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SENSOR RETURN—PCM INPUT
The sensor return circuit provides a low electrical
noise ground reference for all of the systems sensors.
The sensor return circuit connects to internal ground
circuits within the powertrain control module.
SPEED CONTROL—PCM INPUT
The speed control system provides five separate
voltages (inputs) to the Powertrain Control Module
(PCM). The voltages correspond to the ON/OFF, SET,
RESUME and CANCEL.
The speed control ON voltage informs the PCM
that the speed control system has been activated.
The speed control SET voltage informs the PCM that
a fixed vehicle speed has been selected. The speed
control RESUME voltage indicates the previous fixed
speed is requested. The speed control CANCEL volt-
age tells the PCM to deactivate but retain set speed
in memory (same as depressing the brake pedal). The
speed control OFF voltage tells the PCM that the
speed control system has deactivated. Refer to Group
8H for more speed control information.
SCI RECEIVE—PCM INPUT
SCI Receive is the serial data communication
receive circuit for the DRB scan tool. The Powertrain
Control Module (PCM) receives data from the DRB
through the SCI Receive circuit.
TRANSAXLE PARK/NEUTRAL SWITCH—PCM INPUT
The park/neutral switch is located on the transaxle
housing (Fig. 17). It provides an input to the PCM
indicating whether the automatic transaxle is in
Park or Neutral. This input is used to determine idle
speed (varying with gear selection) and ignition tim-
ing advance. The park neutral switch is sometimes
referred to as the neutral safety switch.
THROTTLE POSITION SENSOR—PCM INPUT
The throttle position sensor mounts to the side of
the throttle body (Fig. 18) or (Fig. 19).
The Throttle Position Sensor (TPS) connects to the
throttle blade shaft. The TPS is a variable resistor
that provides the PCM with an input signal (voltage).
The signal represents throttle blade position. As the
position of the throttle blade changes, the resistance
of the TPS changes.
The PCM supplies approximately 5 volts DC to the
TPS. The TPS output voltage (input signal to the
PCM) represents throttle blade position. The TPS
output voltage to the PCM varies from approximately
0.5 volt at minimum throttle opening (idle) to a max-
imum of 3.7 volts at wide open throttle.
Along with inputs from other sensors, the PCM
uses TPS input to determine current engine operat-
ing conditions. The PCM also adjusts fuel injector
pulse width and ignition timing based on these
inputs.
Fig. 17 Park Neutral Switch—4-Speed Electronic
Automatic Transaxle—Typical
OUTPUT
SPEED
SENSOR
PARK/NEUTRAL
SWITCH (BLACK)
TRANSMISSION
RANGE SWITCH
Fig. 18 Throttle Position Sensor—2.0/2.4L Engines
TROL MOTOR
Fig. 19 Throttle Position Sensor—2.5L Engine
14 - 34
FUEL SYSTEM
JX
DESCRIPTION AND OPERATION (Continued)
Summary of Contents for 1997 Stratus Convertible LHD
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