Chrysler PT Cruiser. Manual — part 494
AUTO SHUT DOWN RELAY
DESCRIPTION
The relay is located in the Power Distribution Cen-
ter (PDC). For the location of the relay within the
PDC, refer to the PDC cover for location. Check elec-
trical terminals for corrosion and repair as necessary
OPERATION
The
engine
switched
battery
(NGC
vehicles)
informs the PCM when the ASD relay energizes. A 12
volt signal at this input indicates to the PCM that
the ASD has been activated. This input is also used
to power certain drivers on NGC vehicles.
When energized, the ASD relay on NGC vehicles
provides power to operate the injectors, ignition coil,
generator field, O2 sensor heaters (both upstream
and downstream), evaporative purge solenoid, EGR
solenoid
(if
equipped)
wastegate
solenoid
(if
equipped), and NVLD solenoid (if equipped).
The ASD relay also provides a sense circuit to the
PCM for diagnostic purposes. If the PCM does not
receive 12 volts from this input after grounding the
control side of the ASD relay, it sets a Diagnostic
Trouble Code (DTC). The PCM energizes the ASD
any time there is an engine speed that exceeds a pre-
determined value (typically about 50 rpm). The ASD
relay can also be energized after the engine has been
turned off to perform an O2 sensor heater test, if
vehicle is equipped with OBD II diagnostics.
As mentioned earlier, the PCM energizes the ASD
relay during an O2 sensor heater test. On NGC vehi-
cles it checks the O2 heater upon vehicle start. The
PCM still operates internally to perform several
checks, including monitoring the O2 sensor heaters.
CAMSHAFT POSITION
SENSOR
DESCRIPTION
On 2.0/2.4L engines the camshaft position sensor is
mounted to the rear of the cylinder head (Fig. 1),
(Fig. 2),.
OPERATION
The PCM sends approximately 5 volts to the Hall-
effect sensor. This voltage is required to operate the
Hall-effect chip and the electronics inside the sensor.
The input to the PCM occurs on a 5 volt output ref-
erence circuit. A ground for the sensor is provided
through the sensor return circuit. The PCM identifies
camshaft position by registering the change from 5 to
0 volts, as signaled from the Camshaft Position sen-
sor (Fig. 3).
On 2.0/2.4L engines a target magnet attaches to
the rear of the camshaft and indexes to the correct
position. The target magnet has fourteen different
poles arranged in an asymmetrical pattern. As the
target magnet rotates, the camshaft position sensor
senses the change in polarity (Fig. 4).
The PCM determines fuel injection synchronization
and cylinder identification from inputs provided by
the camshaft position sensor (Fig. 1) and crankshaft
position sensor. From the two inputs, the PCM deter-
mines crankshaft position.
Fig. 1 Camshaft Position Sensor -2.0/2.4L DOHC
1 - PCV VALVE
2 - EGR VALVE
3 - CAMSHAFT POSITION SENSOR
Fig. 2 CAMSHAFT POSITION SENSOR - 2.4L TURBO
8I - 4
IGNITION CONTROL
PT
The sensor input switches from high (5 volts) to
low (0.30 volts) as the target magnet rotates. When
the north pole of the target magnet passes under the
sensor, the output switches high. The sensor output
switches low when the south pole of the target mag-
net passes underneath.
REMOVAL
REMOVAL - 2.0/2.4L
(1) Remove the air cleaner lid, disconnect the inlet
air temperature sensor and makeup air hose.
(2) Remove the negative battery cable.
(3) Disconnect electrical connector from camshaft
position sensor.
(4) Remove camshaft position sensor mounting
screws. Remove sensor.
(5) Loosen screw attaching target magnet to rear
of camshaft (Fig. 5).
REMOVAL - 1.6L
(1) Disconnect the negative battery cable.
(2) Relocate the power steering return hose.
(3) Disconnect the electrical connector from the
camshaft sensor.
(4) Remove 1 screws from sensor.
(5) Remove sensor (Fig. 6).
Fig. 3 Target Magnet - Typical
1 - CAM MAGNET/TARGET
2 - CAMSHAFT POSITION SENSOR
Fig. 4 Target Magnet Polarity - NGC
1 - TARGET MAGNET
Fig. 5 Target Magnet Removal/Installation
1 - CAM MAGNET/TARGET
2 - CAMSHAFT POSITION SENSOR
PT
IGNITION CONTROL
8I - 5
CAMSHAFT POSITION SENSOR (Continued)
INSTALLATION
INSTALLATION - 2.0/2.4L
The target magnet has locating dowels that fit into
machined locating holes in the end of the camshaft
(Fig. 7).
(1) Install target magnet in end of camshaft.
Tighten mounting screw to 3.6 N·m (32 ±5 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 ±15 in. lbs.) torque.
(3) Carefully attach electrical connector to cam-
shaft position sensor. Installation at an angle may
damage the sensor pins.
(4) Install the negative battery cable.
(5) Install the air cleaner lid, connect the inlet air
temperature sensor and makeup air hose.
INSTALLATION - 1.6L
(1) Install sensor to cylinder head (Fig. 6).
(2) Tighten screws to 9 N·m (80 in. lbs.).
(3) Connect the electrical connector to the sensor.
(4) Relocate the power steering return line.
(5) Connect the negative battery cable
IGNITION COIL
DESCRIPTION
WARNING: THE DIRECT IGNITION SYSTEM GENER-
ATES APPROXIMATELY 40,000 VOLTS. PERSONAL
INJURY COULD RESULT FROM CONTACT WITH
THIS SYSTEM.
The coil pack consists of 2 coils molded together.
The coil pack is mounted on the valve cover (Fig. 8)
or (Fig. 9).
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
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.
Fig. 6 CAMSHAFT SENSOR LOCATION
Fig. 7 Target Magnet Installation
1 - LOCATING DOWELS
2 - LOCATING HOLES (2)
Fig. 8 Ignition Coil Pack—2.0/2.4L
8I - 6
IGNITION CONTROL
PT
CAMSHAFT POSITION SENSOR (Continued)
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.
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.
(1) Remove air cleaner assembly cover and discon-
nect the inlet air temperature sensor (Fig. 10).
(2) Disconnect the negative battery cable.
(3) Disconnect the electrical connector at the throt-
tle body.
(4) Remove the purge hose from throttle body.
(5) Remove the 4 bolts from the upper to lower
manifold (Fig. 11).
Fig. 9 IGNITION COIL LOCATION - 2.4L TURBO
Fig. 10 INLET AIR TEMP. SENSOR
Fig. 11 UPPER MANIFOLD BOLTS
PT
IGNITION CONTROL
8I - 7
IGNITION COIL (Continued)
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