Operation; Removal; Installation; Engine Speed Sensor - Chrysler Concorde 2004 Service Manual

LH
CRANKSHAFT POSITION SENSOR (Continued)

OPERATION

Engine speed and crankshaft position are provided
through the crankshaft position sensor. The sensor
generates pulses that are the input sent to the pow-
ertrain control module (PCM). The PCM interprets
the sensor input to determine the crankshaft posi-
tion. The PCM then uses this position, along with
other inputs, to determine injector sequence and igni-
tion timing.
The crankshaft position sensor detects slots cut
into the transmission driveplate extension. There are
3 sets of slots. Two sets contain 4 slots and one set
contains 5 slots, for a total of 13 slots (Fig. 6). Basic
timing is set by the position of the last slot in each
group. Once the Powertrain Control Module (PCM)
senses the last slot, it determines which piston will
be next at TDC from the camshaft position sensor
input. It may take the PCM one engine revolution to
determine crankshaft position.
Fig. 6 TIMING SLOTS
1 - TORQUE CONVERTER DRIVE PLATE
2 - SLOTS
The PCM uses crankshaft position reference to
determine injector sequence and ignition timing.
Once the PCM determines crankshaft position, it
begins energizing the injectors and coils in sequence.
The PCM uses the Crankshaft Position sensor to
calculate the following:
• Engine rpm
• TDC number 1 and 4
• Ignition coil synchronization
• Injector synchronization
• Camshaft-to-crankshaft misalignment (Timing
belt skipped 1 tooth or more diagnostic trouble code)

REMOVAL

The crankshaft sensor is located on the passengers
side of the transmission housing, above the differen-
tial housing. The bottom of the sensor sits above the
drive plate.
(1) Disconnect electrical connector from crankshaft
position sensor.
(2) Remove sensor mounting screw. Remove sensor.

INSTALLATION

The crankshaft sensor is located on the passengers
side of the transmission housing, above the differen-
tial housing. The bottom of the sensor sits above the
drive plate.
(1) Install sensor and push sensor down until con-
tact is made with the transmission case. While hold-
ing the sensor in this position, install and tighten the
retaining bolt to 12 N·m (105 in. lbs.) torque.
(2) Connect electrical connector to crankshaft posi-
tion sensor.

ENGINE SPEED SENSOR

DESCRIPTION

The PCM receives a signal from the TCM and the
transaxle output speed sensor over the bus communi-
cation line to indicate vehicle speed on automatic
transmission cars. On Manual transmission cars (if
equipped) vehicle, a dedicated vehicle speed sensor is
connected to the PCM.
OPERATION
The Transmission Control Module (TCM) supplies
the road speed and distance traveled inputs to the
PCM. From these inputs and the throttle position
sensor input, the PCM determines when a decelera-
tion condition occurs.

FUEL INJECTOR

DESCRIPTION
The injectors are positioned in the cylinder heads
with the nozzle ends directly above the intake valve
port (Fig. 8). The fuel injectors are electrical sole-
noids (Fig. 7).
OPERATION
The fuel injectors are 12 volt electrical solenoids
(Fig. 9). The injector contains a pintle that closes off
an orifice at the nozzle end. When electric current is
supplied to the injector, the armature and needle
move a short distance against a spring, allowing fuel
to flow out the orifice. Because the fuel is under high
pressure, a fine spray is developed in the shape of a
hollow cone or two streams. The spraying action
atomizes the fuel, adding it to the air entering the
FUEL INJECTION 14 - 23