Chrysler neon 1997 Service Manual page 1322

CONTROL IDLE MOTOR EGR TRANSDUCER AIR SERVICE PORT CAM SENSOR EGR VALVE
PL
DESCRIPTION AND OPERATION (Continued)
Fig. 23 Electric EGR Backpressure Transducer—
The adjustments are based on inputs the PCM
receives. The inputs are from the throttle position
sensor, crankshaft position sensor, coolant tempera-
ture sensor, MAP sensor, vehicle speed sensor and
various switch operations (brake, park/neutral, air
conditioning).
Fig. 24 Idle Air Control Motor Air Bypass Passage—
DATA LINK CONNECTOR
The data link connector (diagnostic connector)
links the DRB scan tool with the powertrain control
module (PCM). Refer to On-Board Diagnostics in the
General Diagnosis section of this group. The data
link connector is located inside the vehicle, under the
instrument panel, left of the steering column (Fig.
25).
Typical
Typical
FRESH AIR OPENING
FUEL INJECTORS—PCM OUTPUT
The 2.0L engine uses electrically operated top feed
fuel injectors (Fig. 26). The Automatic Shutdown
(ASD) relay supplies battery voltage to the fuel injec-
tors. The PCM controls the ground path for each
injector in sequence. By switching the ground paths
on and off, the PCM fine-tunes injector pulse width.
Injector pulse width refers to the amount of time an
injector operates.
The PCM determines injector synchronization from
the camshaft position sensor and crankshaft position
sensor inputs. The PCM grounds the ASD and fuel
pump relays after receiving the camshaft position
sensor and crankshaft position sensor inputs.
The PCM energizes the injectors in a sequential
order during all engine operating conditions except TOP (FUEL ENTRY)
start-up. For the first injector pulse width during
start-up, all injectors are energized at the same time.
Once the PCM determines crankshaft position, it
begins energizing the injectors in sequence.
DATA LINK CONNECTOR
FUEL SYSTEM
Fig. 25 Data Link Connector
FUEL INJECTOR
Fig. 26 Fuel Injector
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NOZZLE