Installation - 2.4L Turbo; Ignition Coil Capacitor; Removal - 2.4L Turbo; Knock Sensor Description - Chrysler PT Cruiser Service & Repair Manual

PT
IGNITION COIL (Continued)
Fig. 25 UPPER INTAKE GASKET INPLACE
(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) Install the negative battery cable.

INSTALLATION - 2.4L TURBO

(1) Install the coil on throttle body side of the
intake manifold (Fig. 22), rotate down past the throt-
tle body to the valve cover (Fig. 21).
(2) Connect and lock the electrical connector to the
ignition coil.
(3) Install bolts to ignition coil. Twist coil to install
2 of the bolts (Fig. 20) to the coil after installing it to
vehicle.
(4) Install the spark plug cables to the ignition
coil.
(5) Install the throttle cable bracket (Fig. 19).
(6) Install the throttle cables to the throttle body
lever (Fig. 18).
(7) Install the throttle control shield (Fig. 17).
(8) Connect the negative battery cable.
NOTE: Check and make sure that throttle body and
attachments will not contact ignition cables.

IGNITION COIL CAPACITOR

REMOVAL - 2.4L TURBO

(1) Disconnect the negative battery cable.
(2) Remove the electrical connector from the igni-
tion coil capacitor (Fig. 26).
(3) Remove mounting bolt and remove capacitor
(Fig. 26).
IGNITION CONTROL
Fig. 26 COIL CAPACITOR - 2.4L TURBO
INSTALLATION - 2.4L TURBO
(1) Install coil capacitor and mounting bolt and
tighten to 11.8 N·m (105 in. lbs.).
(2) Connect the electrical connector.
(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.
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