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8I - 4
IGNITION CONTROL
CAMSHAFT POSITION SENSOR (Continued)
REMOVAL - 2.7L
The camshaft position sensor is mounted in the
front of the head.
(1) Disconnect electrical connector from sensor.
(2) Remove camshaft position sensor screw.
(3) Without pulling on the connector, pull the sen-
sor out of the chain case cover (Fig. 3).
Fig. 3 CAM SENSOR LOCATION 2.7L
INSTALLATION
INSTALLATION - 4 CYLINDER
The target magnet has locating dowels that fit into
machined locating holes in the end of the camshaft
(Fig. 4).
(1) Install target magnet in end of camshaft.
Tighten mounting screw to 3 N·m (30 in. lbs.) torque.
Over torqueing could cause cracks in magnet. If mag-
net cracks replace it.
(2) Install camshaft position sensor. Tighten sensor
mounting screws to 12.9 N·m (115 in. lbs.) torque.
(3) Carefully attach electrical connector to cam-
shaft position sensor. Installation at an angle may
damage the sensor pins.
(4) Connect the PCV Valve hose.
(5) Connect the negative battery cable.
INSTALLATION - 2.7L
The camshaft position sensor is mounted in the
front of the head.
(1) Install sensor in the chain case cover and push
sensor in until contact is made with the boss on the
head. While holding the sensor in this position,
Fig. 4 Target Magnet Installation
1 - LOCATING DOWELS
2 - LOCATING HOLES (2)
install and tighten the retaining bolt to 12 N·m (105
in. lbs.) torque.
(2) Attach electrical connector to sensor.
IGNITION COIL
DESCRIPTION
The ignition coil assembly for the 4 cylinder
engines consists of 2 independent coils molded
together. The coil assembly for the 4 cylinder engines
is mounted on the cylinder head cover. Spark plug
cables route to each cylinder from the coil. The coil
assemblies for the 2.7L are mounted on the head
cover. It is a coil on plug assembly and each cylinder
has an ignition coil assembly.
OPERATION
The coil for the 4 cylinder engines fires two spark
plugs every power stroke. One plug is the cylinder
under compression, the other cylinder fires on the
exhaust stroke. The Powertrain Control Module
(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 ignition
coil. When the PCM breaks the contact, the magnetic
energy in the coil 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.
JR
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