Chrysler Concorde 1993, Руководство по обслуживанию, Страница: 521 / 820

The PCM supplies approximately 5 volts to the
TPS. The TPS output voltage (input signal to the
powertrain control module) represents throttle blade
position. The TPS output voltage to the PCM varies
from approximately 0.6 volt at minimum throttle
opening (idle) to a maximum of 4.5 volts at wide
open throttle.
Along with inputs from other sensors, the PCM
uses the TPS input to determine current engine op-
erating conditions. The PCM also adjusts fuel injec-
tor pulse width and ignition timing based on these
inputs.
AIR CONDITIONING COMPRESSOR CLUTCH
RELAY—PCM OUTPUT
The powertrain control module (PCM) operates the
air conditioning clutch relay ground circuit. The bat-
tery supplies power to the solenoid side of the relay.
The PCM grounds the relay when the operator puts
the A/C or defrost switch in the ON position and it
receives an acceptable input from the A/C pressure
transducer. If the A/C pressure transducer input in-
dicates high side pressure is too high or too low, the
PCM will not ground the A/C compressor clutch re-
lay.
With the engine operating, the PCM cycles the air
conditioning clutch on and off during A/C operation.
When the PCM senses low idle speeds or wide open
throttle through the throttle position sensor, it de-en-
ergizes the A/C compressor clutch relay.
The A/C compressor clutch relay is located in the
power distribution center (PDC) near the battery
(Fig. 21). A decal on the inside of the PDC covers
shows the locations of each relay and fuse contained
in the PDC.
AUTO SHUTDOWN AND FUEL PUMP
RELAYS—PCM OUTPUT
The PCM operates the auto shutdown (ASD) relay
and fuel pump relay through one ground path. The
PCM operates them by switching the ground path for
the solenoid side of the relays on and off. Both relays
turn on and off at the same time.
The ASD relay connects battery voltage to the fuel
injectors and ignition coil. The fuel pump relay con-
nects battery voltage to the fuel pump.
The PCM turns the ground path off when the igni-
tion switch is in the Off position. Both relays are off.
When the ignition switch is in the On or Crank po-
sition, the PCM monitors the crankshaft position
sensor and camshaft position sensor signals to deter-
mine engine speed and ignition timing (coil dwell). If
the PCM does not receive a crankshaft position sen-
sor signal and camshaft position sensor signal when
the ignition switch is in the Run position, it de-ener-
gizes both relays. When the relays are de-energized,
battery voltage is not supplied to the fuel injectors,
ignition coil and fuel pump.
The ASD relay and fuel pump relay are located in
the power distribution center (PDC) near the battery
(Fig. 21). A decal on the inside of the PDC covers
shows the locations of each relay and fuse contained
in the PDC.
DATA LINK CONNECTOR—PCM OUTPUT
The data link connector (diagnostic connector)
links the DRBII scan tool with the powertrain con-
trol module (PCM). Refer to On-Board Diagnostics in
the General Diagnosis section of this group. The data
link connector is located inside the vehicle, below in-
strument panel next to the center column (Fig. 22).
MANIFOLD TUNING VALVE (MTV) SOLENOID
(3.5L)—PCM OUTPUT
The MTV solenoid regulates the supply of vacuum
to the manifold tuning valve. The PCM controls the
MTV solenoid. The manifold tuning valve optimizes
acoustical tuning of the intake system during wide
open throttle operation throughout the RPM range.
The valve opens a crossover passage in that connects
both sides of the intake manifold plenum.
Fig. 21 Power Distribution Center
Fig. 22 Data Link Connector
14 - 28 FUEL SYSTEMS