress
the
horn
switch,
battery
voltage
should be present.
(4) If no voltage, refer to Horn System Test. If volt-
age is OK, go to Step 5.
(5) Using ohmmeter, test ground wire for continu-
ity to ground.
(6) If no ground repair as necessary.
(7) If wires test OK and horn does not sound,
replace horn.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the right side headlamp (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING
-
EXTERIOR/
HEADLAMP UNIT - REMOVAL).
(3) Disconnect the harness connector.
(4) Remove the one screw holding the horn assem-
bly to vehicle (Fig. 2).
INSTALLATION
(1) Install horn assembly to the vehicle.
(2) Reconnect the harness connector.
(3) Install the headlamp (Refer to 8 - ELECTRI-
CAL/LAMPS/LIGHTING - EXTERIOR/HEADLAMP
UNIT - INSTALLATION).
(4) Connect the battery negative cable.
HORN SWITCH
DESCRIPTION
The horn switch is mounted between the outer and
inner cover of the Driver Airbag.
OPERATION
When the Driver Airbag is pressed, the horn switch
makes contact to ground. The ground signal is car-
ried to the horn relay and the horn sounds.
DIAGNOSIS AND TESTING - HORN SWITCH
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
ELECTRICAL,
RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT
PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Remove horn relay from the Power Distribution
Center.
(2) Using ohmmeter, connect one lead to ground
and the other lead to cavity 41 of the power distribu-
tion center. Refer to Wiring Diagrams.
(3) Depress horn switch, should have continuity. If
no continuity go to Step 4.
(4) Test continuity at horn switch, remove the
Driver Airbag. (Refer to 8 - ELECTRICAL/RE-
STRAINTS/DRIVER AIRBAG - REMOVAL).
(5)
Using ohmmeter, connect one lead to the air-
bag module ground and the other lead to B+ wire.
(6) Depress horn switch, and the meter should
show continuity. If no continuity, replace the Driver
Airbag. If OK, repair as necessary.
Fig. 1 Horn Harness Connector
Fig. 2 HORN MOUNTING
PL/SRT-4
HORN
8H - 3
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
ELECTRICAL,
RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT
PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the Driver Airbag (Refer to 8 - ELEC-
TRICAL/RESTRAINTS/DRIVER
AIRBAG
-
REMOVAL).
(3) Clip off strap tie holding the horn switch wire
to the airbag.
(4) Remove the horn switch wire connector from
airbag.
(5) Remove four torx screws from top side of air-
bag.
(6) Fold airbag module cover down to expose the
horn switch.
(7) Lift the horn switch off indexing tabs and
remove from vehicle.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
ELECTRICAL,
RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT
PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Install horn switch to the indexing tabs on the
airbag.
(2) Install screws to the top of airbag.
(3) Reconnect horn switch connector to airbag.
(4) Install the airbag module (Refer to 8 - ELEC-
TRICAL/RESTRAINTS/DRIVER AIRBAG - INSTAL-
LATION).
(5) Connect the battery negative cable.
8H - 4
HORN
PL/SRT-4
HORN SWITCH (Continued)
IGNITION CONTROL
TABLE OF CONTENTS
page
page
IGNITION CONTROL
FIRING ORDER - 2.0/2.4/2.4 TURBO
. . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . 3
AUTOMATIC SHUT DOWN RELAY
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CAMSHAFT POSITION SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . 6
IGNITION COIL
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . 8
KNOCK SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . 9
REMOVAL - 2.0/2.4/2.4 TURBO/2.4L SRT-4
. . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . 10
INSTALLATION - 2.0/2.4/2.4 TURBO/2.4L
SRT-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . 11
SPARK PLUG
. . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . 12
SPARK PLUG CABLE
. . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . 12
IGNITION CONTROL
DESCRIPTION - IGNITION SYSTEM
NOTE: All engines use a fixed ignition timing sys-
tem. Basic ignition timing is not adjustable. All
spark advance is determined by the Powertrain
Control Module (PCM).
The ignition system used on these engines is
referred to as the Direct Ignition System (DIS). The
system’s three main components are the coils, crank-
shaft position sensor, and camshaft position sensor. If
equipped with the coil on plug ignition system it uti-
lizes an ignition coil for every cylinder, it is mounted
directly over the each spark plug.
OPERATION - IGNITION SYSTEM
The crankshaft position sensor and camshaft posi-
tion sensor are hall effect devices. The camshaft posi-
tion sensor and crankshaft position sensor generate
pulses that are inputs to the PCM. The PCM deter-
mines engine position from these sensors. The PCM
calculates injector sequence and ignition timing from
crankshaft & camshaft position. For a description of
both sensors, refer to Camshaft Position Sensor and
Crankshaft Position Sensor.
PL/SRT-4
IGNITION CONTROL
8I - 1
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