Removal Removal - 1.6L; Removal - 2.0/2.4L; Installation Installation - 1.6L; Installation - 2.0/2.4L - Chrysler PT Cruiser Service & Repair Manual

8I - 12 IGNITION CONTROL
KNOCK SENSOR (Continued)
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.
REMOVAL
REMOVAL - 1.6L
(1) Remove air cleaner assembly cover.
(2) Disconnect the negative battery cable.
(3) Disconnect the electrical connector for the sen-
sor (Fig. 27) (Fig. 28).
Fig. 27 WIRING CONNECTOR
(4) Remove knock sensor. The knock sensor is
located under the intake manifold (Fig. 28).

REMOVAL - 2.0/2.4L

The knock sensor bolts into the side of the cylinder
block in front of the starter under the intake mani-
fold.
(1) Disconnect the negative battery cable.
Fig. 28 KNOCK SENSOR
(2) Disconnect electrical connector from knock sen-
sor.
(3) Remove the bolt holding the knock sensor
(4) Remove the knock sensor
INSTALLATION
INSTALLATION - 1.6L
(1) Install the knock sensor (Fig. 28) Tighten
knock sensor bolt to 22 N·m (195 in. lbs.) torque.
Over or under tightening effects knock sensor
performance resulting in possible improper
spark control..
(2) Connect the electrical connector for the sensor
(Fig. 27).
(3) Connect the negative battery cable.
(4) Install air cleaner assembly cover.

INSTALLATION - 2.0/2.4L

The knock sensor bolts into the side of the cylinder
block in front of the starter under the intake mani-
fold.
(1) Install knock sensor. Tighten knock sensor bolt
to 22 N·m (195 in. lbs.) torque. Over or under
tightening effects knock sensor performance,
possibly causing improper spark control.
(2) Attach electrical connector to knock sensor.
(3) Connect the negative battery cable.
PT