Dodge Neon / Neon SRT-4. Manual — part 90
(4) Loosen screw attaching target magnet to rear
of camshaft (Fig. 10).
INSTALLATION
INSTALLATION - 1.6L
(1) Install sensor to cylinder head (Fig. 8).
(2) Tighten screws to 9 N·m (80 in. lbs.).
(3) Connect the electrical connector to the sensor
(Fig. 7).
(4) Relocate and install the 2 bolts to the power-
steering reservoir.
(5) Relocate the fuel line and radiator over flow
hose (Fig. 6).
(6) Connect the negative battery cable
INSTALLATION - 2.0L
The camshaft position sensor is mounted to the
rear of the cylinder head (Fig. 9).
The target magnet has two locating dowels that fit
into machined locating holes in end of the camshaft.
(1) Install target magnet in end of camshaft.
Tighten mounting screw to 3.4 N·m (30 in. lbs.)
torque. Over torquing could cause cracks in magnet.
If magnet cracks replace it.
(2) Install camshaft position sensor. Tighten sensor
mounting screws to 9 N·m (80 in. lbs.) torque.
(3) Place brake booster hose and electrical harness
in holders on end of valve cover.
(4) Attach electrical connectors to camshaft posi-
tion sensor.
IGNITION COIL
DESCRIPTION
The coil pack consists of 2 coils molded together.
The coil pack is mounted on the valve cover (Fig. 11).
OPERATION
WARNING: THE DIRECT IGNITION SYSTEM GENER-
ATES APPROXIMATELY 40,000 VOLTS. PERSONAL
INJURY COULD RESULT FROM CONTACT WITH
THIS SYSTEM.
High tension leads route to each cylinder from the
coil. The coil fires two spark plugs every power
stroke. One plug is the cylinder under compression,
the other cylinder fires on the exhaust stroke. Coil
Fig. 9 Camshaft Position Sensor Location
Fig. 10 Target Magnet Removal/Installation
1 - TARGET MAGNET
2 - MOUNTING BOLT
3 - REAR OF CYLINDER HEAD
Fig. 11 Ignition Coil Pack
1 - RUBBER INSULATORS
2 - COIL
8I - 6
IGNITION CONTROL
PL/SRT-4
CAMSHAFT POSITION SENSOR (Continued)
number one fires cylinders 1 and 4. Coil number two
fires cylinders 2 and 3. The PCM determines which
of the coils to charge and fire at the correct time.
The Auto Shutdown (ASD) relay provides battery
voltage to the ignition coil. The PCM provides a
ground contact (circuit) for energizing the coil. When
the PCM breaks the contact, the energy in the coil
primary transfers to the secondary causing the
spark. The PCM will de-energize the ASD relay if it
does not receive the crankshaft position sensor and
camshaft position sensor inputs. Refer to Auto Shut-
down (ASD) Relay—PCM Output, in this section for
relay operation.
REMOVAL
REMOVAL - 1.6L
NOTE: The 1.6L is attached with a rubber isolator
system. Care must be exercised in retaining all the
pieces and reinstalling in the order they where
removed.
The electronic ignition coil pack attaches directly
to the valve cover (Fig. 12).
(1) Disconnect the negative battery cable.
(2) Remove the 4 spark plug cables, twist the
cables to remove.
(3) Remove the 4 bolts.
(4) Remove the coil.
(5) Remove the rubber insulators from the valve
cover, they will be required for installation.
REMOVAL - 2.0L
The electronic ignition coil pack attaches directly
to the valve cover (Fig. 14).
(1) Disconnect electrical connector from coil pack
(Fig. 13).
(2) Remove coil pack mounting bolts.
(3) Remove coil pack.
Fig. 12 IGNITION COIL
1 - RUBBER INSULATORS
2 - COIL
Fig. 13 Electronic Ignition Coil Connector
1 - COIL
2 - LOCKING TAB
Fig. 14 Electronic Ignition Coil Pack
1 - IGNITION COILS
2 - SPARK PLUG CABLE
3 - SPARK PLUG INSULATOR
PL/SRT-4
IGNITION CONTROL
8I - 7
IGNITION COIL (Continued)
INSTALLATION
INSTALLATION - 1.6L
Make sure that the rubber insulators are in place
both on the top and bottom of the coil bolts.
(1) Install coil and insulators (Fig. 15).
(2) Tighten bolts to 12 N·m (105 ±20 in. lbs.).
(3) Install spark plug cables.
(4) Connect the negative battery cable.
INSTALLATION - 2.0L
The electronic ignition coil pack attaches directly
to the valve cover (Fig. 14).
(1) Install coil pack on valve cover. Tighten the
bolts to 11.8 N·m (105 ±20 in. lbs.).
(2) Transfer spark plug cables to new coil pack.
The coil pack towers are numbered with the cylinder
identification. Be sure the ignition cables snap onto
the towers.
(3) Connect the negative battery cable.
KNOCK SENSOR
DESCRIPTION
The knock sensor is bolted to the cylinder block.
The knock sensor is designed to detect engine vibra-
tion that is caused by detonation or preignition.
OPERATION
When the knock sensor detects a knock in one of
the cylinders, it sends an input signal to the PCM. In
response, the PCM retards ignition timing for all cyl-
inders by a scheduled amount.
Knock sensors contain a piezoelectric material
which constantly vibrates and sends an input voltage
(signal) to the PCM while the engine operates. As the
intensity of the crystal’s vibration increases, the
knock sensor output voltage also increases.
The voltage signal produced by the knock sensor
increases with the amplitude of vibration. The PCM
receives as an input the knock sensor voltage signal.
If the signal rises above a predetermined level, the
PCM will store that value in memory and retard
ignition timing to reduce engine knock. If the knock
sensor voltage exceeds a preset value, the PCM
retards ignition timing for all cylinders. It is not a
selective cylinder retard.
The PCM ignores knock sensor input during engine
idle conditions. Once the engine speed exceeds a
specified value, knock retard is allowed.
Knock retard uses its own short term and long
term memory program.
Long term memory stores previous detonation
information in its battery-backed RAM. The maxi-
mum authority that long term memory has over tim-
ing retard can be calibrated.
Short term memory is allowed to retard timing up
to a preset amount under all operating conditions (as
long as rpm is above the minimum rpm) except WOT.
The PCM, using short term memory, can respond
quickly to retard timing when engine knock is
detected. Short term memory is lost any time the
ignition key is turned off.
NOTE: Over or under tightening affects knock sen-
sor performance, possibly causing improper spark
control.
Fig. 15 RUBBER INSULATORS AND COIL
1 - Rubber Insulators
2 - Coil
8I - 8
IGNITION CONTROL
PL/SRT-4
IGNITION COIL (Continued)
REMOVAL
REMOVAL - 1.6L
(1) Disconnect the negative battery cable.
(2) Remove the fuel rail cover (Fig. 16).
(3) Locate the electrical connector (Fig. 17).
(4) Disconnect the electrical connector (Fig. 18).
(5) Remove the bolt holding the sensor (Fig. 19).
(6) Remove the sensor (Fig. 20).
Fig. 16 FUEL RAIL COVER
Fig. 17 CONNECTOR LOCATION
Fig. 18 ELECTRICAL CONNECTOR
Fig. 19 KNOCK SENSOR
PL/SRT-4
IGNITION CONTROL
8I - 9
KNOCK SENSOR (Continued)
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