Chrysler neon 1997 Service Manual page 998

PL
DESCRIPTION AND OPERATION (Continued)
is a variable resistor. As coolant temperature
changes, the resistance in the sensor changes causing
a change in current draw. The K2 circuit connects to
cavity 26 of the PCM connector.
The PCM provides ground for the engine coolant
temperature sensor signal (circuit K2) through circuit
K4. Circuit K4 connects to cavity 43 of the PCM con-
nector.
HELPFUL INFORMATION
The engine coolant temperature sensor is case
grounded. The case ground provides the ground for
the coolant temperature gauge circuit G20.
Circuit K4 splices to supply ground for the signals
from the following:
• Upstream heated oxygen sensor
• Downstream heated oxygen sensor
• Camshaft position sensor
• Crankshaft position sensor
• Battery temperature sensor
• Throttle position sensor
• Manifold absolute pressure sensor
• Knock sensor
• Intake air temperature sensor
• Vehicle speed sensor
THROTTLE POSITION SENSOR
From the Powertrain Control Module (PCM), cir-
cuit K6 supplies 5 volts to the Throttle Position Sen-
sor (TPS). Circuit K6 connects to cavity 61 of the
PCM connector.
Circuit K22 delivers the TPS signal to the PCM.
Circuit K22 connects to cavity 35 of the PCM connec-
tor.
The PCM provides ground for the TPS signal (cir-
cuit K22) through circuit K4. Circuit K4 connects to
cavity 43 of the PCM connector.
HELPFUL INFORMATION
Refer to Group 14 for TPS operation.
Circuit K6 splices to supply 5 volts to the Manifold
Absolute Pressure (MAP) sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Upstream heated oxygen sensor
• Downstream heated oxygen sensor
• Battery temperature sensor
• Camshaft position sensor
• Crankshaft position sensor
• Engine coolant temperature sensor
• Manifold absolute pressure sensor
• Knock sensor
• Intake air temperature sensor
• Vehicle speed sensor
8W - 30 FUEL/IGNITION SYSTEMS
MANIFOLD ABSOLUTE PRESSURE SENSOR
From the Powertrain Control Module (PCM), cir-
cuit K6 supplies 5 volts to the Manifold Absolute
Pressure (MAP) sensor. Circuit K6 connects to cavity
61 of the PCM connector.
Circuit K1 delivers the MAP signal to the PCM.
Circuit K1 connects to cavity 36 of the PCM connec-
tor.
The PCM provides ground for the MAP sensor sig-
nal (circuit K1) through circuit K4. Circuit K4 con-
nects to cavity 43 of the PCM connector.
HELPFUL INFORMATION
Refer to Group 14 for MAP sensor operation.
Circuit K6 splices to supply 5 volts to the Throttle
Position Sensor.
Circuit K4 splices to supply ground for the signals
from the following:
• Upstream heated oxygen sensor
• Downstream heated oxygen sensor
• Battery temperature sensor
• Camshaft position sensor
• Crankshaft position sensor
• Engine coolant temperature sensor
• Throttle position sensor
• Knock sensor
• Intake air temperature sensor
• Vehicle speed sensor
INTAKE AIR TEMPERATURE SENSOR
The intake air temperature sensor provides an
input to the Powertrain Control Module (PCM) on
circuit K21. Circuit K21 connects to cavity 37 of the
PCM connector.
From circuit K21 the intake air temperature sen-
sor draws voltage from the PCM. The sensor is a
variable resistor. As intake air temperature changes,
the resistance in the sensor changes causing a
change in current draw.
The PCM provides ground for the intake air tem-
perature sensor signal (circuit K21) through circuit
K4. Circuit K4 connects to cavity 43 of the PCM con-
nector.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
• Upstream heated oxygen sensor
• Downstream heated oxygen sensor
• Battery temperature sensor
• Camshaft position sensor
• Crankshaft position sensor
• Engine coolant temperature sensor
• Throttle position sensor
• Knock sensor
• Manifold absolute pressure sensor
• Vehicle speed sensor
8W - 30 - 17